Boost History

Version 1.82.0

Fri, 14 Apr 2023 03:08:20 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release.

Filesystem
- Compilation on OpenBSD may fail because of broken support for -Wl,--no-undefined compiler flag for shared libraries on this platform, see #283. Patch.
- On Windows, creating directory iterators over directories in SMBv1 shares may fail with ERROR_INVALID_LEVEL error code, see #284. Patch.

Notice of Dropping C++03 Support

The following libraries will be dropping C++03 support in release 1.84, two releases from now:

Align
Any
Asio
Atomic
Bind
Chrono
ContainerHash
Conversion
DLL
Endian
Filesystem
Function
Functional
Io
LexicalCast
Log
Random
Ratio
SmartPtr
System
Stacktrace
Thread
Timer
TypeIndex
Typeof
Unordered
Variant

This release (1.82) and the next (1.83) will be the last releases offering C++03 support for the above libraries and most of their dependencies.

The new baseline requirement for the above libraries, and for most of Boost, will be C++11. Since old compiler versions often implement C++11 only partially, due to missing support or bugs, what compilers are considered to meet the C++11 requirement may vary by library.

However, a general rule is that if a compiler does not recognize a C++11 keyword or syntax at all (e.g. use of noexcept, use of constexpr, or defining a =deleted function results in an immediate compile error), or if a compiler does not provide a required C++11 header at all (e.g. trying to include <atomic> or <chrono> fails), or the compiler provides a C++11 feature or a header that is completely unusable, this compiler is not considered a C++11 compiler.

This rules out, for instance, Microsoft Visual C++ before 14.0, or GCC before 4.8.

New Libraries

Mysql: a C++11 client for the MySQL database server, based on Boost.Asio, from Ruben Perez.

Updated Libraries

Any:
- Now uses core/enable_if.hpp header instead of the deprecated utility/enable_if.hpp. Thanks to Michael Ford for the PR PR#25.
Asio:
- Added the ability to customise the execution of a completion handler when an operation completes immediately.
- Added user-defined literals for buffer types.
- Added a new protocol type local::seq_packet_protocol to represent AF_UNIX with SOCK_SEQPACKET.
- Exposed sigaction() flags via an optional argument to signal_set::add.
- Change allocator_binder, executor_binder, and cancellation_slot_binder to support detection of unspecialised associators.
- Fixed ambiguity in associated_cancellation_slot<reference_wrapper>::get().
- Fixed awaitable<> handling for completion signatures containing std::exception_ptr.
- Fixed experimental::channel<> try_send failure after a cancel.
- Fixed thread_pool::join() deadlock when the pool has no internal threads.
- Fixed pipe release() when using io_uring.
- Fixed data initialisation and cleanup issues in the io_uring backend.
- Fixed a dangling reference issue in the execution context overload of get_associated_executor().
- Ensured buffered messages can still be received when an experimental::channel<> is closed.
- Fixed the any_completion_handler assignment operator.
- Constrained the constructor of any_completion_handler to prevent accidental copying
- Changed to use uint64_t for OpenSSL options, to match OpenSSL 3.
- Fixed deferred interoperability with multiple completion signatures.
- Fixed channels to add partial support for C++11 and C++14.
- Added missing handler tracking source location support to co_composed and 'awaitable<>' coroutines, when awaiting packaged asynchronous operations.
- Fixed some 'potential null dereference' and shadow variable warnings.
- Fixed a asio::buffer overload selection when used with const_buffers_1 and mutable_buffers_1.
- Disabled the runtime check for current Windows version unless targeting older Windows.
- Fixed compatibility between buffered stream wrappers and move-constructible streams, such as ssl::stream<>.
- Fixed basic_socket_acceptor::async_accept compatibility with lambdas that have a deduced return type.
- Fixed as_tuple compatibility with legacy completion tokens.
- Fixed redirect_error compatibility with new completion tokens.
- Fixed a potential, Windows-specific program termination due to exceptions that should have been allowed to escape from a destructor.
- Prevented inadvertent co_await of boolean expressions.
- Fixed result handling and support for custom allocators in experimental::use_coro.
- Fixed variadic template emulation for is_async_operation and completion_signature_of.
- Fixed incorrect reuse of a moved-from result in experimental::promise.
- Fixed experimental::coro use with custom allocators.
- Fixed seek_cur behaviour with stream-oriented files on Windows.
- Various additions and modifications to the documentation.
- Consult the Revision History for further details.
Atomic:
- When compiled for x86 targets supporting AVX, vector instructions are now used for 128-bit atomic loads and stores.
- For 32-bit x86 targets, 64-bit atomic loads and stores with memory_order_seq_cst semantics will now issue a memory ordering instruction.
- Removed atomic<T>::storage() accessors and atomic<T>::storage_type types that were deprecated in Boost.Atomic 1.73. Users are recommended to use atomic<T>::value() and atomic<T>::value_type instead.
Beast:
- Add error_codes use source_location
- tcp_stream uses the correct executor of the timer.
- error_categories use numeric ids
- file_body supports seek
ContainerHash:
- Added an overload of hash_value for std::nullptr_t.
- Added is_tuple_like and an overload of hash_value for tuple-like types.
- Changed string hashing to use mulxp1_hash. This improves both quality and speed.
Core:
- Added boost/core/snprintf.hpp header with portable definitions of snprintf, vsnprintf and their wchar_t counterparts.
- Deprecated boost/core/is_same.hpp and boost::core::is_same. The header will be removed in a future release. Users are advised to use Boost.TypeTraits or C++ standard library type traits instead.
- Marked boost::ref member functions and associated methods with noexcept.
- Marked boost::swap function with noexcept, depending on whether the type supports a non-throwing swap operation.
- Added boost::core::launder, a portable implementation of std::launder.
- Added BOOST_CORE_ALIGNOF, a portable implementation of alignof.
- Added boost::core::max_align_t, a portable equivalent of std::max_align_t, and boost::core::max_align, the alignment of max_align_t.
- Added boost::core::memory_resource, a portable equivalent of std::pmr::memory_resource from C++17.
- Added boost/core/serialization.hpp, a collection of primitives allowing libraries to implement Boost.Serialization support for their types without including a Serialization header and thereby making their libraries depend on Serialization.
- Added boost::data, an implementation of std::data.
- Added boost::size, an implementation of std::size.
- Updated boost::span to use boost::data which adds support for range construction from an std::initializer_list.
- Added boost::identity, an implementation of std::identity. This facility has been moved from Boost.Functional.
DLL:
- Avoid implicit cast from size_t to uint32_t, thanks to Travers Biddle for the PR PR#57.
Filesystem:
- Fixed compilation errors that could have been caused by path conversion constructors being too permissive on the accepted arguments. (#273)
- v4: path::remove_filename now presesrves the trailing directory separator. (#271)
- Added path::remove_filename_and_trailing_separators, which removes the filename and directory separators preceding it from the path. This behavior is similar to path::remove_filename in Filesystem v3, but is also usable in v4.
- Added path::replace_filename, which replaces filename in a path.
- Updated implementation of the library version selection to avoid ODR violations. (#279)
- On Windows, added a workaround for querying file attributes for files in SMBv1 shares. Previously, directories in SMBv1 shares could have been reported as regular files. This does not affect SMBv2 or later. (#282)
Geometry:
- Major improvements
  - PR#1045 Support geographic buffer for (multi)linestrings and (multi)polygons
- Improvements
  - PR#1114 Comparable distance: Add support for dynamic geometries
  - PR#1046 Support covered_by() for box, geometry combinations
- Solved issues
  - #705 WKT: allow tabs and new lines
  - #1109, #1108 Fixes for union
  - Various fixes in examples
- Breaking changes
  - The WKT output presentation of an empty polygon is now POLYGON() to make it consistent with other geometries
Histogram:
- Replace detail::span and detail::make_span with implementations in boost::core
- Documentation improvements
- Protect usage of std::min and std::max in some cases, contributed by Han Jiang (min,max macros are illegially set by popular Windows headers so we need to work around)
- Added test to catch usage of unprotected min,max tokens in the library in the future
- Fixes to support latest clang-14 and deduction guides in gcc-11+
JSON:
- set_at_pointer.
- boost::hash support.
- Caller-provided serializer storage.
- value_to supports missing elements for std::optional.
- Fix parser suspend inside an escape character.
- Make sentinel() return a unique pointer.
Locale:
- get_system_locale and dependents will now correctly favor LC_ALL over LC_CTYPE as defined by POSIX PR#144
- utf8_codecvt::out returns partial for trailing (UTF) surrogates
- Add boost::locale::util::locale_data to parse a locale
- boost::locale::info::encoding() result is now in uppercase as documented, e.g. "UTF-8" instead of "utf-8"
- Support M49 country codes such as en_001 or en_150 PR#148
- Treat en_US_POSIX as an alias for the C locale PR#148
- Improve error for missing segmentation support (i.e. without ICU) PR#149
- Fix compiler warnings
Math:
- Deprecated C++11 support: We now require C++14 as a minimum standard. Our minimum tested compiler versions are now Clang-5, GCC-5 or MSVC-14.1.
- Added Estrin's method for polynomial evaluation.
- Fix various issues in non-central distributions to allow for larger non-centralities see 939.
- Added CMake install target.
- Fix special_functions.hpp to disable anything which can't be used in an exception-free environment.
- Get condition number calculation working in C++14.
- Fix constexpr table driven functions to avoid massive slowdown when the code is not actually constexpr, see 923.
- Improve tanh_sinh boundary handling, see 894.
- Add Linux arm64, s390x and Apple M1 testing, fix up test cases to handle 128-bit long doubles.
- Improve constexpr math functions to better handle infinities and NaN's.
- Make the integrators const-correct.
- Fix tanh_sinh integrator in case the function underflows, see 898.
- Don't use std::cbrt as some platforms still don't support it.
- Stop non-central T from raising spurious FE_INVALID exceptions, see 892.
- Fix binomial distribution edge case.
- Improve ibeta handling of very small arguments, see 884.
- Improve ibeta handling of infinities and NaN's, see 878.
- Improve error handling in powm1, see 781.
- Improve root-finder bracketing to bracket faster when the exponent is super-large or small.
- Fix root finding edge cases, see 873.
- Lots of miscellaneous warning fixes.
- Add assertions when using features which require C++17 for better error messages when invoking the compiler in a lower std version.
Multi-index Containers:
- Serialization now uses unsigned long instead of collection_size_type, and multi_index_container serialization class version has been bumped from 2 to 3 to reflect this change. Reading old archives may fail for custom archive types giving special treatment to collection_size_type values: if this is the case, globally define the macro BOOST_MULTI_INDEX_ENABLE_SERIALIZATION_COMPATIBILITY_V2 to ensure backwards compatibility in reading operations.
- Maintenance work.
Multiprecision:
- Deprecated C++11 support: We now require C++14 as a minimum standard. Our minimum tested compiler versions are now Clang-5, GCC-5 or MSVC-14.1.
- Added a new forward declaration header.
- Update Eigen interoperability so we no longer rely on Eigen's details, see 479.
- Add Cmake install target.
- Fix cpp_dec_float construction from string in standalone case for better error handling, see 499.
- Remove redundent definitions when in C++17 mode, see 530.
- Fix the error handling in standalone itrunc and ltrunc.
- Fix potentially uninitialized storage when parsing octal strings.
- Add arm64 and s390x CI testing.
- Add some missing expression template unpacking code for powm, see 506.
Nowide:
- Add convert_string overload accepting a (std::)string instance
- Add quoted to output (quoted UTF-8) paths (std::filesystem or boost::filesystem) to streams PR#170
PFR:
- Implemented the boost::pfr::is_implicitly_reflectable and the machinery for specializing aggregates as reflectable or not, thanks to Denis Mikhailov for the PR PR#111.
- Implemented boost::pfr::get by type of an element in the aggregate.
- Implemented the BOOST_PFR_ENABLED macro to detect library support for reflection, thanks to Denis Mikhailov for the PR PR#86.
- Fixed missing terminating character, thanks to Denis Mikhailov for the PR PR#114.
- Fixed the boost/pfr/config.hpp compilation on older compilers, thanks to Denis Mikhailov for the PR PR#118.
- Workaround for broken C++17 stuctured binding in old compilers, thanks to Denis Mikhailov for the PR PR#119.
- Avoid -Wzero-as-null-pointer-constant warnings, thanks to Markus F.X.J. Oberhumer for the PR PR#117.
- Fixed multiple typos, thanks to Denis Mikhailov for the fixes.
- Added missing #pragma once, thanks to caozhanhao for the PR PR#121.
- Multiple fixes and improvements for the docs.
Process:
- Added management for extern processes to V2 (still experimental)
- Deprecated wait_for & wait_until in V1 - they will be removed in the future!
Stacktrace:
- Fixed typos in docs and comments, thanks to Chocobo1 for the PR PR#132.
- Fixed multithreading flag detection for backtrace_create_state if BOOST_STACKTRACE_BACKTRACE_FORCE_STATIC is defined.
StaticString:
- Boost.Core string_view and std::string_view interoperability
Test:
- Fixed several unused variable warnings
- Fixed sprintf deprecation warnings
- Fixed undefined behavior in basic_cstring::rfind
- Added CI through Github Actions
Unordered:
- Major update.
- Added node-based, open-addressing containers boost::unordered_node_map and boost::unordered_node_set.
- Extended heterogeneous lookup to more member functions as specified in P2363.
- Replaced the previous post-mixing process for open-addressing containers with a new algorithm based on extended multiplication by a constant.
- Fixed bug in internal emplace impl where stack-local types were not properly constructed using the allocator of the container which breaks uses-allocator construction.
URL:
- Add url::format with automatic percent-encoding
- URL router example
- set_params convenience function
- Support implicit conversions to string_view
- Parsing constructors are implicit
- string_token::arg has virtual destructor and slice protection
- Support BOOST_URL_DISABLE_THREADS
- Improvements and Bug fixes:
  - WIN32_LEAN_AND_MEAN macro redefinition warning
  - Comparison differentiates absent and empty components
  - Detect hier_part_rule with empty-port-like segments
  - Segments comparison as if normalized works above root
  - hier-part path-rootless considers invalid segments
  - port as number is set to 0 when it overflows
  - ipv4 to string overflow detection algorithm
Variant:
- Now uses core/addressof instead of the deprecated utility/addressof. Thanks to Michael Ford for the PR PR#105.

Updated Tools

Build:
- Includes release of B2 version 4.9.4.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang, C++03: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- GCC, C++03: 4.6.3, 11, 12
- GCC, C++11: 4.7.3, 4.8.5, 11, 12
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
OS X:
- Apple Clang, C++03: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2, 14.3

Acknowledgements

Marshall Clow and Glen Fernandes managed this release.

Version 1.81.0

Wed, 14 Dec 2022 17:44:48 +0000

New Libraries

URL: A library for parsing, modifying, and printing URLs using only C++11, from Vinnie Falco and Alan de Freitas. Features include fast compilation, strong invariants, and strict compliance using a memory-friendly approach.

Updated Libraries

Asio:
- Added the consign completion token adapter, which can be used to attach additional values to a completion handler.
- Added any_completion_handler<>, which can be used to type-erase completion handlers.
- Added experimental::co_composed to enable lightweight implementations of user-defined asynchronous operations using C++20 coroutines.
- Add range-based experimental::make_parallel_group() overloads.
- Added any_completion_executor, a type-erased wrapper for executors that are associated with completion handlers.
- Added missing context query to use_future's executor.
- Added nothrow constructor overloads to execution::any_executor<> and any_io_executor.
- Optimised representation of empty execution::any_executor objects to improve the performance of copy and move operations.
- Added an associated_cancellation_slot specialisation for std::reference_wrapper.
- Changed I/O objects to return their executors by const reference.
- Changed associated to use deduced return types for all two-argument get functions.
- Fixed spawn implementation to catch unhandled exceptions and rethrow them outside of the spawned "thread".
- Fixed spawn to ensure the completion handler is dispatched through the correct executor.
- Fixed cleanup of of terminal-state spawn "thread" objects.
- Fixed spawn and co_spawn implementations to dispatch cancellation handlers on the correct executor.
- Changed semantics of 'dispatch' to mean the executor is used as-is.
- Deprecated the execution::execute customisation point and sender/receiver facilities.
- Added a C++11 parallel_group example.
- Fixed example code to not use the deprecated resolve conversions.
- Fixed an ambiguity in experimental::channel_traits specialisations.
- Added a specialised channel implementation for the for R(error_code) signature.
- Made cancelled() public on the async_compose 'self' object.
- Added io_executor_type and get_io_executor to the async_compose 'self' object.
- Fixed implementation of release() for Windows overlapped handles.
- Enabled deferred awaiting for experimental::coro, regularised experimental::use_coro, and fixed allocator handling.
- Cleaned up experimental::promise and made it an asynchronous operation object.
- Constrained post/defer overloads on ability to require blocking.never.
- Changed descriptor implementation to fall back to fcntl if ioctl fails with ENOTTY when setting non-blocking mode.
- Fixed Xcode deprecation warnings related to use of sprintf.
- Fixed the arguments passed to select_reactor::run when it is run on an internal thread.
- Fixed compilation errors when BOOST_ASIO_DISABLE_SMALL_BLOCK_RECYCLING is defined.
- Updated detection of C++20 coroutine support on clang 14 and later.
- Changed standard library feature detection to always enable std::invoke_result when targeting C++17 or later.
- Fixed detection of return type deduction with MSVC.
- Updated the asynchronous operation requirements to relax the requirements on the associated executor.
- Added io_uring to the implementation notes.
- Consult the Revision History for further details.
Beast:
- Add buffers_generator
- Add beast::http::message_generator
- Added buffer_ref, so beast buffers can be used with asio.
- Support for per-operation cancellation
- C++20 awaitable examples.
- websocket per-message compression options
- websocket timeout option api
- multiple content length error
- Support for default-completion and rebind
Container Hash:
- Major update.
- The specializations of boost::hash have been removed; it now always calls hash_value.
- Support for BOOST_HASH_NO_EXTENSIONS has been removed. The extensions are always enabled.
- All standard containers are now supported. This includes std::forward_list and the unordered associative containers.
- User-defined containers (types that have begin() and end() member functions that return iterators) are now supported out of the box.
- Described structs and classes (those annotated with BOOST_DESCRIBE_STRUCT or BOOST_DESCRIBE_CLASS) are now supported out of the box.
- hash_combine has been improved.
- The performance (and quality, as a result of the above change) of string hashing has been improved. boost::hash for strings now passes SMHasher in 64 bit mode.
- The documentation has been substantially revised to reflect the changes.
Core:
- empty_value members are now marked as constexpr.
- Added fclose_deleter, a deleter that calls std::fclose on a pointer to std::FILE.
- Bit manipulation utilities in boost/core/bit.hpp now explicitly require unsigned integers on input. (#129)
- bit_width now returns int instead of a value of the input argument type. This follows resolution of LWG3656.
Describe:
- To allow the inclusion of enumerators.hpp, bases.hpp, and members.hpp when the option -pedantic is used, the invocation of BOOST_DESCRIBE_ENUM has been moved from modifiers.hpp into a separate header, modifier_description.hpp. As a consequence, modifiers.hpp no longer includes enum.hpp. Code that has been relying on this implicit inclusion may fail, and will need to be fixed to include enum.hpp.
DLL:
- Fixed path_from_handle implementation for Windows platforms, thanks to @SaltfishAmi for the bug report 57.
Filesystem:
- Deprecated: path construction, assignment and appending from containers of characters, such as std::vector<char> or std::list<wchar_t>, is deprecated in v3 and removed in v4. Please use string types or iterators instead.
- Deprecated: boost/filesystem/path_traits.hpp header is deprecated and will be removed in a future release. The header contained implementation details of path and should not be used in user's code.
- Previously deprecated APIs will now generate compilation warnings on use. To suppress these warnings, BOOST_FILESYSTEM_ALLOW_DEPRECATED macro can be defined when compiling user's code.
- Fixed compilation due to a missing include on POSIX systems that do not support *at APIs. (#250)
- On Windows prior to 10, added a workaround for network share filesystem that produces ERROR_INVALID_PARAMETER when constructing directory iterators. (PR#246, #245)
- On Windows, fixed weakly_canonical failing with an ERROR_INVALID_FUNCTION error code if the path started with the "\\?\" prefix. (#247)
- Added support for std::string_view, boost::string_view and boost::container::string (as well as respective wchar_t counterparts) in path constructors, assignment and appending operations. (#208)
- path constructors, assignment and appending operations taking a pair of iterators will no longer accept iterators with value types that are not one of the supported path character types.
- On Windows, improved compatibility of directory_iterator with various mounted filesystems and Wine releases prior to 7.21. (#255, #266)
- On Windows, deduplicated files are now reported as regular files rather than reparse files. (#262)
Fusion:
- Added fusion::identity_view (PR#240)
- Added support for associative sequences on fusion::transform_view (PR#239)
- Fixed compilation for the case when fusion::reverse_view used with an associative sequence (PR#237)
- Fixed Clang 13 -Wdeprecated-copy warnings (PR#261)
- A small dependency reorganization. Now boost::ref and boost::noncopyable are used from Boost.Core (PR#249)
- Added CI testing on Linux and MacOS for clang and gcc, fixed CI testing on Windows (PR#245, PR#236)
- Improved docs and fixed typos (#234, PR#235, PR#238)
Geometry:
- Solved issues
  - #1048 Index: Fix dangling references when Indexable is returned by value by IndexableGetter
  - #1076 Union: in rare cases it might miss one polygon
  - #1081 Union: due to precision it might miss interior rings
- Bugfixes
  - #1063 Intersection: fix a bug in intersection of simple spherical polygons
  - #1064 Formulas: fix a consistency issue in geodesic direct formulas
  - #1088 Point: Fix regression for custom point types
  - Various fixes for missing include files, warnings, C++20 compilation errors and documentation
Histogram:
- Major update.
- Added new accumulators::fraction to compute fractions, their variance, and confidence intervals
- Added interval computers for fractions: utility::clopper_pearson, utility::wilson_interval, utility::jeffreys_interval, utility::wald_interval which can compute intervals with arbitrary confidence level
- Added utility::confidence_level and utility::deviation types to pass confidence levels as probabilities or in multiples of standard deviation for all interval computers, respectively
- Fixed internal sub_array and span in C++20
Iterator:
- function_output_iterator now supports perfect forwarding of the assigned values to the wrapped function object. (PR#73)
- Fixed compilation of constructing a function_input_iterator from result of post-incrementing another function_input_iterator. (#75)
- The result of post-incrementing an iterator based on iterator_facade now supports operator->. (it++)->foo is equivalent to (*it++).foo, which was supported before.
JSON:
- Added object::stable_erase.
- Added parse overload for std::istream and operator>> for value.
- Added rvalue ref-qualified accessors for value.
- Conversion traits were redesigned.
- Added conversion support for described classes and enums, std::optional, std::variant, and null-like types (including std::nullptr_t, std::nullopt_t, and std::monotype).
- Added non-throwing conversion from value to user types.
LexicalCast:
- Fixed compilation while casting volatile arithmetic types. Thanks to Giovanni Cerretani for the bug report #50.
- Removed usage of deprecated headers. Thanks to Michael Ford for the PR PR#53.
Locale:
- Major update with some breaking changes.
- C++11 support is now required, support for C++03 and earlier is dropped
- Some enums have been converted to enum classes - Avoids name clashes
- Replace -sICU_LINK_LOCALE & -sICU_LINK by fine-grained configuration options as done in Boost.RegEx
- Fix detection of libiconv allowing Boost.Locale to be build (again) on some platforms
- Remove use of and support for std::auto_ptr
- Make the codecvt using wchar_t on Windows assume/use UTF-16 enconding
- Performance improvements: Make basic_format, date_time & hold_ptr movable, Fix use of format cache
- Make Boost.Locale compatible with more ICU versions (especially the tests)
- Fix RTTI definitions for some classes (visibility issues)
- Fix compatibility of the ICU backend with some libc++ versions
- Fix return value of some operators to correctly return non-const *this
- Fix int-overflow on negative roll of years in date_time
- Handle or suppress many warnings which makes the build log cleaner
- Add support for more Windows codepages
- Fix support for Windows codepages like ISO-2022-JP
Nowide:
- Fix build failure of tests on MSVC
Stacktrace:
- The library does not use COM initialization any more. Thanks to Alex Guteniev for the bug report, clarifications and PR PR#123!
- The library now may use BOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE macro value while detecting the libbacktrace availability in b2, thanks to Ben Gemmill for the bug report #115.
- Added BOOST_STACKTRACE_BACKTRACE_FORCE_STATIC macro to force a single backtrace_state static instance while using the libbacktrace. Thanks to the Rasmus Thomsen for the bug report #118!
- Avoid unresolved references when including only the boost/stacktrace/stacktrace.hpp header. Thanks to the Long Deng for the bug report #116.
- Optimized stacktrace printing by not calling strlen on Windows platforms. Thanks to Alex Guteniev for the bug report #122
PFR:
- Improved detection of aggregate initializables in C++14 mode, thanks to Denis Mikhailov for the PR PR#97.
- Suppress clang-tidy warnings, thanks to Alexander Malkov for the PRs PR#109, PR#104.
- Use fold expressions if they are supported by the compiler. Thanks to Jean-Michaël Celerier for the PR PR#96.
STLInterfaces:
- Fix two ill-formed iterator_interface operators in pre-C++20 iterators with a const value_type.
System:
- The macro BOOST_SYSTEM_DISABLE_THREADS can now be defined to disable the use of <mutex> (e.g. on single-threaded libstdc++).
- Added value_type, error_type, in_place_value, in_place_error to result<>.
- Added emplace to result<>.
Unordered:
- Major update.
- Added fast containers boost::unordered_flat_map and boost::unordered_flat_set based on open addressing.
- Added CTAD deduction guides for all containers.
- Added missing constructors as specified in LWG issue 2713.
Variant:
- Avoid recursive inclusion of headers, thanks to Nathan Sidwell for the bug report #101.
- Removed usage of deprecated headers, thanks to Michael Ford for the PR PR#96.
- Fixed compilation on clang in C++23 mode, thanks to Ed Catmur for the PR PR#98.
Variant2:
- Added support for boost::json::value_from and boost::json::value_to.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
- GCC: 4.6.3, 11, 12
- GCC, C++11: 4.7.3, 4.8.5, 11, 12
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
OS X:
- Apple Clang: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2, 14.3

Acknowledgements

Marshall Clow and Glen Fernandes managed this release.

Version 1.80.0

Wed, 10 Aug 2022 21:25:15 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release.

Config
- Support for libcpp15 which removes std::unary_function and std::binary_function. Patch.
Filesystem
- Directory iterators may fail to construct for a network share on Windows prior to 10, see PR#246 and #245. Patch.
- On Windows, weakly_canonical fails to process paths that start with the "\\?\" prefix, see #247. Patch.
- On POSIX systems that don't support *at APIs, compilation fails due to a missing include, see #250. Patch.
Unordered
- Containers are not in a valid state after moving, see #139. Patch.
- Fix MSVC /RTCc build runtime failures. Patch.

New Libraries

No new libraries.

Updated Libraries

Asio:
- Added a deduced trailing return type to all asynchronous operations, to enable the new form of async_result for C++11.
- Moved append, prepend, as_tuple, and deferred to the boost::asio namespace, and made them compatible with C++11.
- Made experimental::parallel_group compatible with C++11.
- Added buffer() overloads for contiguous containers, such as std::span.
- Added the ability for awaitable<>-based coroutines to directly co_await operations that are packaged as function objects.
- Changed spawn() to be a completion token-based asynchronous operation, and added support for cancellation. The basic_yield_context token now supports move-only and variadic result types. When targeting C++11 and later, spawn() and basic_yield_context are implemented in terms of Boost.Context directly.
- Added the is_async_operation trait and async_operation concept.
- Added the completion_signature_of trait.
- Added converting move construction/assignment to posix descriptors, serial ports, pipes, Windows object_handle, Windows stream handles, and Windows random-access handles.
- Added release() member functions to pipes, Windows stream handles, and Windows random-access handles.
- Enabled support for Endpoint implementations that return void pointers from their data() member functions, as per the documented Endpoint type requirements.
- Removed all() and race() from experimental::promise, as experimental::parallel_group covers this functionality.
- Added source locations to exceptions and error codes produced by the synchronous and asynchronous operations.
- Fixed compatibility with OpenSSL 3.0.4 and later.
- Fixed compatibility with with -masm=intel.
- Explicitly stated that socket shutdown() calls are thread-safe with respect to certain other synchronous operations on the same socket.
- Optimised the move construction of I/O objects where only the executor type differs.
- Fixed the detection of std::invoke_result for clang/libc++.
- Fixed an issue where experimental::parallel_group initiation incorrectly moved arguments instead of forwarding them.
- Fixed a sequencing issue in the implementation of post(), dispatch(), and defer().
- Fixed the awaitable<> implementation to propagate exceptions from awaited initiation functions through the current completion handler.
- Fixed detection of std::aligned_alloc with gcc 7.
- Changed to avoid using the soon-to-be-deprecated std::aligned_storage on newer compilers.
- Fixed detection of std::aligned_alloc for older Apple platforms.
- Removed faulty assertions from experimental::coro implementation.
- Added defence against Qt-defined macros when building with Intel C++.
- Changed the implementation of the select_reactor, on Windows, to ensure that any exception resulting from failure to recreate its interrupter's sockets will be allowed to propagate out through io_context::run().
- Fixed various compiler warnings.
- Updated all composed operations examples, and the C++11 timeouts example, to use the new async_result form.
- Added composed operation and coroutine examples for C++20.
- Consult the Revision History for further details.
Atomic:
- Improved portability of endianness checks on ARM, AArch32 and AArch64 targets. (#59)
- Fixed compilation with MSVC 14.0 (Visual Studio 2015) in C++17 mode. (#61)
Filesystem:
- On Windows, added a fallback implementation for querying file attributes in case if the file cannot be opened with ERROR_ACCESS_DENIED error. This may allow status and symlink_status to succeed for system files and directories that are not reparse points or symlinks. (#234)
- On Windows, added a workaround for FAT/exFAT filesystems that produce ERROR_INVALID_PARAMETER when querying file attributes. This affected status and symlink_status, which reported that files do not exist, and directory iterators, which failed to construct, as well as other dependent operations. (#236, #237)
- Worked around a compilation problem on RTEMS. (PR#240)
- On Linux, corrected switching to sendfile copy_file implementation if copy_file_range failed with ENOSYS in runtime. The sendfile fallback implementation used to skip the filesystem type check and could fail for some filesystems.
- On POSIX systems supporting openat and related APIs defined in POSIX.1-2008 and on Windows Vista and later, improved protection of remove_all against CVE-2022-21658 that was implemented in the previous release. The previous fix could still result in removing unintended files in certain conditions. Other systems remain vulnerable.
GIL: NOTICE: We are planning BREAKING switch to C++17 as minimum required C++ language version in one or two releases after Boost 1.80 (#676)
- Added
 - GSoC 2020: Added Perona-Malik anisotropic diffusion algorithm (PR#500)
 - GSoC 2020: Added histogram class and related functionality (PR#499)
 - GSoC 2020: Added histogram equalization feature (PR#514)
 - GSoC 2020: Added histogram matching algorithm (PR#515)
 - GSoC 2020: Added ability to stack images either horizontally (hstack) or vertically (vstack) (PR#506)
 - GSoC 2020: Added adaptive histogram equalization algorithm (PR#516)
 - GSoC 2020: Added Standard Hough Transform and circle rasterization (PR#512)
 - GSoC 2020: Added Bresenham's algorithm for line rasterization (PR#512)
 - GSoC 2021: Added rotation of image by arbitrary angle around its center (PR#565)
 - GSoC 2021: Added rasterization support for ellipse based on "An Efficient Ellipse-Drawing Algorithm" by Jerry Van Aken (PR#585)
 - Added image constructor from compatible view (PR#520)
 - Added inverse function for affine matrix3x2 (PR#527)
 - Added standard morphological transformations (PR#541)
 - Added for_each_pixel overload for any_image (PR#648)
 - Added C++17 polymorphic memory resource typedefs for image class (PR#529)
- Changed
 - BREAKING: The required minimum C++ version is changed from from C++11 to C++14. Currently, large parts of GIL still compile with a C++11 compiler. However, there is no guarantee that it stays that way, and any compilers that do not support at least C++14 are considered unsupported as of now.
 - BREAKING: any_color_converted_view() is deprecated and will be removed in the next release. Use color_converted_view() instead, which provides the same feature.
 - BREAKING: apply_operation for any_image is deprecated and will be removed in the next release. Use variant2::visit instead, which provides the same feature. (PR#656)
 - Moved numeric extension to core (PR#573)
 - Added support for C++17's <filesystem> (PR#636) The availability of the std::filesystem is detected automatically, unless the BOOST_GIL_IO_USE_BOOST_FILESYSTEM macro is defined that forces the preference of the Boost.Filesystem.
 - Renamed pixel_multiply_t to pixel_multiplies_t and pixel_divide_t to pixel_divides_t (PR#655)
 - Renamed io/dynamic_io_new.hpp to io/detail/dynamic.hpp (PR#653)
 - Moved function construct_matched into boost::gil::detail namespace as it was only used by other implementation details (PR#653)
 - Made packed_pixel trivially copyable and assignable (PR#679)
 - Replace deprecated libtiff v4.3 typedefs with C99 fixed-size integers (PR#685)
- Removed
 - BREAKING: Removed support for GCC 5 (PR#572)
 - Removed deprecated.hpp (PR#627)
- Fixed
 - Fixed conversion from RGB to HSL (PR#505)
 - Fixed conversion from RGB to signed CMYK (PR#522)
 - Removed unnecessary numeric cast in hsv.hpp (PR#530)
 - Fixed default constructor for homogeneous_color_base for reference pixel elements (PR#542)
 - Fixed returning reference to local temporary object in subchroma_image_view (PR#556)
 - Added missing header guards in diffusion.hpp (PR#568)
 - Fixed any_image_view<>::const_t (PR#526)
 - Fixed C++20 incompatibilities in I/O extensions (PR#617)
 - Ensured all examples build without errors (PR#628)
 - Fixed convolve_2d for images with float32_t channel model (PR#577)
 - Fixed for_each_pixel for non-1d iterable views (PR#621)
 - Fixed: is_equal_to_sixteen in PNG I/O was less-than test (PR#650)
 - Re-allow devicen_t with two components (PR#654) It was unintentionally removed in Boost 1.72
 - Fixed memory leak in image class for empty dimensions (PR#649)
- Acknowledgements
 - Cypre55, Samuel Debionne, Mike-Devel, Edward Diener, Peter Dimov, Omar Emara, Dhruva Gole, Nicolas Herry, Eugene K, Avinal Kumar, Gaurav Kumar, Marco Langer, Pranam Lashkari, Mateusz Łoskot, Giovanni Mascellani, Debabrata Mandal, Gopi Krishna Menon, René Ferdinand Rivera Morell, Felix Morgner, Harshit Pant, Paul92, André Schröder, Scramjet911, Siddharth, Dirk Stolle, Prathamesh Tagore, theroyn, Olzhas Zhumabek
Graph:
- Bug fixes:
 - Fix bug in stoer_wagner_min_cut where vertices are not merged at the end of each mincut phase (#286)
 - Fix conversion warning for return type of strong_components (#293)
 - Fix compilation failure of boykov_kolmogorov_max_flow named parameter overload (#232)
- General code improvements:
 - Remove redundant call to combine in astar_search_no_init_tree (#260)
 - Remove redundant child_idx argument of d_ary_heap_indirect<>::child (#261)
 - Improve documentation for traversal categories (#303)
- Acknowledgements
 - Viktor Pti, Sebastian Brockmeyer, Etienne dg
Histogram:
- Fixed segfault in indexed when trying to iterate over histogram with axes of zero size (physical or logical) under certain conditions
- Removed previously deprecated API
 - class accumulators::thread_safe: use accumulators::count<T, true>
 - Methods accumulators::sum::large and accumulators::sum::small: use accumulators::sum::large_part and accumulators::sum::small_part
 - Type alias algorithm::reduce_option: use algorithm::reduce_command
 - Template function axis::traits::static_options: use axis::traits::get_options
 - Template function axis::traits::static_is_inclusive: use axis::traits::is_inclusive
 - Type alias indexed::range_iterator: use indexed::iterator
 - Type alias indexed::accessor::reference: use indexed::accessor::const_reference
Iterator:
- For C++11 and later, added support for perfect forwarding of values written to function_output_iterator. (PR#73)
- Added protection against writing to function_output_iterator a result of dereferencing another function_output_iterator.
JSON:
- Added non-const value::at overloads.
- Added the ability to manually choose endianness of the platform.
- Added string::subview() overload.
- Fixed segfault in array::erase(it).
- Fixed low performance of serialize on libc++.
- Fixed ambigious conversion to std::string_view on GCC 8.
- Fixed parsing on big-endian platforms.
- Fixed handling of comment after trailing comma.
LEAF:
- API breaking change: throw leaf::exception(....) now becomes leaf::throw_exception(....)
- Fixed a bug in support for a rare build configuration (exception handling enabled, diagnostics disabled)
- Using nullptr instead of 0 throughout
- Fixed pedantic warnings
Locale:
- Deprecated support for C++03 and earlier, C++11 will be required in the next release
- Provide -sICU_LINK_LOCALE as a temporary replacement for -sICU_LINK which is incompatible with Boost.Regex. -sICU_LINK_LOCALE and -sICU_LINK are deprecated and will be replaced by ICU_*_NAME options to be compatible with Boost.Regex
- Fix UB/assertion failure in the ICU collator implementation when transforming empty strings
- Fix some issues related to visibility of classes in shared libraries (Unix only)
- Fix compatibility with C++20 mode
- Fix compatibility with BOOST_USE_WINDOWS_H
- Fix build failures due to missing includes
- Handle or suppress many warnings which makes the build log cleaner
Log:
- Bug fixes:
  - Fixed binding incorrect local address in UDP socket-based syslog_backend when IPv6 address is used for the syslog server. (#181)
  - Added a workaround for a bug in libstdc++ from gcc 11.2. When max_size_decor was used on a formatting stream, std::codecvt::do_length incorrectly accessed the input buffer and caused a buffer overflow.
- See changelog for more details.
Math:
- Deprecated C++11 support: from 2023 we will require C++14 as a minimum standard. This will mean GCC-5 or MSVC-14.1 as a minimal requirement.
- Add constexpr fma support, see 734.
- Add support for the Chatterjee Correlation Coefficient, see 770.
- Added support for the logarithm of the PDF for all the distributions.
- Improve support for building with no exception or RTTI support.
- Some minor bug fixes for [sub 1]F[sub 1] corner cases, see 778.
Multiprecision:
- Mark C++11 support as deprecated: from 2023 we will move to requiring C++14 as a minimum standard level. That will drop support for GCC versions prior to 5 and MSVC prior to 14.1.
- Fix conflict between boost/cstdfloat.hpp and this library.
- Clean up lots of gcc and clang warnings.
- Fix input streaming of composite types (complex, interval rational) where there is a trailing delimeter in the stream and no whitespace.
- Fix constexpr integer square root where the input is 1, 2 or 3.
- Add missing #include of <memory> to float128.hpp.
- Correct 2-arg constructor for class number to prevent ambiguity in some cases.
- Correct and make more consistent behaviour of divide-by-zero in gmp.hpp.
Multi-index Containers:
- Maintenance work.
Nowide:
- Major performance improvement for Bulk I/O with files
- basic_filebuf: Fix wrong return value of sync when fflush failed
- basic_filebuf: Fix possible undefined behavior in a corner case when nothing was actually written but buffer is in "write" mode
- basic_filebuf: Limit putback of characters (i.e. pbackfail) only allowing putback of buffered characters (may be only 1 character)
Optional:
- Added specializations for std::hash<boost::optional<T>>. This is a breaking change for programs that define such specializations themselves. For more details see specs.
STLInterfaces:
- Fix #53: "missing 'typename' prior to dependent type name 'C::const_iterator'"
- Fix #54: "Concept check fails on .data() of a view on contiguous iterator_interface instantiations"
- New additions to make it easy to write views and view adaptors that work like, and interoperate with, the ones in the standard library:
  - Add workalikes for C++23's std::bind_back() and std::range_adaptor_closure for pre-C++23 code.
  - Add templates closure and adaptor to make writing view adaptors easier, following the examples in P2387.
System:
- When an error_code is converted to std::error_code and then back to error_code, the original is now restored, if possible.
- Reworked the conversion from error_category to std::error_category to avoid the one-time allocation that shows up on leak checkers.
- Added a constructor that allows replacing the source location of an error_code, and a corresponding assign.
- Added a converting constructor to result.
Unordered: Major update:
- Refactor internal implementation to be dramatically faster
- Allow final Hasher and KeyEqual objects
- Update documentation, adding benchmark graphs and notes on the new internal data structures
Utility:
- In string_view/string_ref, fixed max_size returning incorrect value. (#91)
- Removed noexcept specifier from string_view::compare as it may throw on some input arguments. (#94)
- In string_view/string_ref, added support for calling substr with no arguments. (#96)
- Added string_view::contains methods that were introduced in C++23. (#93)
- In string_view, added asserts in remove_prefix/remove_suffix methods to enforce the precondition that the prefix/suffix length does not exceed the string view size. The previous (undocumented) behavior of silently clamping the prefix/suffix length is deprecated and will be removed in a future release. (#92)
Wave: Fixed bugs:
- #24: Line numbers wrong after conditional section
- #160: one test fails with error C2660 and error C2440 under msvc /permissive- mode
- #161: BOOST_WAVE_THROW_NAME_CTX does not result in a context callback and always throws
- #162: When Boost headers are included in the preprocessed translation unit, Wave fails in boost/integer.hpp(99)

Updated Tools

Build:
- Includes release of B2 version 4.9.2.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0, 13.0.0, 14.0.0
- Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0, 13.0.0, 14.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0, 13.0.0, 14.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0
- GCC: 4.6.3, 11, 12
- GCC, C++11: 4.7.3, 4.8.5, 11, 12
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11, 12
- GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
OS X:
- Apple Clang: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2, 14.3

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.79.0

Wed, 13 Apr 2022 14:22:59 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release.

Boost.JSON array::erase can segfault, see #692. Patch.

New Libraries

No new libraries.

Updated Libraries

Asio:
- Added bind_allocator.
- Added file_base::sync_all_on_write flag.
- Added missing implementation of basic_file::release().
- Added per-operation cancellation support to signal sets.
- Exposed recycling_allocator as part of the public interface.
- Added the nodiscard attribute to a number of functions.
- Added OpenSSL 3.0 compatibility.
- Added support for adopting an existing SSL* into an ssl::stream<>.
- Enabled executor_work_guard<> in all build configurations.
- Enabled movable socket iostreams when using clang.
- Fixed bind_cancellation_slot and bind_executor compatibility with legacy completion tokens.
- Fixed associator specialisations for experimental::append and experimental::prepend.
- Fixed associated_allocator primary template.
- Fixed io_uring implementations of async_receive_from for sockets and write_some_at for files.
- Fixed io_uring feature detection.
- Fixed experimental::coro's per-operation cancellation.
- Fixed memory management in experimental::promise's type-erased completion handlers.
- Fixed move operator= implementation for ssl::stream.
- Fixed any_io_executor implementation to work when both BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT and BOOST_ASIO_SEPARATE_COMPILATION are defined.
- Fixed implementation of basic_socket::at_mark() when using the sockatmark() system call.
- Changed the recycling allocator to use the default alignment as the minimum alignment for allocations.
- Added a workaround for apparent coroutine codegen bug with Apple's clang.
- On Windows, changed the file support to open files using the same sharing mode as fopen().
- On Linux, fixed UNIX domain sockets implementation to correctly handle EAGAIN.
- Fixed implementation of experimental::basic_channel::reset() and experimental::basic_concurrent_channel::reset().
- Fixed potential undefined behaviour in the experimental::promise.
- Changed the co_spawn implementation to dispatch cancellation signals through the executor in some circumstances.
- Fixed various header inclusion issues.
- Fixed various warnings.
- A number of documentation enhancements, including:
 - Added an overview of Asio's asynchronous model.
 - Reworked reference and requirements documentation in terms of asynchronous model.
 - Updated documentation for dispatch(), post(), and defer().
 - Documented per-operation cancellation for serial ports.
 - Clarified the non-concurrency guarantees made for allocators.
 - Reverted the io_context reference documentation to use executor_work_guard.
 - Added more detailed reference documentation to make_strand(), make_work_guard(), ip::address_v4, ip::address_v6, experimental::basic_channel, and experimental::basic_concurrent_channel.
 - Re-arranged and extended the Overview documentation to cover recently added features.
- Added a C++11 example showing file descriptor passing over local sockets.
- Added C++14 examples of wrapping callback-based APIs in asynchronous operations.
- Consult the Revision History for further details.
Assert:
- source_location().file_name() and source_location().function_name() now return "" instead of "(unknown)".
- Added a source_location constructor from std::source_location.
- Changed BOOST_CURRENT_LOCATION to more closely match the behavior of std::source_location::current(), such as being usable at top level or as a default function argument.
Atomic:
- Fixed compilation for Universal Windows Platform (UWP). (#54)
- Added BOOST_ATOMIC_NO_DARWIN_ULOCK configuration macro. The macro affects compilation on Darwin systems and disables ulock-based implementation of waiting and notifying operations. This may be useful to comply with Apple App Store requirements. (#55)
Beast:
- Added missing include for file_body test.
- Fixed WebSocket handshake response on failure.
- Fixed open append mode for file_posix and file_win32.
- Fixed file open with append/append_existing flag on Windows
- Fixed clang-cl UTF8 path handling for file_win32 and file_stdio.
- Added ARM64 builds to drone CI.
- Fixed async_base documentation link.
- Added tests for file open in append/append_existing mode.
- Updated CI to include gcc 11, clang 12, msvc 14.3.
- Added individual tests to CMake workflow.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Core:
- Made boost::pointer_traits SFINAE friendly, addressing LWG3545. (Glen Fernandes)
- Added boost::allocator_traits that uses the individual allocator access traits. This implementation supports C++03 and above. (Glen Fernandes)
- Updated the allocator access traits to support most of the C++11 allocator model in C++03. (Glen Fernandes)
- boost/iterator.hpp is deprecated and will be removed in a future release. The header defines boost::iterator template, which is equivalent to std::iterator in <iterator> header. However, since std::iterator is itself deprecated in C++17, users are advised to remove boost::iterator or std::iterator use from their code.
- Added boost::core::verbose_terminate_handler, a utility function intended to be passed to std::set_terminate that prints information about the uncaught exception to stderr.
Describe:
- Enabled unions in BOOST_DESCRIBE_STRUCT and updated examples to check std::is_union<T>.
- Added example of defining a fmtlib class formatter.
- Added example of defining a fmtlib enum formatter.
- Added example of printing pointers to members.
Filesystem:
- v3: path::replace_extension now works in terms of v3 definition of path::extension rather than v4.
- Fixed compilation of path appending and concatenation operators with arguments of types convertible to path or compatible string type. (#223)
- On POSIX systems that support fdopendir and O_NOFOLLOW and on Windows, remove_all is now protected against CVE-2022-21658. The vulnerability is a race condition that allows a third party process to replace a directory that is being concurrently processed by remove_all with a directory symlink and cause remove_all to follow the symlink and remove files in the linked directory instead of removing the symlink itself. (#224)
- On Windows, in remove and remove_all implementation, use POSIX semantics for file removal, when supported by the OS (Windows 10 1709 and later). When POSIX semantics is supported, the file name is removed from the filesystem namespace as soon as the file is marked for deletion, even if it is still open and in use. With legacy Windows semantics, the file name remains present in the the filesystem namespace until the last file handle to the file is closed, which allows the file marked for deletion to be opened and prevents creating new files with the same name. (#216)
- On Windows, remove and remove_all now support deleting read-only directories. Support for removing read-only non-directory files was added previously.
- On Windows, directory_iterator internal implementation has been reworked to better utilize modern Windows APIs, which may improve performance while handling symlinks.
- On Windows, initialize internal WinAPI function pointers early, if possible, to allow Boost.Filesystem operations to be invoked in global constructors. This is only supported on MSVC, GCC, Clang and compatible compilers.
- On Windows, resize_file should no longer fail with an error if the file to be resized is opened.
- Disabled use of the statx syscall on Android prior to 11.0 (API version 30). The syscall is blacklisted by seccomp and causes process termination in runtime. (#229)
- Deprecated: boost/filesystem/string_file.hpp header is deprecated and will be removed in a future release. The header is no longer included by boost/filesystem.hpp by default. Users are advised to implement the functionality themselves or migrate to other implementations.
- Deprecated: Windows CE support is deprecated and will be removed in a future release. Windows CE has been untested for many years and is likely non-functional.
Geometry:
- Major change
  - PR#977 Rescaling is turned off by default. This avoids many related bugs in set operations and buffer.
- Improvements
  - PR#923 Added algorithm closest_points for cartesian point/geometry.
  - PR#939 Added algorithm closest_points for other coordinate systems and geometry combinations excl. boxes.
  - PR#961 Added Web Mercator projection.
  - PR#966 More efficient cartesian distance strategy used in simplify.
- Solved issues
  - #956 Result of simplify algorithm with incorrect closure.
  - #962 Runtime error in R-tree deserialization due to load factor.
  - #971 R-tree insertion time impacted by use of long double on ARM platforms.
- Bugfixes
  - PR#936 Envelope of polygon containing pole.
  - PR#948 Spherical and geographic envelope for near meridian segments.
  - PR#974 Spheroidal normalization utilities for NaN coordinates.
  - Various fixes in set operations and buffer.
Integer:
- Optimized integer_log2 implementation to use bit operations internally. This allows to employ bit instructions available on most modern CPUs. (#31)
IO:
- Added boost::io::basic_nullbuf, a null stream buffer, and boost::basic_onullstream, a null output stream (Glen Fernandes).
Iterator:
- In counting_iterator, added support for built-in 128-bit integer types supported by gcc and clang and compatible compilers on some target platforms.
- Silenced gcc warnings about deprecated implicit copy assignment operator in counting_iterator.
JSON:
- Standalone mode of the library is removed. Users who wish to continue using standalone JSON can switch to the C++ Alliance fork.
- Add std::error_code overloads.
- Add boost::source_location to error_codes.
- Add support for JSON Pointer.
- Naturally grow string during serialization.
LEAF:
- Support for FreeRTOS and other embedded platforms
- Improved diagnostic information
- Improved configuration macros
- BOOST_LEAF_CHECK using statement expressions under __GNUC__
- Fixed symbol demangling bug
Log:
- General changes:
  - In text_file_backend, added support for appending to a previously written log file, when file rotation is used and log file names use file counters.
  - Breaking change: The file_collector interface has changed:
    
    scan_for_files method returns a scan_result structure that contains information collected during the scan;
    
    is_in_storage method added for testing if a path refers to a file within the target storage directory.
  - Added a new invoke_manip stream manipulator that can be used for injecting user's function into a stream output expression.
- Bug fixes:
  - Fixed file counter being set to zero if the user calls text_file_backend::scan_for_files multiple times, and the second and the following calls don't find any new files. (#179)
- See changelog for more details.
Multi-index Containers:
- Improved the efficiency of count operations in ranked indices from O(log(n) + count) to O(log(n)). Contributed by Damian Sawicki.
- Maintenance work.
Nowide:
- Fix compilation issues on some platforms (e.g. GCC 11 on MinGW-w64 and Cygwin)
- Fix missing include when using BOOST_USE_WINDOWS_H and WIN32_LEAN_AND_MEAN
- Add sanity check when using boost::nowide::stat with boost::nowide::stat_t
Optional:
- Fixed issue #98.
- Fixed issue #92.
- Added support for BOOST_NO_IOSTREAM.
- Now aligned storage uses unsigned char rather than char to avoid UB.
- Now using cv-unqualified value_type with placement new to avoid UB.
Predef:
- Version 1.14.0
- Add detection of LoongArch (from Zhang Na).
QVM:
- Added constexpr under C++17
- Improved single header distribution
Smart Pointers:
- Added boost::get_allocator_pointer to obtain the Allocator pointer from the result of boost::allocate_unique (Glen Fernandes).
System:
- Added a boost::source_location parameter to throw_exception_from_error.
- Added throw_exception_from_error overloads for errc::errc_t, std::error_code, std::errc, std::exception_ptr.
- result<T>::value now automatically supplies BOOST_CURRENT_LOCATION to throw_exception_from_error via a default argument.
- Added an errc::make_error_code overload taking a source location.
ThrowException:
- Added boost::throw_with_location, a more lightweight alternative of BOOST_THROW_EXCEPTION for programs that do not use Boost.Exception.
Unordered:
- All containers have been updated to support heterogeneous count, equal_range and find.
- All containers now implement the member function contains.
- erase_if has been implemented for all containers.
- All containers have been updated to support heterogeneous erase and extract.
- Changed behavior of reserve to eagerly allocate.
- Various warning fixes in the test suite.
- Update code to internally use boost::allocator_traits.
- Switch to Fibonacci hashing.
- Update documentation to be written in AsciiDoc instead of QuickBook.
Variant2:
- Added operator<< for monostate.
Wave:
- C++11 now required for building Wave itself
- Fixed bugs:
  - #135: Comma operators in array subscripts are deprecated in C++20
  - #137: Simple unknown directive => found_unknown_directive is not called, stripped of pound.
  - #138: Empty ifdef block does not emit line directive for missing whitespace
  - #143: Parsing __has_include() fails with trailing tokens
  - #145: Sanitizer complains about reset_version()
  - #147: bitwise operations between different enumeration types are deprecated

Updated Tools

Build:
- Includes release of B2 version 4.8.2.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
- Clang, C++11: 3.4, 11.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0
- GCC: 4.6.3, 11
- GCC, C++11: 4.7.3, 4.8.5, 11
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++20: 8.0.1, 9.1.0, 10, 11
OS X:
- Apple Clang: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.78.0

Wed, 08 Dec 2021 03:45:49 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release.

Boost.Build silently skips installation of library headers and binaries in some cases, see #104.
- Fixed in PR#113, patch.
Boost.Atomic fails to build when targeting UWP, see #54. Patch.

New Libraries

No new libraries.

Updated Libraries

Asio:
- Added an io_uring backend that may optionally be used for all I/O objects, including sockets, timers, and posix descriptors.
- Added support for files, with new new classes for stream-oriented and random-access files. This feature currently supports I/O completion ports on Windows, and io_uring on Linux.
- Added support for portable pipes on POSIX and Windows (when I/O completion ports are available).
- Added support for registered buffers, which are optimised when using the io_uring backend.
- Added experimental support for channels, that may be used to send and queue completions as messages.
- Implemented improvements to experimental::coro.
- Disabled aligned_alloc on clang when using an MSVC runtime.
- Changed to use a faster implementation for ip::network_v4::canonical().
- Added template specialisations for common uses to improve compile time.
- Reduced the size of io_context executors to a single pointer.
- Increased the small object buffer size for execution::any_executor and any_io_executor.
- Fixed multi-signature handling when variadic templates are disabled.
- Fixed compatibility with new versions of gcc and clang.
- Fixed compilation on Solaris.
- Fixed defence against Qt-defined macros when building with MSVC.
- Improved error messages emitted by ssl facilities.
- Fixed bind_executor compatibility with completion tokens.
- Fixed build errors when BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT is defined.
- Added missing move assignment operator to awaitable<>.
- Fixed an access violation when using coroutines with MSVC, due to incorrect alignment of allocated memory.
- Fixed a cleanup issue in experimental::parallel_group that occured when the execution context was shut down with parallel operations still pending.
- Added clarifications to the documentation on concurrency hints.
- Added documentation on error handling techniques for C++20 coroutines.
- Fixed various warnings.
- Consult the Revision History for further details.
Assert:
- Added source_location::to_string.
Atomic:
- Use process-local futex operations on Android for non-IPC waiting and notifying operations.
- Added support for Linux targets that only define SYS_futex_time64 syscall, such as riscv32.
- Added a workaround for incorrect result of std::alignment_of on clang 8 for 64-bit types on 32-bit x86 targets.
- Added a ulock backend for waiting and notifying operations on Darwin systems since Mac OS 10.12, iOS 10.0, tvOS 10.0 or watchOS 3.0.
- On Windows, corrected discrepancy between atomic-type::always_has_native_wait_notify and the corresponding capability macros when targeting Windows 8 or later. The library will now directly use WaitOnAddress and related APIs from public headers and therefore require user to link with synchronization.lib if the user requires Windows 8 or later by defining BOOST_USE_WINAPI_VERSION, _WIN32_WINNT or similar macros. The library is linked automatically on compilers that support auto-linking (e.g. MSVC).
- Added support for types with padding bits, except unions, on compilers that provide a way to clear the padding bits. This feature is supported by gcc 11 and MSVC 14.2 (compiler version 19.27) and newer, as well as other compilers supporting similar intrinsics. On compilers that don't allow to clear the padding bits, types with padding are still generally not supported with the exception of 80-bit long double on x86 targets. A new BOOST_ATOMIC_NO_CLEAR_PADDING capability macro is defined to indicate when clearing the padding is not supported.
- Initializing constructors of atomic_ref and ipc_atomic_ref no longer use atomic instructions to clear the padding bits in the referenced object. This reduces the cost of the atomic reference construction.
- Initializing constructors of atomic and ipc_atomic are now constexpr for enums, classes and floating point types. For classes and floating point types, the constructors are constexpr if the compiler supports constexpr std::bit_cast, the type has no padding bytes and no padding is required to implement native atomic operations.
- In accordance with C++20, default constructors of atomic and ipc_atomic now perform value initialization of the contained object. For types without a user-defined default constructor, this means the default-constructed atomic will be zero-initialized.
- Added a workaround for compilation error on AIX caused by the assembler tool not supporting numeric labels. (PR#50)
- Added a workaround for compilation error with Visual Studio 2015 prior to Update 3. (#52)
- See changelog for more details.
Beast:
- This maintenance update brings minor bug fixes and updated CI reporting.
- Fixed security vulnerability CVE-2016-9840 in zlib implementation.
- Fixed WebSocket permessage_deflate implementation. This should result in an increase in compression performance when using Beast WebSockets.
- Removed the test stream and test framework's dependency on RTTI. You can now use our handy test stream to check your embedded asynchronous communications code!
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Core:
- Added a generic implementation to <boost/core/cmath.hpp>, enabled when BOOST_CORE_USE_GENERIC_CMATH is defined or when the platform does not provide the necessary facilities in <cmath>.
- Added boost::core::type_name, a utility function that returns the name of a type as a string.
- Added boost::span, a C++11 implementation of C++20's std::span (Glen Fernandes).
Describe:
- Added has_describe_enumerators, has_describe_bases, has_describe_members.
- Added enum_to_string, enum_from_string.
- Added relational and stream insertion operators.
- Added descriptor_by_name, descriptor_by_pointer.
DLL:
- Fixed missing #include, thanks to Denis Blank (PR#54)
- Dropped TravisCI in favor of GithubAction CI
Filesystem:
- v4: path::filename and path::iterator no longer return an implicit trailing dot (".") element if the path ends with a directory separator. Instead, an empty path is returned, similar to C++17 std::filesystem. This also affects other methods that are defined in terms of iterators or filename, such as path::stem, path::compare or lexicographical_compare. For example, path("a/b/") == path("a/b/.") no longer holds true. (#193)
- v4: path::lexically_normal no longer produce a trailing dot (".") element and omits a directory separator after a trailing dot-dot ("..") element in the normalized paths.
- v4: path append operations now consider root name and root directory in the appended path. If the appended path is absolute, or root name is present and differs from the source path, the resulting path is equivalent to the appended path. If root directory is present, the result is the root directory and relative path rebased on top of the root name of the source path. Otherwise, the behavior is similar to v3. (#214)
- path::lexically_normal now converts directory separators to preferred separators in the root name of the normalized paths.
- Optimized overloads of path::assign, path::append, path::concat and the corresponding operators to avoid unnecessary path copying and reduce the amount of code redundancy.
- On POSIX systems, fixed absolute(p, base) returning a path with root name base.root_name() if p starts with a root directory. In such a case p is already an absolute path and should be returned as is.
- create_directories no longer reports an error if the input path consists entirely of dot (".") and dot-dot ("..") elements. The implementation is no longer using recursion internally and therefore is better protected from stack overflow on extremely long paths.
- On Windows, remove now supports deleting read-only files. The operation will attempt to reset the read-only attribute prior to removal. Note that this introduces a possibility of the read-only attribute being left unset, if the operation fails and the original value of the attribute fails to be restored. This also affects remove_all. (#216)
- remove_all now returns static_cast< uintmax_t >(-1) in case of error, similar to C++17 std::filesystem.
- Fixed a linking error about unresolved references to Boost.ContainerHash functions when user's code includes boost/filesystem/path.hpp but not boost/container_hash/hash.hpp and the compiler is set to preserve unused inline functions. (#215)
- Added a workaround for MSVC and compatible compilers eliminating path globals cleanup in release builds. This could lead to a memory leak if Boost.Filesystem shared library was repeatedly loaded and unloaded in the process. (#217)
Geometry:
- Improvements
  - PR#894 Optimization and refactoring of rtree queries.
  - PR#913 DynamicGeometry and GeometryCollection support in various algorithms (undocumented for now).
  - PR#922 DynamicGeometry and GeometryCollection support in distance (undocumented for now).
- Solved issues
  - #867 Poor performance of rtree query iterator with nearest predicate for big k.
  - #870 Compilation error in boost::geometry::self_turns.
  - #896 Assertion failure in get_turns with BOOST_GEOMETRY_NO_ROBUSTNESS.
- Bugfixes
  - PR#906 Invalid result of buffer on macos-11 with clang-12.
  - PR#921 Compilation errors with c++20 (various compilers) and gcc-5.
  - Various fixes in set operations and buffer.
JSON:
- Standalone mode of the library is deprecated.
- Allow external libraries to forward declare value_to and value_from.
- Fixed signed integer overflow in number parsing.
- Add support for /Zc:implicitNoexcept- on MSVC.
Lambda2:
- Added special cases in operator<< and operator>> when the first argument is a stream, to allow std::cout << _1.
- Added operator->*.
- Added first, second.
Log:
- General changes:
  - Updated detection of std::codecvt specializations for char16_t and char32_t for compatibility with C++17 and later. (PR#159)
  - Added support for C++17 std::byte type to receive methods of the inter-process message queue.
  - On Windows, when building the library for Windows 8 or later, the library will use nt62 tag in the version namespace to denote the target OS ABI. For example, the version namespace could be named as v2_mt_nt62. This name will be part of all symbols exported by the library. Use the BOOST_USE_WINAPI_VERSION macro consistenly when building Boost and your code to request the minimum target Windows version.
  - Improved performance of SSSE3 and AVX2 implementations of the dump stream manipulator.
  - Added support for CMake build system. Only library build is supported at this moment, Boost.Build is still used for running tests.
- Bug fixes:
  - Fixed a race condition on POSIX systems in reliable_message_queue::open_or_create or the equivalent constructor. Multiple threads or processes calling open_or_create concurrently with sending or receiving messages from the same queue could end up corrupting the queue contents and potentially crashing the process. (#162)
  - Added a workaround for b2 install failing on Windows because of missing boost_log_setup library if BOOST_LOG_WITHOUT_SETTINGS_PARSERS is defined. (#164)
- See changelog for more details.
Math:
- Add support for cubic roots.
- Add support for constexpr versions of various standard library math routines.
- Add support for Bezier polynomials.
- Improve worst-case tanh-sinh integration performance.
- Disable inadvertant use of integral types in integration routines.
- Minor update for erf approximations when the result is with 2ulp of 1.
- Allow Bernoulli code to be used on platforms with no atomic integers.
- Improve the mode of the non-central Chi Squared distribution.
- Improve certain edge cases for <cstdfloat> complex-valued elementary functions, see #507.
Multi-index Containers:
- Added contains to key-based indices (issue #35).
- Added merge operations to key-based indices. The functionality goes beyond the standard specification for (unordered) associative containers in a number of ways, most notably:
  - The source index can be of any type, including non key-based indices.
  - Partial merge is provided: for instance, x.merge(y,first,last) merges only the elements of y within [first,last).
- Previous versions of splice for sequenced and random access indices were destructive, i.e. elements were copy-inserted into the destination and then erased from the source. Now, splice is based on node transfer much as merge in key-based indices, and has been similarly extended to accept source indices of any type: in fact, splice can be regarded as a frontend to the same functionality provided by merge in key-based indices. For reasons of backwards compatibility, the destructive behavior of splice has been retained in the case that the source and destination containers have unequal allocators.
- The fact has been documented that index iterator types do only depend on node_type and the position of the index in its multi_index_container, (except for hashed indices, where uniqueness/non-uniqueness is also a dependency). This has implications on the validity of iterators to elements transferred by merge or splice. This property is a variant of what has been called SCARY iterators in the C++ standard mailing lists. SCARYness is currently (August 2021) not mandated for standard containers.
- Iterator SCARYness is now also preserved in safe mode.
Multiprecision:
- Rework rational_adaptor to remove dependency on Boost.Rational and improve performance.
- Fix issue with type_traits and clang, see #383.
- Fixed buggy Lehmer's GCD routine, see #370.
- Fix mpc_complex constructors so that lossy conversions are explicit, see #363.
- Correct miscellaneous configuration issues (Intel intrinsic usage and Apple clang).
- Correct some iostream operators for unsigned char types.
- Correct mpq_rational conversions to integer types, see #342.
Nowide:
- Breaking Change: do_unshift for the UTF-32 specialization of utf8_codecvt now correctly returns noconv instead of ok
- Remove unnecessary branch in utf8_codecvt for UTF-16 output
- Suppress deprecation warnings in MSVC when using utf8_codecvt with unicode char types
- Fix possible double-free when setting a custom buffer (setbuf) after filebuf already allocated an internal buffer
PFR:
- Added missing #include <memory> for inclusion of std::addressof
- Fixed -Wzero-length-array warning when dealing with empty aggregates
- Fixed compilation on msvc compilers <= 1920 (thanks to Alexey Romanov aka @alexey-romanov)
- Added basic CMakeLists.txt support (thanks to @pdimov aka Peter Dimov)
- Multiple improvements for docs, including links to https://github.com/apolukhin/pfr_non_boost
- Added misc/strip_boost_namespace.sh script to remove boost:: and BOOST_ prefixes
Predef:
- Version 1.13.1
- Fix spelling of "epoch".
- Add missing parenthesis in sparc.h (from tkoecker).
- Update documentation to use Rouge code styling and Amber general style.
Regex:
- Breaking Change: Change \B to be the opposite of \b as per Perl behaviour.
- Change w32_regex_traits.hpp so that windows.h is no longer included.
- Fxed fuzzing related issues #151, #152, #153, #156.
System:
- Added support for source locations to error_code.
- Added error_code::to_string, error_condition::to_string, error_code::what.
- system_error::what() now contains the source location, if present.
- Added result<T, E = error_code>, a class holding either a value or an error, defined in <boost/system/result.hpp>.
Utility:
- Library documentation converted to QuickBook (thanks to Alan de Freitas, PR#79).
Variant2:
- Added <boost/variant2.hpp>.
- Added unsafe_get.
- Added visit_by_index.
- Added operator<<.

Updated Tools

Build:
- Includes release of B2 version 4.7.2.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
- Clang, C++11: 3.4, 11.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0
- GCC: 4.6.3, 11
- GCC, C++11: 4.7.3, 4.8.5, 11
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++20: 8.0.1, 9.1.0, 10, 11
OS X:
- Apple Clang: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.77.0

Wed, 11 Aug 2021 14:25:13 +0000

New Libraries

Describe: A C++14 reflection library, from Peter Dimov. Provides macros for describing enumerators and struct/class members, and primitives for querying this information.
Lambda2: A C++14, dependency-free, single header lambda library, from Peter Dimov. Allows simple function objects to be constructed via expressions such as _1 + 5, _1 % 2 == 0, _1 > _2, or _1 == ' ' || _1 == '\t'.

Updated Libraries

Any:
- Added boost::anys::basic_any - a data type with customizable Small Object Optimization whose instances can hold instances of any type that satisfies ValueType requirements (many thanks to Ruslan Arutyunyan @rarutyun). If you are not sure that you really need it, then use boost::any instead.
- Started using GithubActions CI for additional testing
Asio:
- Added support for cancellation of individual asynchronous operations.
- Added the associator trait, used to generically forward associators.
- Changed all asynchronous operations implemented in Asio to invoke their completion handlers as rvalue references.
- Added support for asynchronous operations with multiple completion signatures.
- Added operator&& and operator|| for awaitable<>, to allow coroutines to be trivially awaited in parallel.
- Added the experimental::as_tuple completion token adapter.
- Added the experimental::append completion token adapter.
- Added the experimental::prepend completion token adapter.
- Added the experimental::deferred completion token, whicih allows deferred execution of asynchronous operations.
- Added the experimental::parallel_group class and experimental::make_parallel_group function.
- Added experimental::promise, which allows eager execution and synchronisation of asynchronous operations.
- Added the experimental::coro class template, a C++20 coroutine primitive with the ability to combine both asynchronous waiting (co_await) and yielding (co_yield).
- Added move assignment to ssl::stream<>.
- Changed co_spawn to dispatch the coroutine's initial step to the executor.
- Enabled additional optimisations for any_executor and any_io_executor when used with asynchronous operations.
- Added the nodiscard attribute to awaitable<>.
- Increased the number of cached slots in the default recycling allocator.
- Changed the default allocator behaviour to respect alignment requirements, to support over-aligned types.
- Ensured the result strings are always initialised in reverse name resolution.
- Fixed recursive template instantiation issues in use_awaitable_t::executor_with_default.
- Fixed the any_io_executor equality operators to correctly return a result based on the target executor.
- Fixed strand<> to avoid using a potentially moved-from executor.
- Ensured gcc tests are not used for clang when detecting compiler features.
- Disabled coroutines support for the clang shipped with MSVC.
- Fixed compatibility with recent LibreSSL when OPENSSL_NO_SSL_INTERN is defined.
- Fixed posix::basic_stream_descriptor move operations to work with non-defaulted executors.
- Consult the Revision History for further details.
Atomic:
- Added make_atomic_ref and make_ipc_atomic_ref factory functions for constructing atomic reference objects.
- Added C++17 template argument deduction guides for atomic_ref and ipc_atomic_ref to allow omitting template arguments when they can be deduced from constructor arguments.
Beast:
- This maintenance update brings minor bug fixes and updated CI reporting.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Conversion:
- boost::implicit_cast is now constexpr (#25).
- Fixed broken links (PR#23).
- Started using GithubActions CI for additional testing
Core:
- boost/core/uncaught_exceptions.hpp has been modified for compatibility with Mac OS 10.4 and older. (PR#92)
DLL:
- More runtime checks for malformed ELFs in boost::dll::library_info
- In boost::dll::library_info use info from .dynsym ELF section if .symtab is empty or missing
- List protected ELF symbols in boost::dll::library_info as they are available for import (#50)
- Remove unneeded convert from wchar_t to char on POSIX environment, thanks to Vladislav Shchapov (PR#49)
- Started using GithubAction CI for additional testing
Filesystem:
- Introducing Boost.Filesystem v4. This new version of the library removes all deprecated features of v3 and also makes a number of breaking API changes intended to make Boost.Filesystem more compatible with std::filesystem introduced in C++17. The differences are described in the release notes and documentation using v3 and v4 tags and are also summarised in a separate section. Users can select Boost.Filesystem version by defining BOOST_FILESYSTEM_VERSION macro to either 3 or 4 when compiling their code. There is no need to separately compile Boost.Filesystem for each library version - a single binary supports both v3 and v4. Users should avoid using both v3 and v4 in the same application as this can lead to subtle bugs. Currently, v3 is the default. In a future release v4 will become the default, and eventually v3 will be removed. v4 is functional, but it is still a work in progress and there may be breaking API changes in the future.
- v4: path::filename, path::stem and path::extension no longer consider root name or root directory of the path as a filename if the path only consists of those components. For example, on Windows path("C:").filename() used to return "C:" and path("C:\\").filename() used to return "\" and both will return an empty path now. (#88, #194)
- v4: path::stem and path::extension no longer treat a filename that starts with a dot and has no other dots as an extension. Filenames starting with a dot are commonly treated as filenames with an empty extension. The leading dot is used to indicate a hidden file on most UNIX-like systems. (#88)
- New: Improved support for various path prefixes on Windows. Added support for local device prefix ("\\.\") and experimental support for NT path prefix ("\??\"). The prefixes will be included in the root name of a path. Note that using the prefixes with Boost.Filesystem v3 can lead to surprising results (e.g. path("\\\\.\\").stem() == "\\\\"). It is recommended to use the prefixes only with Boost.Filesystem v4.
- Reworked path::lexically_normal implementation to eliminate some cases of duplicate dot (".") elements in the normalized paths.
- New: Added runtime detection of the statx and getrandom system calls on Linux. This can be useful if the syscall is present at compile time but fails with ENOSYS at run time (for example, in Docker containers that restrict the syscall, even if available on the host). (#172)
- New: Added support for disabling usage of various system APIs at library build time. This can be useful when a certain API is detected as present by the library configuration scripts but must not be used for some reason (for example, when runtime detection does not work on the target system). See the description of configuration macros in the library documentationfor for more details.
- New: Added copy_options::synchronize_data and copy_options::synchronize options for the copy_file operation. These options allow to synchronize the written data and attributes with the permanent storage. These options are expensive in terms of performance, but allow to ensure reliability of the copied data. Note that copy_file performed implicit data synchronization on POSIX systems since Boost.Filesystem 1.74.0. This release adds support for more platforms and disables data synchronization by default while allowing the caller to explicitly request it. (#186)
- Added handling of EINTR error code on POSIX systems for some system calls issued internally. In particular, EINTR could have been ignored on close, which on HP-UX would result in a leaked file descriptor.
- In the copy_file implementations based on Linux sendfile and copy_file_range system calls, added handling of error codes indicating that a particular filesystem does not support the system call and fall back to the generic read/write loop. This should fix copy_file failing on eCryptFS and possibly other filesystems. (#184)
- The copy_file_range system call is now used since Linux kernel 4.5, whereas previously it was only enabled since 5.3. The copy_file implementation will fall back to sendfile or read/write loop if copy_file_range fails to copy a given file across filesystems.
- The copy_file implementations based on Linux sendfile and copy_file_range system calls will not be used on filesystems that are known to contain files with generated content. These system calls are incompatible with such files, and copying them would result in zero-sized files. The generic read/write loop will be used instead. Currently, the blacklisted filesystems are: procfs, sysfs, tracefs and debugfs.
- In the copy_file implementation based on read/write loop, increased the maximum size of the buffer used for temporary storage and take into account the target filesystem block size for more optimal performance.
- On Windows CE, calling current_path to obtain the current path for a process will now fail with an error instead of returning successfully with a root path. This platform does not support current directory. Changing the current path was already failing similarly in previous releases of Boost.Filesystem.
- In canonical, fixed the check for a symlink referencing a directory above root, if an earlier symlink was resolved to an absolute path with a different root from the original path.
- In canonical, added a limit for the maximum number of symlinks that can be resolved during the call. The limit is currently at least 40 symlinks.
- On Windows, canonical and weakly_canonical will now use path::preferred_separator for the root directory separator in the resulting paths. This fixes "file not found" errors caused by Windows API not handling generic separators in UNC paths and paths that start with the Win32 filesystem prefix ("\\?\"). (#87, #187)
- New: Added weakly_canonical overloads taking base path as an argument.
- On Windows, weakly_canonical no longer fails with an error if the input path contains elements that do not exist in the filesystem but are cancelled by a subsequent dot-dot ("..") element. For example, weakly_canonical("C:\\a\\..") would previously fail if "C:\a" directory did not exist. (#201)
- In read_symlink on Windows, corrected reparse point handling. The operation would return an empty path for some mount points (for example, created by Box cloud storage driver) and directory junction points that had empty print names. The new implementation now parses substitute name of the reparse point and attempts to reconstruct a Win32 path from it. (#187)
- On Windows, file streams provided in boost/filesystem/fstream.hpp will use wide character paths on libc++ versions 7.0 and higher, when the standard library supports opening files with wide character paths. (#181)
- On Windows, creating symlinks should no longer require elevated privileges, if Windows is configured in Developer mode.
- With some compilers, global objects used internally in Boost.Filesystem are now destroyed after user's global destructors are called. This allows to call Boost.Filesystem methods during the program termination stage. In particular, this concerns the path locale that is used for character code conversion and can be installed by calling path::imbue. The supported compilers include MSVC, GCC and Clang, as well as other compilers that support customizing program initialization order through #pragma section (for MSVC-compatible compilers) or __attribute__ ((init_priority)) (for GCC-compatible compilers).
Geometry:
- Improvements
  - PR#812 Umbrella strategies for distance and comparable_distance (undocumented for now).
  - PR#840 Umbrella strategies for various algorithms (undocumented for now).
  - PR#850 Introduced DynamicGeometry and GeometryCollection concepts and support in some algorithms (undocumented for now).
  - PR#855 Various improvements related to strategies. Default strategies are now included with algorithms.
- Solved issues
  - #865 Exception thrown in rtree serialization.
  - #439 Invalid box spherical area computation.
  - #838 Invalid result of union_().
  - #851 Invalid geographic disjoint segment/box result.
  - #861 Invalid result of intersection().
- Bugfixes
  - PR#832 Fixed box spherical and geographic area computation.
  - PR#853 Fixed geographic disjoint segment/box.
  - PR#866 Fixed serialization of rtree containing lesser number of elements in root node than minimum.
  - PR#886 Fixed knn rtree query bug causing it to be slow for big k.
  - Various fixes in set operations and buffer.
JSON:
- value_to supports TupleLike types.
- value_to and value_from support std::array and similar types.
- Implicit conversion operator from string to std::string_view.
- std::hash specializations for json types.
- Fixed allocation errors in object and key_value_pair.
- Fixed crash when constructing array from a pair of iterators that form an empty range.
LexicalCast:
- Fixed assignment to an int of a floating point value that is out of representable range for int.
- Started using GithubActions CI for additional testing
Log:
- Fixed compilation for riscv32 target. (PR#150)
Mp11:
- Added mp_intersperse, mp_split, mp_join
Multi-index Containers:
- Maintenance work.
Nowide:
- Allow for usage of iostream classes before main (best effort, works for most environments)
- Fix initialization of rdbuf in cin/cout/cerr for redirected input/output
- Fix corner case in cin::unget() after using putback()
- Fix possibly delayed close of filebuf after move assignment
- Improve performance of utf8_codecvt
PFR:
- A MurMur Hash based implementation of hash_combine() is now used to reduce collisions count and improve quality of boost::pfr::hash_value()
- Visual Studio 2017 now supported in C++14 mode (thanks to Denis Mikhailov aka @denzor200)
- Issues found by inspect tool were fixed
- Fixed some warnings, including removal of extra semicolons in include/boost/pfr/detail/fields_count.hpp (#72)
- Added a compile time assert for inherited types (thanks to Denis Mikhailov aka @denzor200)
- Reflection of aggregates with non movable fields is now possible if guaranteed copy elision is on
- Fixed spelling issues
- Started using GithubActions CI for additional testing
PropertyTree:
- This is a maintenance release.
- Extend compiler coverage in CI.
- Fix Boost compatibility for CMakeLists.txt.
System:
- The conversion operator from error_category to std::error_category has been improved and no longer requires <map> or <mutex>.
- The comparison operators of error_category are now inline friends instead of member functions (a side effect of the previous change.)
- error_condition now defers calling generic_category() to avoid instantiating the object until it's actually needed.
- error_condition::failed and error_condition::message have been undeprecated, and operator bool() now once again returns failed().
- The system category now doesn't call generic_category(), to avoid instantiating the object.
- The return value of default_error_condition changes in some cases into an error_condition from the generic category, instead of from the system category. This happens on POSIX when the input error_code is from the system category and does not correspond to any errc_t value.
- The interoperability of error_code and std::error_code has been improved substantially. It is now possible to construct boost::system::error_code from std::error_code, and it's possible to pass boost::system::error_code to functions taking std::error_code&.
- A stream insertion operator for error_condition has been added.
Uuid:
- Added to_chars for writing uuid strings without allocating (PR#116)

Updated Tools

Build:
- Includes release of B2 version 4.6.1.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
- Clang, C++11: 3.4, 11.0.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
- Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
- Clang, C++20: 11.0.0, 12.0.0, 13.0.0
- GCC: 4.6.3, 11
- GCC, C++11: 4.7.3, 4.8.5, 11
- GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
- GCC, C++20: 8.0.1, 9.1.0, 10, 11
OS X:
- Apple Clang: 11.0.3
- Apple Clang, C++11: 11.0.3
- Apple Clang, C++14: 11.0.3
- Apple Clang, C++17: 11.0.3
- Apple Clang, C++20: 11.0.3
Windows:
- Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.76.0

Fri, 16 Apr 2021 21:05:27 +0000

New Libraries

No new libraries

Updated Libraries

Asio:
- Added ip::scope_id_type type alias.
- Added ip::port_type type alias.
- Added std::hash specialisations for IP addresses.
- Added std::hash specialisations for ip::basic_endpoint<>.
- Refactored SFINAE usage to improve compile times.
- Added friendship support to customisation points, and made most customisations private.
- Changed any_io_executor to a "strong typedef"-style class.
- Fixed experimental::as_single to work with handler hook deprecation.
- Ensured pthread condition variable attributes are cleaned up on all platforms.
- Clarified thread safety notes on sockets and descriptors.
- Ensured errno is not overwritten if socket() fails on macOS/FreeBSD.
- Fixed work tracking for io_context and thread_pool executors when move-assigned.
- Ensured internal call_stack objects are accessed only from implementation files.
- Fixed I/O object move-assignment to ensure the executor is left in a valid state.
- Fixed detection of compiler support for defaulted template argument on functions with MSVC.
- Prevented the blocking.always property from being used with strand<>, as it did not produce the correct semantics.
- Removed deprecated file asio/impl/src.cpp.
Atomic:
- Fixed compilation with MSVC for ARM. (PR#49)
Beast:
- This update brings minor bug fixes and revamped CI reporting.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Bind:
- Add support for using the standard C++11 placeholders with boost::bind.
- Update boost::apply to use variadic templates and perfect forwarding.
Container:
- Added [[no-discard]] attribute in all containers to catch bugs related to unused return values.
- Replaced default standard exception classes with Boost.Container own classes, reducing considerably the included files overhead. Example: in MSVC 19 boost/container/vector.hpp preprocessed file size reduces from 1,5MB to 930KB. If you still want to use standard exception classes, you can define BOOST_CONTAINER_USE_STD_EXCEPTIONS before using any Boost.Container class.
- Fixed bugs/issues:
Core:
- Add implicit conversion between compatible reference wrappers.
- Add boost/core/cmath.hpp, a portable implementation of the floating point classification functions from <cmath>.
- Add boost/core/bit.hpp, a portable implementation of the C++20 standard header <bit>.
- Fix BOOST_TEST_EQ, BOOST_TEST_NE for character types under C++20.
- Revise allocator access utilities (now support VS2013, and no workarounds use allocator_traits.)
DLL:
- BREAKING CHANGE: boost::dll::import was renamed to boost::dll::import_symbol to avoid collision with C++20 import keyword.
- Updated docs, including FAQ section.
Filesystem:
- Updated compatibility with WASI platform. (PR#169)
- Fixed an exception being thrown by path::remove_filename if the path is "////". (#176)
- Fixed create_directories disregarding errors from file status query operations issued internally. This could result in incorrect error codes returned by create_directories. (#182)
Geometry:
- Improvements
  - PR#670 New IOs to_wkt() and from_wkt() (thanks to Baidyanath Kundu).
  - PR#756 Non cartesian and robust convex hulls.
  - PR#768 Umbrella strategies for relops, setops, index, buffer and more (undocumented for now).
  - PR#797 New azimuth() algorithm.
  - PR#801 Improved accuracy in geographic area computations.
  - PR#820 Parameter scale added to svg_mapper.
- Bugfixes
  - PR#808 Fixed compilation error with rtree serialization enabled (thanks to Tristan Carel).
  - PR#815 Fixed issue in buffer().
  - Various fixes in set operations and buffer.
- Breaking changes
  - Removed strategy convex_hull::graham_andrew.
GIL:
- BREAKING: In next release, we are going to drop support for GCC 5. We will also change the required minimum C++ version from C++11 to C++14.
Histogram:
- This release contains critical fixes, please check that your results are not affected.
- See Release Notes for details.
Intrusive:
- Reduced compile-time dependencies:
 - linear_slist_algorithms use a simple node_ptr instead of std::pair on return.
 - list/slist use operator </operator == instead of std::equal_to/std::less.
- Fixed GitHub #54: set.rbegin() looks like O(log(N))
Interprocess:
- Added wchar_t API support for named resources in operating systems that offer native wide character API (e.g. Windows). The following classes were updated with wchar_t name support:
  - file_mapping
  - managed_mapped_file
  - managed_shared_memory
  - managed_windows_shared_memory
  - shared_memory_object
  - windows_shared_memory_object
  - file_lock
  - named_condition
  - named_condition_any
  - named_mutex
  - named_recursive_mutex
  - named_semaphore
  - named_sharable_mutex
  - named_upgradable_mutex
  - message_queue
- Added BOOST_INTERPROCESS_FORCE_NATIVE_EMULATION macro option to disable the use of generic emulation code for process shared synchronization primitives instead of native POSIX or Winapi functions.
- Fixed bugs:
JSON:
- Security Report from Bishop Fox.
- (#481) Refactored value_from implementation; user customizations are now always preferred over library-provided overloads.
- (#484) Fix imprecise parsing for some floating point numbers.
- (#485) Fix link errors in standalone mode, when used alongside Boost.
- (#497) Fix Boost.Build builds on GCC 4.8.
LexicalCast:
- Dropped dependency on Boost.Math (thanks to Peter Dimov #37, #39).
- Fixes for the CI and coverage (thanks to Sam Darwin from "The C++ Alliance" #38, #42).
Log:
- Bug fixes:
 - Corrected a formal race condition in the thread-safe log record queue implementation used in the unbounded_fifo_queue policy of the asynchronous_sink frontend. The race could be detected by TSAN, but it was not a real problem on most current CPU architectures and compilers. (#139)
 - When copying a logger with a channel attribute (e.g. channel_logger), the channel attribute is now deep-copied from the original logger. This means that modifying the channel in the new logger will no longer affect the original logger.
 - Replaced the use of std::allocator<void> in template parameters with a new tag type boost::log::use_std_allocator to silence libc++ warnings about the former being deprecated in C++17 and later. The tag indicates that the instantiated template should be using a specialization of std::allocator internally to allocate dynamic memory, so the change has no functional effect. (#141)
 - Boost.Log no longer defines __MSVCRT_VERSION__ macro on MinGW and MinGW-w64. Defining this macro caused incompatibility with UCRT, which is available as an option in recent MinGW-w64. (PR#149)
- See changelog for more details.
Math:
- Breaking Change: C++03 support is now removed, a C++11 or later conformant compiler is now required to use this library.
- Added Z-test.
- Added execution policy support to univariate and bivariate statistics: enables parallel execution (requires C++17 and <execution>).
- Big update/improvement on CI testing.
- Bivariate statistics now have integer support.
- T-Test now has integer support.
- Linear regression now has integer support.
- Correct PDF of the beta distribution at the endpoints.
- Correct use of Stirling's approximation in certain multiprecision cases, fixes #396.
- Eliminate -Wimplicit-int-float-conversion on clang.
- Fix some constexpr issues in quaternion/octonion.
- Minor performance fix to tanh_sinh integration.
- Update hypergeometric functions internal scaling to allow for 64-bit (long long) exponents with multiprecision types.
Move:
- Git Issue #35: "New nothrow move traits are incomplete".
Multiprecision:
- BREAKING CHANGE: Massive refactoring and code simplification makes C++11 an absolute requirement.
- Use BOOST_TRY/CATCH in headers so code can be used in exception-free environments.
- Correct corner case in pow, fixes #277.
- Correct exception type thrown to match docs in lsb/msb: fixes #257.
- Allow moves and operators between related but different types (ie types with the same allocator), fixes #278.
Nowide:
- Fix discarding of characters for text file streams when seek or sync functions are used and newlines were converted (e.g. on Windows)
- Fix potential use-after-free bug when reusing (via open) a file stream that has been closed
- Fix potential invalid memory access when using a file stream that has been moved or swapped to where the source had a put-back character or was set to unbuffered mode
- Fix compatibility with ucrt runtime by not defining __MSVCRT_VERSION__
- Known issues: Read performance for text files is degraded. Binary files and writing is unaffected.
Optional:
- Fixed MSVC warning C4702.
Outcome:
- Announcements:
 - BREAKING CHANGE: After a year and three major Boost releases announcing this upcoming change, this is the FIRST RELEASE of the v2.2 branch. This branch has a number of major breaking changes to the Outcome v2.1 which shipped in Boost 1.75 and earlier, see the documentation for details.
- Enhancements:
 - VS2019.8 changed how to enable Coroutines, which caused Outcome to not compile on that compiler.
 - If on C++ 20, we now use C++ 20 [[likely]] instead of compiler-specific markup to indicate when TRY has likely success or failure.
 - BREAKING CHANGE: Previously the value of spare_storage(const basic_result|basic_outcome *) noexcept was not propagated over BOOST_OUTCOME_TRY, which causes things like stack backtraces captured at the point of construction of an errored result to get dropped at every TRY point. This has been fixed by adding an optional spare_storage to success_type<T> and failure_type<T>, as well as to auto success(T &&, ...) and auto failure(T &&, ...).
- Bug fixes:
 - Boost.Outcome should now compile with BOOST_NO_EXCEPTIONS defined. Thanks to Emil, maintainer of Boost.Exception, making a change for me, Boost.Outcome should now compile with C++ exceptions globally disabled. You won't be able to use boost::exception_ptr as it can't be included if C++ exceptions are globally disabled.
 - BREAKING CHANGE #244 It came as a shock to learn that BOOST_OUTCOME_TRY had been broken since the inception of this library for certain corner case code, which required a breaking change in how TRY works. See the changelog in the documentation for more detail.
Parameter:
- Added a workaround for MSVC 2015 code miscompilation when an rvalue was used as a default value of a named parameter of a function. (PR#109, #132)
PFR:
- Fixed reflection of types with missing const in SFINAE expressions in template constructor. Now reflection of aggregates with std::optional<std::chrono::duration<???>> fields works on any Standard Library implementation, even if LWG3050 is not fixed.
- Comparison functions are now constexpr #52
- Fixed numerous typos in docs (thanks to Phil Miller #63)
PolyCollection:
- Worked around GCC bug affecting GCC versions 9.3-10.2 (issue #20).
Predef:
- Version 1.13
- Add ARCH_PPC_64 predef.
- Fix ARCH_WORD_BITS* redefinition warnings/errors.
- Add ARCH_E2K, Elbrus 2000, architecture from Konstantin Ivlev.
- Fix not handling recent C++ version that go above 10.x version.
- Version 1.12
- Switch to using the endian.h header on OpenBSD. (Brad Smith)
- Fix not handling recent versions of stdcxx that go above version 9.
- Fix including sub-BSD OS headers directly causing redef warnings.
- Add CI testing of direct inclusion of all headers.
- Add CI testing on FreeBSD for clang and gcc.
- Add WORD_BITS set of predefs to detect the architecture word size. Initial implementation inspired by submission from Mikhail Komarov.
- Add CI testing for Cygwin 32 and 64.
PropertyTree:
- Property Tree has a new maintainer.
- Fix usage of deprecated Boost.Bind features.
- Link to Wikipedia fixed.
- Use BOOST_OVERRIDE to fix GCC warnings.
- Add extensive CI testing.
Regex:
- Regex is now header only except in C++03 mode.
- Support for C++03 is now deprecated.
- The library can now be used "standalone" without the rest of Boost being present.
Stacktrace:
- Better support for pre-C++11 builds on clang #102.
- Bigger warning for do not use boost::stacktrace::stacktrace in signal handlers #71.
TypeTraits:
- Fix for Visual Studio managed code projects.
Variant2:
- Improved generated code for the double buffered case.

Updated Tools

Build:
- Includes release of B2 version 4.4.1.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0, 11.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.75.0

Fri, 11 Dec 2020 19:50:02 +0000

Known Issues

Boost.Operators is currently incompatible with C++20 compilers, which in some cases may manifest as an infinite recursion or infinite loop in runtime when a comparison operator is called. The problem is caused by the new operator rewriting behavior introduced in C++20. As a workaround, users are advised to target C++17 or older C++ standard. More details can be found in #65.

New Libraries

JSON: JSON parsing, serialization, and DOM in C++11, from Vinnie Falco and Krystian Stasiowski.
- Fast compilation requiring only C++11
- Easy and safe modern API with allocator support
- Compile without Boost, define BOOST_JSON_STANDALONE
- Optional header-only, without linking to a library
LEAF: A lightweight error-handling library for C++11, from Emil Dotchevski.
- Small single-header format, no dependencies.
- Designed for maximum efficiency ("happy" path and "sad" path).
- No dynamic memory allocations, even with heavy payloads.
- O(1) transport of arbitrary error types (independent of call stack depth).
- Can be used with or without exception handling.
PFR: Basic reflection without macro or boilerplate code for user defined types, from Antony Polukhin.

Updated Libraries

Asio:
- Enabled support for UNIX domain sockets on Windows.
- Added executor-converting construction and assignment to ip::basic_resolver.
- Added compatibility between polymorphic executors and the (deprecated) handler invocation hook.
- Added the experimental::as_single completion token adapter.
- Added support for MSG_NOSIGNAL on more platforms by using _POSIX_VERSION to detect whether it is supported.
- Added the ability to compile using libpthread on Windows.
- Added workarounds for the Intel C++ compiler.
- Added more support for detecting and optimising for handlers that have no custom executor.
- Reduced lock contention for timer cancellation on Windows.
- Reinstated a previously removed null-pointer check, as it had a measurable impact on performance.
- Fixed the executor concept to test for a const-qualified execute().
- Fixed any_executor support for builds without RTTI support.
- Fixed the thread_pool unit test to work without RTTI support.
- Fixed C++20 coroutines compatibility with clang on Windows.
- Fixed some compatibility issues with Windows Runtime.
- Fixed shadow name warnings caused by addition of asio::query.
- Fixed a "logical ‘or’ of equal expressions" warning on linux.
- Fixed a benign switch fallthrough warning.
- Added missing push/pop_options.hpp includes.
- Suppressed zero-as-null-pointer-constant warnings.
- Fixed a comma-operator warning.
- Updated the documentation to clarify when the select reactor is used on Windows.
- Fixed potential ambiguity caused by any_executor comparisons and conversion.
- Added detection of non-experimental C++20 coroutines on MSVC 19.8.
- Fixed compatibility with uClibc.
- Fixed strand<> adaptation of Networking TS executors when targeting older C++ versions or less conformant compilers.
- Consult the Revision History for further details.
Atomic:
- Implemented SSE2 and SSE4.1 versions of address lookup algorithm, which is used in the internal lock pool implementation. This may improve performance of waiting and notifying operations in heavily contended cases.
- Fixed a possible compilation error on AArch64 targets caused by incorrect instructions generated for bitwise (logical) operations with immediate constants. (#41)
Beast:
- This update brings bug fixes and support for the BOOST_ASIO_ENBALE_HANDLER_TRACKING compile flag from Boost.Asio:
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Container:
- New devector container.
- Fixed bugs/issues:
  - #152 Tree-based containers have troubles with move-only types.
  - #156 Compile error with vector.
  - PR#157 Add missing include.
  - #159: pmr::monotonic_buffer_resource crashes on large single allocations.
  - #160: Usage of uses_allocator needs a remove_cvref_t.
  - #162: small_vector on MSVC x86 call-by-value crash.
  - #161: polymorphic_allocator(memory_resource*) non-standard extension causes headache.
  - PR#163: container_rebind for small_vector with options.
  - #165: Link error with shared library and memory_resource inline members.
  - PR#166: Fix encoding error in copyright headers.
  - PR#167: error: the address of 'msg' will always evaluate as 'true' warning with GCC 4.4.
  - #169: flood of warnings building dlmalloc_ext_2_8_6.c on clang11.
Endian:
- endian_arithmetic no longer inherits from endian_buffer
- When BOOST_ENDIAN_NO_CTORS is defined, the unaligned endian_buffer and endian_arithmetic are C++03 PODs, to enable use of __attribute__((packed))
Filesystem:
- New: Added creation_time operation, which allows to obtain file creation time. (Inspired by PR#134)
- The returned value of last_write_time(p, ec) operation in case of failure has been changed to a minimal value representable by std::time_t instead of -1.
- The returned value of hard_link_count(p, ec) operation in case of failure has been changed to static_cast<uintmax_t>(-1) instead of 0.
- On POSIX systems, file_size will now indicate error code errc::function_not_supported if the path resolves to a non-regular file. Previously, errc::operation_not_permitted was reported.
- On Linux, many operations now use statx system call internally, when possible, which allows to reduce the amount of information queried from the filesystem and potentially improve performance. The statx system call was introduced in Linux kernel 4.11.
- Removed const-qualification from return types of some path methods. This could prevent move construction and move assignment at the call site in some cases. (#160)
- On OpenBSD 4.4 and newer, use statvfs system call to obtain filesystem space information. (Inspired by PR#162)
- On Windows, space now returns with an error if the provided path does not idendify an existing file. (#167)
Geometry:
- WARNING: Following the deprecation notice of C++03 issued with Boost 1.73, from now on the Boost.Geometry requires a capable C++14 compiler.
- Improvements
 - PR#726 Umbrella strategies for area, envelope, expand (undocumented for now).
 - PR#733 Added example of adaptation of std::array<> to Point concept (thanks to Ben FrantzDale).
 - PR#745 constexpr added in geometries and arithmetic.
 - PR#747 Added optional traits::make (undocumented for now).
 - PR#748 Modernized usage of type traits.
 - PR#759 MPL_ASSERT replaced with standard static_assert.
 - PR#767 Modernized usage of tuple.
- Solved issues
 - #716 Dangling proxy references.
- Bugfixes
 - Various fixes in set operations and buffer.
GIL:
- BREAKING: In next release, we are going to drop support for GCC 5. We may also change the required minimum C++ version from C++11 to C++14.
Histogram:
- This update brings
  - Bug-fixes for corner-cases
  - Small documentation improvements
  - Fixes for new warnings from latest compilers and when compiling against the C++20 standard
- See the full Release Notes for a complete list of changes.
Interprocess:
- Fixed bugs:
  - #127: static assertion failure with boost interprocess 1.74 and basic_managed_shared_memory.
Intrusive:
- Fixed bugs:
  - PR#48: MSVC "assignment within conditional" warning fix.
  - PR#49: Fix empty control statement warnings.
  - #52: Invalid casting in BOOST_INTRUSIVE_BSR_INTRINSIC.
Log:
- Bug fixes:
  - Corrected the file counter that would be used in text_file_backend when generating the target file name (based on the pattern set by set_target_file_name_pattern method) when the log file is rotated. (#125)
  - Replaced a volatile version counter in basic_sink_frontend with an atomic. (#128)
  - In the asynchronous_sink frontend, resolved a possible conflict between flush and run methods, if run is called from a user's thread instead of the internal dedicated thread spawned by the frontend. (#131)
- See changelog for more details.
Move:
- Fixed bugs:
  - #30: (void) C-cast is a non-portable way of suppressing compiler warnings.
Mp11:
- Added mp_pairwise_fold (suggested by Barry Revzin)
- Removed mp_invoke (use mp_invoke_q)
Optional:
- boost::none is constexpr-declared.
- Fixed issue #78.
Outcome:
- Announcements:
  - After a year and three major Boost releases announcing this upcoming change, this is the FINAL RELEASE of the v2.1 branch. From Boost 1.76 onwards, the v2.2 branch becomes the default. This branch has a number of major breaking changes to Outcome v2.1, see the documentation for details.
- Enhancements:
  - The ADL discovered event hooks have been replaced with policy-specified event hooks instead. This is due to brittleness (where hooks would quietly self-disable if somebody changed something), compiler bugs (a difference in compiler settings causes the wrong hooks, or some but not all hooks, to get discovered), and end user difficulty in using them at all. The policy-specified event hooks can be told to default to ADL discovered hooks for backwards compatibility: set OUTCOME_ENABLE_LEGACY_SUPPORT_FOR to less than 220 to enable emulation.
  - Improve configuring OUTCOME_GCC6_CONCEPT_BOOL. Older GCCs had boolean based concepts syntax, whereas newer GCCs are standards conforming. However the precise logic of when to use legacy and conforming syntax was not well understood, which caused Outcome to fail to compile depending on what options you pass to GCC. The new logic always uses the legacy syntax if on GCC 8 or older, otherwise we use conforming syntax if and only if GCC is in C++ 20 mode or later. This hopefully will resolve the corner case build failures on GCC.
- Bug fixes:
  - Boost.Outcome should now compile with BOOST_NO_EXCEPTIONS defined. Thanks to Emil, maintainer of Boost.Exception, making a change for me, Boost.Outcome should now compile with C++ exceptions globally disabled. You won't be able to use boost::exception_ptr as it can't be included if C++ exceptions are globally disabled.
  - #236 In the Coroutine support the final_suspend() was not noexcept, despite being required to be so in the C++ 20 standard. This has been fixed, but only if your compiler implements noop_coroutine. Additionally, if noop_coroutine is available, we use the much more efficient coroutine handle returning variant of await_suspend() which should significantly improve codegen and context switching performance.
Polygon:
- C++20 fixes for event_comparison_type, vertex_equality_predicate_type, and voronoi_predicates. (Glen Fernandes)
Preprocessor:
- When variadic data is empty in C++20 mode with __VA_OPT__ support the variadic size has been corrected to be 0. This also means that in this C++20 mode it is now valid to convert to and from empty arrays and lists and variadic data. The end-user can read the "C++20 Support For Variadic Macros" part of the "variadic macros" topic for more information about empty variadic data in the library.
- The macro BOOST_PP_IS_STANDARD() has been added for identifying if the currently used preprocessor is a C++ standard conforming preprocessor. A number of preprocessors which generally work correctly with the library but need various internal workarounds, including the currently default VC++ preprocessor, are not considered C++ standard conforming preprocessors. However most preprocessors, including among others gcc, clang, and the new but currently non-default VC++ preprocessor in VS2019, are C++ standard conforming preprocessors.
- For C++ standard conforming preprocessors a number of the limits defined in the config/limits.hpp can now be changed to higher amounts for a TU. The end-user should read the "limitations" topic to understand how and which limits can be changed.
- For C++ standard conforming preprocessors, in order to allow the maximum number of FOR and WHILE iterations, the beginning 'r' and 'd' iteration numbers in the user-defined macros start at 1 and not 2, as it did in previous releases. This could be a breaking change if these iteration numbers are used in the user-defined macros ( they probably would not be ), but the change was necessary to fix some arcane bugs when dealing with numerical/logical operations with maximum numbers as well to allow the user-defined macros to be called the correct possible maximum number of times. For non-C++ conforming preprocessors, this change was not made because those non-conforming C++ preprocessors generally have limitations which disallow the maximum number of looping constructs to be run, and it was felt not to introduce a possible breaking change to those more fragile preprocessors would be better. It was also felt that besides fixing some arcane preprocessor bugs and providing the possible maximum number of user-defined macro invocations, this change could be made because it has never been documented what the starting 'r' and 'd' iteration numbers actually are but only that these numbers are incremented for each iteration.
- The library has been upgraded to assume variadic macro support for any compiler working with the library. Ostensibly this means that the library is now a C++11 on up library, yet most of the major compilers, including gcc, clang, and VC++, also support variadic macros in C++98/C++03 mode as long as strict compliance to C++98/C++03 is not turned on when using one of those compilers.
Rational:
- Fix Rational operators to not break under new C++20 operator== rewriting rules. (Glen Fernandes)
Signals2:
- Correct C++ allocator model support to fix compilation in C++20 standards mode. (Glen Fernandes)
System:
- The platform-specific headers windows_error.hpp, linux_error.hpp, and cygwin_error.hpp emit deprecation messages and are slated for removal.
- The old names for generic_category() and system_category() emit deprecation messages and are slated for removal.
- error_condition::failed is deprecated and is slated for removal. operator bool() for error_condition has been reverted to its old meaning of value() != 0. This is done for compatibility with std::error_condition as the next release is expected to improve interoperability with <system_error> even further. Note that this does not affect error_code::failed, which is still alive and well.
- The overload of error_condition::message that takes a buffer is deprecated and is slated for removal, for the same reasons. Note that this does not affect error_code::message.
uBLAS:
- Correct C++ allocator model support to fix compilation in C++20 standards mode. (Glen Fernandes and Conrad Poelman)
VMD:
- The VMD number parsing has been upgraded to support the ability for the end-user to change the number limits in the Preprocessor library.
- The macro BOOST_VMD_IS_GENERAL_IDENTIFIER has been added to support the parsing of input that represents a preprocessor token which matches the VMD identifier syntax, without having to register the identifier as a specific identifier.
Wave:
- Added new C++20 tokens, including the spaceship operator <=>
- Fixed bugs:
 - #94: fix incorrect behavior of __LINE__ and __FILE__ under rescanning

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0, 11.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0, 11.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.74.0

Fri, 14 Aug 2020 05:02:54 +0000

New Libraries

STLInterfaces: A library of CRTP bases to ease the writing of STL views, iterators, and sequence containers, from Zach Laine.

Updated Libraries

Asio:
- Added an implementation of the proposed standard executors (P0443r13, P1348r0, and P1393r0).
- Added support for the proposed standard executors to Asio's I/O facilities.
 - The supplied executors now meet the requirements for the proposed standard executors. These classes also continue to meet the existing requirements for the Networking TS model of executors.
 - All I/O objects, asynchronous operations, and utilities will interoperate with both new proposed standard executors, and with existing Networking TS executors.
 - The any_io_executor type alias has been introduced as the default runtime-polymorphic executor for all I/O objects. This defaults to the execution::any_executor<> template. If required for backward compatibility, BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT can be defined to use the old asio::executor polymorphic wrapper instead.
 - Support for the existing Networking TS model of executors can be disabled by defining BOOST_ASIO_NO_TS_EXECUTORS.
- Added converting move construction and assignment to basic_waitable_timer.
- Enabled C++20 coroutine support when using gcc 10.
- Added overloads of co_spawn that launch an awaitable.
- Added a new constructor overload to use_awaitable_t's default executor adapter, to enable conversion between executor types.
- Added support for using detached_t as a default completion token, by adding members as_default_on() and as_default_on_t<>.
- Added a move constructor to ssl::stream<>.
- Changed ssl::stream<> write operations to linearise gather-write buffer sequences.
- Added compile-time detection of the deprecated asio_handler_invoke, asio_handler_allocate, and asio_handler_deallocate hooks, when BOOST_ASIO_NO_DEPRECATED is defined.
- Implemented a number of performance optimisations.
- Added source location support to handler tracking.
- Implemented various improvements to the handlerviz.pl tool.
- Added the handlerlive.pl tool, which processes handler tracking output to produce a list of "live" handlers.
- Added the handlertree.pl tool, which filters handler tracking output to include only those events in the tree that produced the nominated handlers.
- Added changes for clang-based Embarcadero C++ compilers.
- Fixed a deadlock that can occur when multiple threads concurrently initialise the Windows I/O completion port backend.
- Fixed async_compose to work with copyable handlers when passed by lvalue.
- Fixed completion signature deduction in co_spawn.
- Removed a spurious Executor base class from the executor_binder implementation.
- Various fixes and improvements in the documentation and examples.
- Consult the Revision History for further details.
Atomic:
- Added missing const qualifiers to some operations in atomic_ref.
- Added support for yield instruction on ARMv8-A. The instruction is used internally in spin loops to reduce CPU power consumption.
- Added support for C++20 waiting and notifying operations. The implementation includes generic backend that involves the internal lock pool, as well as specialized backends for Windows, Linux, FreeBSD, DragonFly BSD and NetBSD. Atomic types provide a new method has_native_wait_notify, a static boolean constant always_has_native_wait_notify and a set of capability macros that allow to detect if the implementation supports native waiting and notifying operations for a given type.
- Changed internal representation of atomic_flag to use 32-bit storage. This allows for more efficient waiting and notifying operations on atomic_flag on some platforms.
- Added support for build-time configuration of the internal lock pool size. The user can define the BOOST_ATOMIC_LOCK_POOL_SIZE_LOG2 macro to specify binary logarithm of the size of the lock pool. The default value is 8, meaning that the size of the lock pool is 256, up from 64 used in the previous release.
- Added support for a new set of atomic types dedicated for inter-process communication: ipc_atomic_flag, ipc_atomic and ipc_atomic_ref. Users are recommended to port their code using non-IPC types for inter-process communication to the new types. The new types provide the same set of operations as their non-IPC counterparts, with the following differences:
  - Most operations have an added precondition that is_lock_free returns true for the given atomic object. The library will issue a compile time error if this precondition is known to be not satisfied at compile time.
  - All provided operations are address-free, meaning that the atomic object (in case of ipc_atomic_ref - the referenced object) may be located in process-shared memory or mapped into the same process at multiple different addresses.
  - The new has_native_wait_notify operation and always_has_native_wait_notify constant indicate support for native inter-process waiting and notifying operations. When that support is not present, the operations are implemented with a busy loop, which is less efficient, but still is address-free. A separate set of capability macros is also provided to indicate this support.
- Added new atomic_unsigned_lock_free and atomic_signed_lock_free types introduced in C++20. The types indicate the atomic object type for an unsigned or signed integer, respectively, that is lock-free and preferably has native support for waiting and notifying operations.
- Added new gcc assembler backends for ARMv8-A (for both AArch32 and AArch64). The new backends are used to implement operations not supported by compiler intrinsics (including 128-bit operations on AArch64) and can also be used when compiler intrinsics are not available. Both little and big endian targets are supported. AArch64 backend supports extensions defined in ARMv8.1 and ARMv8.3.
- Added support for big endian targets in the legacy ARM backend based on gcc assembler blocks (this backend is used on ARMv7 and older targets). Previously, the backend assumed little endian memory layout, which is significant for 64-bit operations.
- Improved performance of seq_cst stores and thread fences on x86 by using lock-prefixed instructions instead of mfence. This means that the operations no longer affect non-temporal stores, which was also not guaranteed before. Use specialized instructions and intrinsics to order non-temporal memory accesses.
- Fixed capability macros for 80-bit long double on x86 targets not indicating lock-free operations even if 128-bit atomic operations were available.
- Fixed compilation of gcc asm blocks on Alpha targets.
- In the gcc __sync* intrinsics backend, fixed that store and load operations of large objects (larger than a pointer size) could be non-atomic. The implementation currently assumes that small objects can be stored with a single instruction atomically on all modern architectures.
Beast:
- This update brings bug fixes and support for the following changes changes in Boost.Asio:
- Beast supports BOOST_ASIO_NO_DEPRECATED. Define this to help identify areas of your Beast and Asio code which use deprecated Asio interfaces.
- Beast also supports BOOST_ASIO_NO_TS_EXECUTORS. Define this to identify uses of executors from the now potentially outdated Networking TS
- Asio will use the Standard Executors model by default. You can prevent this behaviour by defining BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT in which the Networking TS model will be used by default. Setting this flag does not prevent a program from using executors from the Standard Executors model explicitly.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Bimap:
- Correct allocator usage (fixes C++20 compilation). (Glen Fernandes)
Config:
- Implement BOOST_NO_CXX11_OVERRIDE and BOOST_OVERRIDE. (Glen Fernandes)
Core:
- Implemented the allocator access utilities which provide a replacement for allocator_traits with individual traits and functions for each facility. They support the C++11 allocator model when possible and provide a fallback for C++98 compatibility. These are now used in Circular_Buffer, Wave, Lockfree, Heap, Smart_Ptr, Dynamic_Bitset, Format, Bimap and more. (Glen Fernandes)
DLL:
- Multiple fixes for the library_info work on empty shared objects.
- Compilation fixes for C++98 and C++11 modes (#28).
- Fixes for smart_library manglings (thanks to XiaLiChao82 #37).
Endian:
- Enabled scoped enumeration types in endian_reverse.
- Enabled bool, enum, float, double in endian_reverse_inplace.
- Added an overload of endian_reverse_inplace for arrays.
Filesystem:
- Removed compile-time checks for support for symlinks and hardlink on Windows. Instead, a runtime check is used. (PR#142)
- Fixed handling of reparse points in canonical and read_symlink on Windows. This also affects other algorithms that involve canonical and read_symlink in their implementation. (PR#100, #85, #99, #123, #125)
- Fixed that read_symlink on Windows could potentially fail or cause failures elsewhere with a sharing violation error, if the same symlink was opened concurrently. (#138)
- Fixed that is_symlink(directory_entry) would always return false, even if the directory entry actually referred to a symlink. (PR#148)
- Added missing status inspection operation overloads for directory_entry and error_code (e.g. is_directory(directory_entry, error_code&)). Removed incorrect noexcept specifications for the overloads not taking the error_code arguments.
- copy_file implementation has been updated to perform checks on the source and target files, as required by C++20 ([fs.op.copy.file]/4.1). In particular, the operation will fail if the source or target file is not a regular file or the source and target paths identify the same file.
- copy_file on POSIX systems will now also copy the source file permissions to the target file, if the target file is overwritten.
- New: Added copy_file implementations based on sendfile and copy_file_range system calls on Linux, which may improve file copying performance, especially on network filesystems.
- Deprecated: The copy_option enumeration that is used with the copy_file operation is deprecated. As a replacement, the new enum copy_options (note the trailing 's') has been added. The new enum contains values similar to the copy_options enum from C++20. The old enum values are mapped onto the new enum. The old enum will be removed in a future release.
- New: Added copy_options::skip_existing option, which allows copy_file operation to succeed without overwriting the target file, if it exists.
- New: Added copy_options::update_existing option, which allows copy_file operation to conditionally overwrite the target file, if it exists, if its last write time is older than that of the replacement file.
- New: copy_file now returns bool, which indicates whether the file was copied.
- New, breaking change: copy operation has been extended and reworked to implement behavior specified in C++20 [fs.op.copy]. This includes support for copy_options::recursive, copy_options::copy_symlinks, copy_options::skip_symlinks, copy_options::directories_only, copy_options::create_symlinks and copy_options::create_hard_links options. The operation performs additional checks based on the specified options. Applying copy to a directory with default copy_options will now also copy files residing in that directory (but not nested directories or files in those directories).
- New: Added create_directory overload taking two paths. The second path is a path to an existing directory, which is used as a source of permission attributes to use in the directory to create.
- Deprecated: copy_directory operation has been deprecated in favor of the new create_directory overload. Note that the two operations have reversed order of the path arguments.
- equivalent on POSIX systems now returns the actual error code from the OS if one of the paths does not resolve to a file. Previously the function would return an error code of 1. (#141)
- equivalent no longer considers file size and last modification time in order to test whether the two paths refer to the same file. These checks could result in a false negative if the file was modified during the equivalent call.
- New: Added absolute overloads taking error_code argument.
- Operations that have current_path() as the default value of their arguments and also have an error_code argument will use the current_path(error_code& ec) overload to obtain the current path, so that its failure is reported via the error_code argument instead of an exception.
- space now initializes the space_info structure members to -1 values on error, as required by C++20 ([fs.op.space]/1).
- space on Windows now accepts paths referring to arbitrary files, not only directories. This is similar to POSIX systems and corresponds to the operation description in C++20. (#73)
- New: Added implementation of temp_directory_path for Windows CE. (PR#25)
- New: Improved compatibility with WASI platform. (PR#144)
- New: Improved support for Embarcadero compilers. (PR#130)
- New: Added implementations of unique_path operation based on getrandom (Linux), arc4random_buf (OpenBSD/FreeBSD/CloudABI) and BCrypt (Windows) system APIs.
- Deprecated: Auto-linking against system libraries on Windows with MSVC-compatible compilers is deprecated and will be removed in a future release. This affects users linking against static library of Boost.Filesystem. Users are advised to update their project build systems to either use a shared library of Boost.Filesystem, or explicitly specify the dependencies of Boost.Filesystem in the linker command line. Users of shared library of Boost.Filesystem are not affected.
Flyweight:
- Maintenance work.
Format:
- Correct allocator usage (fixes C++20 compilation). (Glen Fernandes)
Geometry:
- Improvements
  - PR#720 Additional R-tree constructors (thanks to Caian Benedicto).
  - Various improvements in buffer, set and relational operations.
- Solved issues
  - #709 memcpy called for object with no trivial copy-assignment.
  - #721 Compilation error in bgi::detail::rtree::visitors::insert.
  - #727 MSVC warning: conditional expression is constant.
- Bugfixes
  - PR#700 Missing cases for default strategies in distance algorithm.
  - PR#738 Longitudes out of range in direct geodesic formulas.
GIL:
- Added
 - Added new constructor initializing any_image from r-value reference to any image (PR#486).
 - Implemented mechanism to reverse kernel_2d (PR#489).
- Changed
 - BREAKING: Replace Boost.Variant with Boost.Variant2 (PR#474) which completes removal on uses of Boost.MPL (missing from Boost 1.72.0 change added PR#274).
 - Use perfect forwarding from apply_operation to visit (PR#491).
- Removed
 - BREAKING: Removed dependency on Boost.Variant
- Fixed
 - Fixed invalid conversion from RGB8 to CMYK32 due to overflow (PR#470).
 - Fixed image constructor from other image (PR#477).
 - Fixed error plane_view_t is not a class or namespace name (PR#481).
 - Fixed interleaved_view factory using point<std::ptrdiff_t> for dimension (PR#487).
 - Fixed documentation replacing uses MPL with MP11 in tutorial (PR#494).
 - Fixed missing header in numeric/kernel.hpp to make it self-contained (PR#502).
- Acknowledgements
 - Samuel Debionne, Pranam Lashkari, Mateusz Loskot, Debabrata Mandal
Heap:
- Correct destruction of top node in skew_heap. (Glen Fernandes)
- Correct and simplify allocator use. (Glen Fernandes)
Integer:
- Fixed compilation of gcd in C++20 mode with clang 10.
- Improved support for Embarcadero compilers. (PR#21)
Iterator:
- boost/function_output_iterator.hpp header is now deprecated. Users should replace its inclusion with boost/iterator/function_output_iterator.hpp. (PR#51)
- Improved support for Embarcadero compilers. (PR#55)
LexicalCast:
- Fixed warnings on missing override (thanks to EugeneZelenko #35, #34).
- Fixes for the the Embarcadero compilers (thanks to Edward Diener).
Log:
- Bug fixes:
  - The syslog sink backend now verifies the IP version of the local and target addresses set by user. The addresses must have the same IP version as was specified in the ip_version named parameter on the sink backend construction (by default, IPv4 is assumed). When an address is obtained as a result of host name resolution, only addresses with matching IP version are considered. (#119)
- New Features:
  - Move constructors and assignment operators of various components were marked noexcept.
  - Added a new range_manip stream manipulator that can be used for outputting elements of a range, optionally separated by a delimiter.
  - Added a new tuple_manip stream manipulator that can be used for outputting elements of a tuple or any other heterogeneous sequence, optionally separated by a delimiter.
  - Added a new optional_manip stream manipulator that can be used for outputting optionally present values.
- See changelog for more details.
Mp11:
- Improved compilation performance of mp_with_index<N> for large N.
- Added tuple_transform (contributed by Hans Dembinski.)
Multi-index Containers:
- Added node extraction and insertion following the analogous interface of associative containers as introduced in C++17. This feature has also been extended to non key-based indices, in contrast to C++ standard library sequence containers, which do not provide such functionality.
- Clarified documentation on read/write key extractors (issue #32).
- Maintenance work.
Nowide:
- The library now requires a C++11-compliant compiler and stdlib
- LFS: Add support for files > 2 GB where the underlying system supports it
- Generic UTF conversion functions are now available in the boost::nowide::utf namespace
- Add support for stat with UTF-8 paths
Outcome:
- Announcements:
 - The v2.1 branch is expected to be retired end of 2020, with the v2.2 branch becoming the default. You can use the future v2.2 branch now using better_optimisation. This branch has a number of major breaking changes to Outcome v2.1, see the front page for details.
- Enhancements:
 - BREAKING CHANGE void results and outcomes no longer default construct types during explicit construction. Previously if you explicitly constructed a result<T> from a non-errored result<void>, it default constructed T. This was found to cause unhelpful surprise, so it has been disabled.
 - New macro OUTCOME_ENABLE_LEGACY_SUPPORT_FOR. The macro OUTCOME_ENABLE_LEGACY_SUPPORT_FOR can be used to enable aliasing of older naming and features to newer naming and features when using a newer version of Outcome.
 - Concepts now have snake case style naming instead of camel case style. When Outcome was first implemented, it was thought that C++ 20 concepts were going to have camel case style. This was changed before the C++ 20 release, and Outcome's concepts have been renamed similarly. This won't break any code in Outcome v2.1, as compatibility aliases are provided. However code compiled against Outcome v2.2 will need to be upgraded, unless OUTCOME_ENABLE_LEGACY_SUPPORT_FOR is set to 210 or lower.
 - Concepts now live in OUTCOME_V2_NAMESPACE::concepts namespace. Previously concepts lived in the convert namespace, now they live in their own namespace.
 - New concepts basic_result<T> and basic_outcome<T> added. End users were finding an unhelpful gap in between is_basic_result<T> and value_or_error<T> where they wanted a concept that matched types which were basic_result, but not exactly one of those. Concepts filling that gap were added.
 - Operation TRY works differently from Outcome v2.2 onwards. This is a severely code breaking change which change the syntax of how one uses OUTCOME_TRY(). A regular expression suitable for upgrading code can be found in the list of changes between Outcome v2.1 and v2.2.
- Bug fixes:
 - #224 The clang Apple ships in Xcode 11.4 (currently the latest) has not been patched with the fixes to LLVM clang that fix noexcept(std::is_constructible<T, void>) failing to compile which I originally submitted years ago. So give up waiting on Apple to fix their clang, add a workaround to Outcome.
 - Spare storage could not be used from within no-value policy classes. Due to an obvious brain fart when writing the code at the time, the spare storage APIs had the wrong prototype which prevented them working from within policy classes. Sorry.
PolyCollection:
- Fixed internal ambiguity problem between boost::type_erasure::any and boost::any (issue #17).
- Maintenance work.
SmartPtr:
- Added owner_equals to shared_ptr, weak_ptr, local_shared_ptr.
- Added owner_hash_value to shared_ptr, weak_ptr.
- Added owner_equal_to, owner_hash.
- Added std::hash specializations for shared_ptr, local_shared_ptr.
- Added boost::hash support to, and std::hash, std::equal_to specializations for, weak_ptr.
Stacktrace:
- Fixed a build error when compiled with -fno-exceptions (thanks to Jeremiah Rodriguez #91).
System:
- operator bool() now returns failed() instead of value() != 0.
Type_Traits:
- Implemented conjunction, disjunction, negation, is_trivially_copyable, is_scoped_enum, and is_unscoped_enum. (Glen Fernandes)
Variant:
- Fixed warnings on missing override (thanks to EugeneZelenko #78).
- Fixes for the the Embarcadero compilers (thanks to Edward Diener #79).
- Updated header locations to avoid warnings about using deprecated headers (thanks to Andrey Semashev #80)
Variant2:
- Added support for derived types in visit.
- Improved compilation performance for many (hundreds of) alternatives.
- Added support for visit<R>.
Wave:
- Implement C++20 features for variadics, including __VA_OPT__ (PR#75)
- Implement __has_include (PR#102)
- Introduce new sample: check_macro_naming, useful with Boost itself (PR#97)
- Fix compilation issue caused by std::allocator member removal in C++20 (PR#72)
- Repair Xpressive lexer and token_statistics sample (PR#79)
- Repair lexertl lexer (PR#78)
- Ensure hooks are run on predefined macros as well (PR#87)
- Various minor bug fixes
- C++98/03 support is now deprecated and will be removed in 1.77
YAP:
- Fixed compilation errors for placeholders; they now work in the general case, and in particular work with yap::print().
- constexpr all the YAP.
- Fix printing of correct value category in yap::print().
- Doc clarification.

Updated Tools

Boostbook:
- Change encoding of generated documentation from US-ASCII to UTF-8. (Glen Fernandes)

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.73.0

Tue, 28 Apr 2020 03:57:05 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release. Be careful as they have not been through the normal testing process.

Outcome status_code_domain assertion removal
- Outcome patch
Beast and coroutines
- Beast patch

New Libraries

Nowide: Standard library functions with UTF-8 API on Windows, from Artyom Beilis.
StaticString: A dynamically resizable string of characters with compile-time fixed capacity and contiguous embedded storage, from Vinnie Falco and Krystian Stasiowski

Updated Libraries

Align:
- Update aligned_alloc to support older mingw32.
Any:
- Speedup compilation by not including <algorithm>.
- Maintenance work, including CI hardening.
Asio:
- Fixed compatibility with C++20 concept syntax.
- Marked the POSIX descriptor classes' move constructors as noexcept.
- Added the ssl::host_name_verification class, which is a drop-in replacement for ssl::rfc2818_verification. The ssl::rfc2818_verification class has been marked as deprecated. As a consequence of this change, SSL support now depends on functions that were introduced in OpenSSL 1.0.2.
- Added an ssl::context constructor to take ownership of a native handle.
- Changed C++ language version detection with gcc to use __cplusplus macro.
- Fixed a work counting issue in the asynchronous resolve operation for endpoints.
- Fixed the strand<> converting constructors and assignment operators.
- Ensured that resolvers are restarted correctly after a fork.
- Fixed compatibility with the current NetBSD release.
- Removed spurious handler requirement checks in some async_read overloads.
- Changed the ssl::context class to propagate non-EOF errors from the add_certificate_authority function.
- Fixed a Windows-specific thread_pool destructor hang that occurred when the pool had an associated I/O object.
- Changed the select reactor to recreate the "self pipe trick" sockets on error. This addresses an issue on some versions of Windows, where these sockets are discconected after a system sleep.
- Fixed a compile error in the buffered streams due to the lack of reference collapsing in C++98.
- Changed the priority_scheduler example to demonstrate calls to shutdown() and destroy().
- Removed some unnecessary null pointer checks.
- Changed Windows platform detection to recognise TV titles as Windows apps.
- Added some emscripten compatibility patches.
- Fixed a compile error in the use_awaitable_t::as_default_on function.
- Changed all uses of the boost.bind placeholders to use the boost::placeholders namespace.
- Fixed a potential compile error in the async_compose implementation due to incorrect overload selection.
- Suppressed some non-virtual destructor warnings.
- Various documentation fixes and improvements.
Assert:
- Added source_location.
Atomic:
- Implemented C++20 atomic_ref. See docs and especially the caveats section.
- Implemented atomic_flag::test operation, which was introduced in C++20.
- atomic<T> should now take into account alignment requirements of T, which makes a difference if those requirements are higher than that of the internal storage of atomic.
- Added static asserts enforcing the requirements on the value type T used with atomic and atomic_ref. This should prohibit invalid types from being used as atomics.
- Improved internal lock pool implementation. The pool is larger, and lock selection accounts for atomic object alignment, which should reduce the potential of thread contention.
- Fixed incorrect x86 code generated for bit_test_and_* operations on 8 and 16-bit arguments. Other architectures are not affected.
- Fixed a possible unaligned memory access in compare_exchange_* operations, if alignment requirements of value_type are less than that of the internal storage of atomic.
- boost/atomic/atomic.hpp no longer includes boost/atomic/atomic_flag.hpp and boost/atomic/fences.hpp and only defines the boost::atomic class template and related typedefs. Include the other headers explicitly or use boost/atomic.hpp to include all parts of Boost.Atomic.
- The atomic<T>::storage() accessor and associated atomic<T>::storage_type type are deprecated. Instead, users are advised to use atomic<T>::value() and atomic<T>::value_type, respectively. Users can define BOOST_ATOMIC_SILENCE_STORAGE_DEPRECATION to disable deprecation warnings for the time of transition. The deprecated pieces will be removed in a future release.
- Removed support for BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST. This macro was used as a helper for transition to the updated returned values of *_and_test operations in Boost.Atomic 1.67, which was released 2 years before 1.73.
Beast:
- This is a maintenance update.
- Nested mutable_data_type in Beast dynamic buffers is deprecated.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Context:
- #133: IBM Z: Fix fcontext routines
- #132: mips64/n64: .align 3
- #131: Use OSPLAT MIPS32/MIPS64 to set different ABI
- #129: Fix non-PIC in RISC-V assembly
Conversion:
- Added boost::polymorphic_downcast for references (thanks to Julien Delacroix for the patch).
- Significant docs update.
date_time:
- #123: Support constexpr in c++14 and above
- #134: Make date_time all inline. Users no longer need to link the library for any functions. Library remains for build compatibility.
- #132: Deprecate support for legacy io and USE_DATE_TIME_PRE_1_33_FACET_IO macro
- Misc documentation updates and bugfixes.
DLL:
- Fixes and tests for demangling in boost::dll::smart_library (thanks to Ramil Gauss for #35).
- Make UB sanitizers happy with boost::dll::load_mode::type #30.
- Ceased dependence on MPL improving compile times (thanks to Nikita Kniazev for #34).
- Clang and ICC on Windows fixes and CI support for those platforms (thanks to Nikita Kniazev #33).
- Maintenance work, including CI hardening and tests improving.
Dynamic Bitset:
- Fixed a portability issue in the definition of the maximum block limit.
Flyweight:
- Maintenance work.
Geometry:
- Improvements
  - PR#650 Missing input combinations in intersection() and introduction of tupled-output.
  - PR#671 Added d3::point_xyz geometry model (thanks to Digvijay Janartha).
- Solved issues
  - #657 Incorrect definition of EPSG:3785.
- Bugfixes
  - PR#639 R-tree exception-safety improvement.
  - PR#668 Andoyer inverse formula fixed for close points.
  - PR#687 Fixed dangling reference in distance algorithm.
- Deprecation
  - #590 Support for C++03 has been deprecated and Geometry will require C++14 from Boost 1.75 onwards.
GIL:
- Added
  - Added move constructor and move assignment operator to image class (PR#457).
  - New member function size() in any_image_view class (PR#456).
- Changed
  - Replace Boost.Test with Boost.LightweightTest as the only test framework used in GIL (PR#459) and (PR#464). This also restructured the test/extension/io/ sub-tree and targets in related Jamfile-s.
  - Removed remaining uses of Boost.MPL (PR#459).
  - Renamed all macros using BOOST_GIL_ prefix (PR#411).
  - Renamed all CMake configuration options using BOOST_GIL_ prefix (PR#419).
- Changed
  - Removed extension/dynamic_image/reduce.hpp as unused and possibly unfinished (PR#466). An implementation attempt of techniques described in the paper Efficient Run-Time Dispatching in Generic Programming with Minimal Code Bloat by Lubomir Bourdev, Jaakko Jarvi.
  - Removed direct dependency on Boost.MPL, Boost.System and Boost.Test.
  - Started removing public macros for compile-time configuration of I/O extension tests, i.e. BOOST_GIL_IO_TEST_ALLOW_READING_IMAGES and BOOST_GIL_IO_TEST_ALLOW_WRITING_IMAGES. Instead, if a test target is built, it builds all its test cases unconditionally.
- Fixed
  - Avoid longjmp interaction during destruction of I/O extension objects (PR#433).
  - Fixed missing alignment default value in constructor of image class (PR#429).
  - Fixed segmentation fault when reading corrupted PNG file (PR#414).
  - Fixed illegal initialization of return values in the old IOv1 interface of I/O extension (PR#409).
- Acknowledgements
  - Samuel Debionne, Thiago Henrique Hüpner, Pranam Lashkari, Mateusz Loskot, Debabrata Mandal, Olzhas Zhumabek
Histogram:
- New features
  - Added crop command to reduce algorithm
  - slice command in reduce now works on category axis
  - Added count accumulator, can be used to add arbitrary metadata to each cell
  - sum algorithm gained a new argument to optionally sum only over inner bins
- Several fixes for bugs in corner cases
- Enhanced documentation
  - How to use Boost.Histogram as a backend in an external API
  - More on how to use Boost.Histogram with custom accumulators and Boost.Accumulators
  - More on how to use reduce
  - Updated benchmarks
- See the full changelog here
icl:
- PR#23: Remove references to date_time compiled library.
- PR#17: Fix forward decl lower and upper less equal.
- Misc bugfixes.
IO:
- Made all the IOS state saver classes non-copyable. (Glen Fernandes)
- Correctly handle error upon first read from the input stream when reading a quoted string. (Glen Fernandes)
- Implemented ostream_joiner for delimiter based joining. (Glen Fernandes)
- Relocated ostream_string from the Utility library to the IO library as ostream_put.
- Correctly handle stream width and fill in quoted output. (Glen Fernandes)
- Optimize quoted output to write directly to the stream buffer. (Glen Fernandes)
- Glen Fernandes became the maintainer of the IO library.
LexicalCast:
- Maintenance work, including CI hardening and better workarounds for broken standard libraries (thanks to Nikita Kniazev #31, #32).
Log:
- New Features:
  - Default sink used in trivial logging, when no sinks are registered in the logging core, now automatically flushes output after each log record. (#103)
  - core::flush now performs a flush on the default sink used for trivial logging, when no sinks are registered.
- Bug fixes:
  - Added a workaround for some syslog API implementations (e.g. glibc), which do not save the application identification string in openlog call. Such implementations could access already freed memory on each syslog call, resulting in undefined behavior. (#97)
  - Fixed that log file rotation on a specific day of month (e.g. rotation_at_time_point(boost::gregorian::greg_day(1))) could be silently ignored and not happen. (#98)
  - Fixed that text_file_backend::rotate_file could throw if there were no log records written yet and target file name pattern was set.
  - Ported various components of the library to std::allocator_traits to improve compatibility with C++20 allocators.
  - Fixed compilation errors when building in MSYS2 Cygwin environment. (#102)
- See changelog for more details.
Math:
- IMPORTANT: C++03 support is now deprecated and will be removed from March 2021.
- Added Cubic Hermite Interpolation.
- Added Modified Akima Interpolation.
- Added PCHIP Interpolation.
- Added Quintic Hermite Interpolation.
- Added entropy to numerous distributions.
- Allow trivial quadrature case where the two end points are equal, and in addition allow bounds to be interchanged.
- Fix exp_sinh quadrature to work with complex types over a non-native range.
- Fix miscellaneous compiler warnings in factorial.hpp.
- Use std::chrono rather than boost::chrono in timed pFq calculations.
- Remove much of the old boost::mpl dependencies to improve constexpr support.
Mp11:
- Added mp_unique_if (contributed by Kris Jusiak)
- Added mp_flatten
- Added mp_rotate_left, mp_rotate_right (contributed by Duncan Barber)
- Added mp_compose
- Added mp_power_set
- Added mp_partial_sum
- Added mp_iterate
Multi-index Containers:
- multi_index_container is now AllocatorAware.
- Swapping of internal KeyFromValue, Compare, Hash and Pred objects now selects the appropriate swap function between std::swap and ADL candidates, in accordance with standard specifications in [swappable.requirements] (issue #29).
- Provided some internal copy constructors and assignment operators whose default implicit definition is deprecated in C++11 onwards ([depr.impldec]), which was warned about on some compilers.
- Maintenance work.
Multiprecision:
- IMPORTANT: Mark C++03 support as deprecated and due for removal in 2021.
- Big update to cpp_int adds faster Karatsuba and Coomba multiplication routines.
- Fix conversion of gmp_rational to long double and __float128, fixes #178.
- Fix up libtommath support to function with the latest libtom releases.
- Fix up some incompatibilities with the latest Intel C++ compiler.
- Fix up constexpr arithmetic support for latest MSVC release.
Outcome:
- Enhancements:
  - Performance of Outcome-based code compiled by clang has been greatly improved. The previous implementation of Outcome's status bitfield confused clang's optimiser, which caused low quality codegen. Unlike most codegen issues, this was noticeably in empirical benchmarks of real world code, as was shown by P1886 Error speed benchmarking.
  - The safe part of the better_optimisation Outcome v2.2.0 future branch was merged to Outcome v2.1.3 which includes a new status bitfield implementation. This appears to not confuse clang's optimiser, and clang 9 produces code which routinely beats GCC 9's code for various canned use cases.
  - Installability is now CI tested per commit. Due to installability of standalone Outcome (e.g. make install) breaking itself rather more frequently than is ideal, installability is now tested on CI per commit.
- Bug fixes:
  - #214 Newer Concepts implementing compilers were unhappy with the early check for destructibility of T and E, so removed template constraints, falling back to static assert which runs later in the type instantiation sequence.
  - #220 A false positive undefined behaviour sanitiser failure in some use cases of Experimental Outcome was worked around to avoid the failure message.
PolyCollection:
- Suppressed a potential redundant move warning in boost::poly_collection::for_each.
- Fixed a bug by which elements were copied rather than moved in allocator-extended move construction and move assigment between collections with non-propagating, unequal allocators.
- Allocator-extended move construction no longer decays to allocator-extended copy construction for the legacy version of libstdc++-v3 shipped with GCC 4.8 (which can also be used by Clang).
Stacktrace:
- Added documentation on distribution of PDBs #55, #47 (thanks to emptyVoid and Roger Orr for information and to zlojvavan for testing).
- Fixed msvc-9 build
- Maintenance work, including test fixes #86, fixing typos #84, CI improvements and hardening, inspect tool fixes.
Test:
- Boost.test v3.13 see the Changes log for more details.
- New feature: It is now possible to combine tolerance indication, user message and collection comparison modifier in a single BOOST_TEST expression. See change logs for more details.
- Bug fixes and pull requests:
  - GitHub Issues: #173, #179, #220, #221, #235 #237, #241, #245, #246, #251, #253 #254, #263
  - Trac tickets: #11107
  - GitHub Pull Requests: PR#41, PR#114, PR#187, PR#239, PR#247 PR#252, PR#259, PR#265
ThrowException:
- Added an overload of throw_exception that takes a boost::source_location object.
- NOTE: Projects using BOOST_THROW_EXCEPTION with exceptions disabled will need to add a definition of this new overload.
TTI:
- Added introspection of function templates for more recent C++ compilers versions from gcc and vc++. as well as all versions of clang. Older versions of vc++ before 14.0 and gcc prior to 4.8 may fail.
- Added specific introspection for elements of struct/class, enum, and union types, which can be used for more fine-grained introspection than the general 'type' introspection.
TypeIndex:
- Maintenance work, including CI integration with inspect tool.
Utility:
- The ostream_string facility has moved from the Utility library to the IO library as ostream_put.
Variant:
- Removed unused includes (thanks to Nikita Kniazev #74).
- Fixed zero-as-null-pointer-constat warnings (thanks to Bart Siwek #77).
- Maintenance work, including typo fixes.
Variant2:
- Added support for std::hash, boost::hash.
- variant<T...> is now trivial when all types in T... are trivial. This improves performance by enabling it to be passed to, and returned from, functions in registers.
WinAPI:
- Headers in boost/detail/winapi are deprecated and will be removed in a future release.
- Boost.WinAPI headers no longer include winerror.h. Include boost/winapi/error_codes.hpp to get Windows error codes. (#81)

Updated Tools

Build:
- Includes release 4.2.0 of B2.
- WARNING: Since version 4.0.0 B2 requires a capable C++11 compiler to bootstrap. This is only needed to build B2 itself not to build Boost for your use.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow, Michael Caisse and Glen Fernandes managed this release.

Version 1.72.0

Wed, 11 Dec 2019 18:06:09 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release. Be careful as they have not been through the normal testing process.

Revert cease dependence on range
- Coroutine patch

Updated Libraries

Asio:
- Changed the async_initiate helper function to automatically deduce its return type, for C++11 or later.
- Changed all asynchronous operations to use automatically deduced return types, for C++14 or later.
- Introduced concepts to support async_initiate.
- Added the nested template type rebind_executor to all I/O object types.
- Changed the initiation function objects to report their associated I/O executor via the nested type executor_type and member function get_executor().
- Added the default_completion_token trait, giving I/O executor types an associated default completion token type for use with asynchronous operations. This trait is specialised for the use_awaitable completion token, for example, to allow asynchronous operations to be used as follows: co_await socket.async_connect(my_endpoint).
- Added missing async_initiate to the Windows-specific I/O objects' asynchronous operations.
- Ensured that the executor type is propagated to newly accepted sockets.
- Changed to require that Protocol copy and move operations never throw.
- Changed to require that Endpoint default constructor and move operations never throw.
- Added the noexcept qualifier to protocol accessors.
- Added the noexcept qualifier to socket move constructors.
- Fixed issues associated with opening serial ports on Windows:
  - Use the correct constant to initialise the RTS control flag.
  - Specify a default baud rate (9600).
- Fixed a lost "outstanding work count" that can occur when an asynchronous accept operation is automatically restarted.
- Consult the Revision History for further details.
Atomic:
- Added a workaround for __float128 not being considered as a floating point type by some versions of libstdc++.
- Improved compatibility with clang-win compiler.
Beast:
- This is a maintenance update containing bug fixes, and updates to use the new features delivered in Boost.Asio.
- We'd love to know how you or your company use Beast, consider adding an entry to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Circular Buffer:
- Fix issue #29: max_size() now takes the allocator's max_size() into account. (Glen Fernandes)
Context:
- architecture s390x supported
- execution_context removed
Endian:
- Made endian_reverse, conditional_reverse and *_to_* constexpr on GCC and Clang
- Added convenience load and store functions
- Added floating point convenience typedefs
- Added a non-const overload of data(); changed its return type to unsigned char*
- Added __int128 support to endian_reverse when available
- Added a convenience header boost/endian.hpp
Filesystem:
- Extracted filesystem_error to exception.hpp; file_status and associated enums and functions to file_status.hpp; directory_entry, directory_iterator and recursive_directory_iterator to directory.hpp.
- Deprecated: For backward compatibility operations.hpp still includes the new headers exception.hpp, file_status.hpp and directory.hpp, unless BOOST_FILESYSTEM_NO_DEPRECATED macro is defined. These implicit includes are considered deprecated and will be removed in a future release. Users are encouraged to include the new headers directly or include filesystem.hpp.
- The filesystem_error exception is now implemented in the compiled library of Boost.Filesystem. Users may need to add linking with Boost.Filesystem library in their projects.
- On POSIX.1-2008 platforms, use utimensat instead of utime. utime is declared obsolete in POSIX.1-2008 and can be disabled e.g. in uClibc-ng. (PR#115)
- directory_iterator is now left in the end state on memory allocation errors.
- In directory_iterator on POSIX systems, support for readdir/readdir_r has been reworked to avoid memory allocations for dirent structures when readdir is used. This reduces memory consumption and eliminates the possibility of buffer overruns in case if readdir produces a very long directory name.
- On Windows, use Boost.WinAPI to select the target Windows version.
- New: Added directory_options enum, which reflects the same named enum from C++20. The enum is supported in directory_iterator and recursive_directory_iterator to customize iteration behavior. In particular, the iterators now support skipping directories that can't be opened due to insufficient permissions. The symlink_option enum is now deprecated and should be replaced with directory_options.
- By default, recursive_directory_iterator is now reset to the end state in case of errors, as required by C++20. (#112)
- New: Added directory_options::pop_on_error option, which configures recursive_directory_iterator so that it attempts to recover from iteration errors by repeatedly invoking pop() until it succeeds or the end state is reached. (#113)
- New: Added directory_options::skip_dangling_symlinks option, which configures recursive_directory_iterator so that it doesn't follow dangling directory symlinks and continues iteration instead of reporting an error.
- Deprecated: The following members of recursive_directory_iterator are now marked as deprecated: level(), no_push_pending(), no_push_request(), no_push(). Users are advised to replace their use with the standard counterparts: depth(), recursion_pending(), disable_recursion_pending(). Note that recursion_pending() has the opposite meaning compared to no_push_pending() and no_push_request(). Deprecated methods will be removed in a future release.
- Fixed path::lexically_relative (and any dependent algorithms) to correctly handle empty, dot and dot-dot path elements in its argument. The behavior is made closer to C++17 std::path::lexically_relative in that empty and dot path elements are ignored and dot-dot path elements are accounted by decreasing the number of dot-dot path elements to generate in the resulting relative path. (#76)
Functional/Factory:
- Glen Fernandes rewrote the implementations of factory and value_factory to provide the following features:
  - Support r-value arguments when possible
  - Support arbitrary number of arguments via variadic templates when possible
  - Support allocators that are final
  - Support allocators that use fancy pointers
  - Support for disabled exceptions (BOOST_NO_EXCEPTIONS)
  - Improved compilation times
- The following features have been removed:
  - Increasing limits for C++03 compilers through BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
  - Using boost::none_t in place of void through BOOST_FUNCTIONAL_FACTORY_SUPPORT_NONE_T
GIL:
- Added
 - GSoC 2019: Lanczos resampling for image down scaling (PR#309).
 - GSoC 2019: Methods for binary thresholding, inverted binary thresholding and truncation thresholding (PR#313).
 - GSoC 2019: Otsu thresholding method (PR#314).
 - GSoC 2019: Adaptive thresholding using mean or gaussian-weighted sum of the neighbourhood area (PR#315).
 - GSoC 2019: Harris response calculation (corner detector without non-maximum filtering) (PR#350).
 - GSoC 2019: Hessian corner detector (PR#364).
 - GSoC 2019: Types for defining 2D kernel, kernel_2d and kernel_2d_fixed, in Numeric extension (PR#361).
 - GSoC 2019: Implementation of 2D convolution as new function convolve_2d (PR#367).
 - GSoC 2019: Box filtering using the average filter (PR#383).
 - GSoC 2019: Blur function based on normalized mean filter (PR#383).
 - GSoC 2019: Sobel and Scharr operators (PR#392).
 - GSoC 2019: Median filter to remove noise from image (PR#393).
 - Continued adding new test cases and significantly improved overall test coverage.
 - Documented purpose of cached_location_t (PR#287).
 - Function convolve_1d in Numeric extension for convenient use of convolve_rows and convolve_cols (PR#347) and PR#367).
 - Function extend_boundary in Numeric extension to perform image boundary extension (PR#386).
 - Project release notes maintained in Markdown file RELEASES.md (PR#404).
- Changed
 - Move all tests, core features and extensions, inside test/ directory (PR#302).
- Removed
 - Replace Boost.MPL with Boost.MP11 (PR#274).
 - Removed use of Boost.TypeTraits (PR#274).
 - Dropped support for GCC <= 4.8 (PR#296).
 - Remove include/boost/gil/version.hpp file as unused (PR#403).
- Fixed
 - Undetermined value of default-initialized channel and pixel objects (PR#273).
 - Undefined behaviour due to std::is_trivially_default_constructible specializations (PR#284).
 - Crash when reading PNG files with an invalid header (PR#385).
 - Applied the Rule of Three for numerous types.
 - Removed uses of deprecated implicit definition of defaulted copy assignment operator or copy constructor.
Histogram:
- Several new features and performance improvements, some bug-fixes
- See the full Release Notes for a complete list of changes
Log:
- Improved compatibility with clang-win compiler.
MPI:
- Documentation clarifications.
- Fixed scatterv bug when using explicit input buffer offsets.
- Enable usage of MPI_Probe and friend with Intel MPI >= 2019.4
- Symbol visibility on Windows
Math:
- Added Hypergeometric functions 1F0, 0F1, 2F0, 1F1 and pFq.
- Added Jacobi polynomial (and derivatives) evaluation.
- Added Gegenbauer polynomial (and derivatives) evaluation.
- Added Cardinal B-Splines (and derivatives) as polynomial functions in their own right.
- Added Cardinal Trigonometric Interpolation.
- Added new statistics sub-section.
- Added One Sample Student's T Test.
- Added Anderson Darling test for normality.
- Added Ljung Box test for auto-correlation.
- Added Runs test for random sequences.
- The headers boost/math/tools/univariate_statistics.hpp and boost/math/tools/bivariate_statistics.hpp, have been deprecated in favor of boost/math/statistics/univariate_statistics.hpp and boost/math/statistics/bivariate_statistics.hpp.
- Added The Empirical CDF distribution.
- Reworked the Sterling approximation used by multiprecision gamma functions to be applicable to all the function that use the Lanczos approximation at regular precision. Also extended Lanczos approximations up to 100 decimal digit precision.
Multiprecision:
- Big constexpr update allows cpp_int and float128 arithmetic to be fully constexpr with gcc and clang 9 or later, or any compiler supporting std::is_constant_evaluated().
- Fix bug in variable precision mpf_float which causes it to go into a tailspin trying to select the correct precision - see https://github.com/boostorg/multiprecision/issues/164.
Outcome:
- Enhancements:
 - Standalone outcome is now make install-able, and cmake find_package() can find it. Note that you must separately install and find_package() Outcome's dependency, quickcpplib, else find_package() of Outcome will fail.
 - The git submodule mechanism used by standalone Outcome of specifying dependent libraries has been replaced with a cmake superbuild of dependencies mechanism instead. Upon cmake configure, an internal copy of quickcpplib will be git cloned, built and installed into the build directory from where an internal find_package() uses it. This breaks the use of the unconfigured Outcome repo as an implementation of Outcome, one must now do one of: 1. Add Outcome as subdirectory to cmake build. 2. Use cmake superbuild (i.e. ExternalProject_Add()) to build and install Outcome into a local installation. 3. Use one of the single header editions.
 - For standalone Outcome, the current compiler is now checked for whether it will compile code containing C++ Concepts, and if it does, all cmake consumers of Outcome will enable C++ Concepts. Set the cmake variable CXX_CONCEPTS_FLAGS to an empty string to prevent auto detection and enabling of C++ Concepts support occurring.
 - OUTCOME_TRY operation now hints to the compiler that operation will be successful. P1886 Error speed benchmarking showed that there is considerable gain in very small functions by hinting to the compiler whether the expression is expected to be successful or not. OUTCOME_TRY previously did not hint to the compiler at all, but now it does. A new suite of macros OUTCOME_TRY_FAILURE_LIKELY hint to the compiler that failure is expected. If you wish to return to the previously unhinted behaviour, define OUTCOME_TRY_LIKELY(expr) to (!!expr).
 - #199 Support for C++ Coroutines has been added. This comes in two parts, firstly there is now an OUTCOME_CO_TRY() operation suitable for performing the TRY operation from within a C++ Coroutine. Secondly, in the header outcome/coroutine_support.hpp there are implementations of eager<OutcomeType> and lazy<OutcomeType> which let you more naturally and efficiently use basic_result or basic_outcome from within C++ Coroutines -- specifically, if the result or outcome will construct from an exception pointer, exceptions thrown in the coroutine return an errored or excepted result with the thrown exception instead of throwing the exception through the coroutine machinery (which in current compilers, has a high likelihood of blowing up the program). Both eager<T> and lazy<T> can accept any T as well. Both have been tested and found working on VS2019 and clang 9.
 - #210 make_error_code() and make_exception_ptr() are now additionally considered for compatible copy and move conversions for basic_result<>. This lets you construct a basic_result<T, E> into a basic_result<T, error_code>, where E is a custom type which has implemented the ADL discovered free function error_code make_error_code(E), but is otherwise unrelated to error_code. The same availability applies for exception_ptr with make_exception_ptr() being the ADL discovered free function. basic_outcome<> has less support for this than basic_result<> in order to keep constructor count down, but it will accept via this mechanism conversions from basic_result<> and failure_type<>.
- Bug fixes:
 - #184 The detection of [[nodiscard]] support in the compiler was very mildly broken.
PolyCollection:
- Maintenance work.
Preprocessor:
- Topic added which discusses emptiness
- Support for the C++20 __VA_OPT__ construct
  - BOOST_PP_VARIADIC_HAS_OPT whether __VA_OPT__ is supported at the C++20 level
  - BOOST_PP_CHECK_EMPTY test for emptiness using __VA_OPT__ at the C++20 level
  - BOOST_PP_VA_OPT more flexible alternative to __VA_OPT__ at the C++20 level
Smart Pointers:
- Implemented allocate_unique for scalars and arrays. (Glen Fernandes)
Test:
- Boost.test v3.12 see the Changes log for more details.
- New feature:
  - Support for C++17 std::string_view has been added.
  - Better diagnostic on boost::exception and no rtti mode (thanks to Mikhail Pilin / [pull_request 234])
- Bug fixes and pull requests:
  - GitHub Issues: #206, #217, #223, #229
  - GitHub Pull Requests: PR#227, PR#231, PR#232, PR#234
VMD:
- BOOST_VMD_IS_EMPTY updated to use __VA_OPT__ at the C++20 level has 100% reliability

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow and Michael Caisse managed this release.

Version 1.71.0

Mon, 19 Aug 2019 15:31:22 +0000

New Libraries

Variant2: A never-valueless, strong guarantee implementation of std::variant, from Peter Dimov.

Updated Libraries

Align:
- Support for any integral type in the integral versions of align_up and align_down.
- Revised the implementation of aligned_allocator to no longer require a specialization for void.
- Define propagate_on_container_move_assignment and is_always_equal in aligned_allocator.
Asio:
- Improved performance slightly by eliminating a redundant move construction when completed handlers are dispatched.
- Eliminated a compiler warning by annotating a case fall-through in the free function connect() implementation.
- Fixed the is_*_buffer_sequence detection traits for user-defined sequence types.
- Fixed some Windows-specific warnings about an incompatible pointer cast when obtaining the CancelIoEx entry point.
- Changed to automatically set the defaults when opening a serial port on Windows.
- Changed the serial port get_option() member function to be const.
- Fixed a name hiding issue with the WinRT stream-oriented socket backend's shutdown function.
- Applied a minor fix to the documentation for is_dynamic_buffer.
- Added some support for Haiku OS.
- Added wolfSSL compatability.
- Changed to require C++17 or later for coroutines TS support with clang.
- Fixed a doxygen generation problem in the tutorial.
- Ensured example programs are correctly incorporated into the documentation.
Any:
- Static initialization of the default constructed boost::any is now possible.
- Fixed performance regression in assignment on a compilers without move-semantics.
- Maintenance work.
Beast:
- This version consists mostly of bug fixes and performance improvements.
- Substantial work included for the split compilation mode, to reduce compile time when defining BOOST_BEAST_SEPARATE_COMPILATION.
- We'd love to know how you or your company use Beast, consider adding an item to the Companies and Individuals Using Beast list.
- See the full Release Notes for a complete list of changes.
Circular Buffer:
- Correct doxygen generated reference to no longer show internal members. (Glen Fernandes)
- Eliminate ubsan warning on add and sub. (Glen Fernandes)
- Fix incorrect check in is_uninitialized. (Niklas Fejes)
Container:
- Fixed bugs:
- deque can now have options, using deque_options. The block size/bytes can be be specified.
- static_vector can now have options, using static_vector_options. Alignment and throwing behaviour can be be specified.
- small_vector can now have options, using small_vector_options. Alignment and growth factor can be be specified.
Context:
- Add support for RISC-V LP64D
- #72: Fix ABI violation on ppc64 ELFv2
- #99: cleanup of stack if creating ucontext fails
Conversion:
- Maintenance work.
Core:
- Added functions alloc_construct, alloc_construct_n, alloc_destroy, and alloc_destroy_n in <boost/core/alloc_construct.hpp> for allocator aware and exception safe construction and destruction of objects and arrays. (Glen Fernandes)
- Added constexpr functions first_scalar in <boost/core/first_scalar.hpp> for obtaining a pointer to the first scalar element of an array. Given a pointer of type T* they return a pointer of type remove_all_extents_t<T>*. (Glen Fernandes)
- Added class template noinit_adaptor in <boost/core/noinit_adaptor.hpp> which is an allocator adaptor that converts any allocator into one whose construct(ptr) performs default initialization via placement new, and whose destroy(ptr) invokes the value_type destructor directly. (Glen Fernandes)
- Added class template default_allocator in <boost/core/default_allocator.hpp>, which can serve as a minimal default allocator that has interface similar to C++20 std::allocator, supports configurations with disabled exceptions and does not have std as an associated namespace. The allocator uses operator new and operator delete for allocation. (Glen Fernandes)
- In <boost/core/uncaught_exceptions.hpp> header, added workarounds for better compatibility with QNX SDP 7.0 when libc++/libc++abi libraries are used. (Andrey Semashev, #59)
- The <boost/detail/sp_typeinfo.hpp> header is now marked as deprecated and will be removed in a future release. <boost/core/typeinfo.hpp> should be used instead. (Peter Dimov)
Dynamic Bitset:
- Enabled hardware-assisted popcount on MSVC (PR#38).
- Added support for boost::hash and std::hash (PR#45).
- Support copy-initialization with default constructor (PR#48).
Endian:
- Clarified requirements on the value type template parameter
- Added support for float and double
- Added endian_load, endian_store
- Updated endian_reverse to correctly support all non-bool integral types
- Moved deprecated names to the deprecated header endian.hpp
Fiber:
- documentation for shared_work updated
Filesystem:
- Fixed incorrect error_code returned from directory iterator increment when readdir_r is used.
- For path, fixed rvalue-aware operator/ return type to return an rvalue instead of rvalue reference. This fixes leaving a dangling reference in the user's code if the result of operator/ is bound to a const reference. (#110)
- Fixes for better compatibility with Windows CE. (PR#24)
- Added minimal support for CMake. (PR#106)
Flyweight:
- Maintenance work.
Histogram:
- New features:
  - Support for thread-safe storages and new thread-safe accumulators
  - Support for compiling without exceptions/RTTI (increases performance by 10-20 %) (with Glen Fernandes)
  - Performance improvements for 1D and 2D histograms
  - boost::histogram::indexed now returns forward iterator range instead of input iterator range
  - boost::histogram::indexed_range::accessor is now non-copyable and acts like reference to cell value, making more algorithms from the C++ stdlib work
  - boost::histogram::algorithm::reduce with new slice option and option fusion
  - boost::histogram::algorithm::project accepts runtime indices for static histograms
- Bug Fixes:
  - boost::histogram::algorithm::reduce also works on histograms that have some axis types without reduction support
  - boost::histogram::axis::traits::update now works correctly for boost::histogram::axis::variant
- Other:
  - 100 % test coverage
  - Reduced internal Boost dependencies
  - Improved documentation and examples
  - Guaranteed no-throw moves for all builtin axis types
  - Compile cleanly at higher warning levels
- See changelog for more details.
IoStreams:
- Fixed processing of multi-stream files (PR#87).
- Added support for multi-threaded LZMA (PR#95).
Interprocess:
- GitHub #85 ("warning: Implicit conversion loses integer precision").
- GitHub #86 ("warning: Possible misuse of comma operator").
Intrusive:
LexicalCast:
- Added tests for boost::filesystem::path conversions #25.
- Maintenance work, including #28.
Log:
- New features:
 - Improved support for C++17 std::string_view in basic_formatting_ostream. The string view can now participate in character code conversion on output.
 - Added auto_newline formatter and stream manipulator. It can be used to ensure that formatted output always ends with a newline while avoiding duplicate newlines.
 - In the output stream, text file and text multi-file sink backends added support for configuring behavior with regard to appending a trailing newline to every formatted log record. Use auto_newline_mode named parameter of the backend constructor or call the set_auto_newline_mode method on the sink backend.
 - Note: The default behavior with regard to trailing newlines added by sink backends has changed slightly compared to the previous Boost.Log releases. The backends will now only add a trailing newline if there isn't one in the formatted log message string already. In previous releases a newline was added unconditionally.
 - Added support for passing arbitrary function objects in the filter and format named parameters to sink constructors and convenience functions for initializing sinks. For example, it is now possible to specify C++11 lambda functions directly in these parameters. (#63)
 - In the default filter and formatter factories used in filter and formatter parsers, added support for severity level attribute values of type boost::log::trivial::severity_level. For filters, the support is limited to attributes with "Severity" name.
- Bug fixes:
 - Fixed incorrect parsing of components of the rotated file names while scanning for files in the text file sink backend. If the file name pattern ended with a placeholder (for example, a file counter), the scan_for_files method would not find files matching that pattern in the target storage, leaving them unmanaged. In particular, such files would not be deleted to free target storage. (#78)
 - Updated basic_formatting_ostream and basic_record_ostream to make it possible to overload stream output operators for pointers to user-defined types. User-defined operator<< overloads taking std::basic_ostream and a pointer argument should now be picked up by the compiler when the pointer is being written to one of Boost.Log streams. (#84)
- See changelog for more details.
Math:
- New features:
  - Catmull-Rom interpolator now works in C++11
  - Cardinal quadratic B-spline interpolation
  - Domain of elliptic integrals extended
  - sin_pi and cos_pi performance improvements
  - Forward-mode automatic differentiation
  - Vector valued barycentric rational interpolation
  - Ooura's method for evaluation of Fourier integrals
- Bug fixes:
  - Multiple compatibility issues with Multiprecision fixed
  - Lambert-W fixed on a rare architecture
Metaparse:
- New features:
 - In C++11 variadic template support for the following: sequence, one_of_c, one_of, repeated_one_of, repeated_one_of1, one_char_except_c, one_char_except.
- Bug fixes:
 - BOOST_METAPARSE_STRING does not use out of range character values as template arguments.
 - any_of_c<> does not create empty array in C++14.
Move:
- Git Issue #26: "Invalid iterator increment/decrement in the last iteration of adaptive_sort_combine_blocks".
Multi Array:
- Simplify allocator support by using new alloc_construct_n and alloc_destroy_n facilities from Core. (Glen Fernandes)
Multi-index Containers:
- Added variants of const_mem_fun and mem_fun for differently qualified member functions (issue #24).
- Terse key specification syntax now correctly handles noexcept-specified member functions (issue #24).
Outcome:
- Enhancements:
 - #184 As per request from Boost release managers, relocated version.hpp and revision.hpp into detail, and added the Boost licence boilerplate to the top of every source file which was missing one (I think). Also took the opportunity to run the licence restamping script over all Outcome, so copyright dates are now up to date.
 - #185 Add FAQ item explaining issue #185, and why we will do nothing to fix it right now.
 - #189 Refactored the OUTCOME_TRY implementation to use more clarified customisation points capable of accepting very foreign inputs. Removed the std::experimental::expected<T, E> specialisations, as those are no longer necessary. Fixed the documentation for the customisation points which previously claimed that they are ADL discovered, which they are not. Added a recipe describing how to add in support for foreign input types.
 - #183 Added a separate motivation/plug_error_code specifically for Boost.
- Bug fixes:
 - OUTCOME_VERSION_MINOR hadn't been updated to 1.
 - #181 Fix issue #181 where Outcome didn't actually implement the strong swap guarantee, despite being documented as doing so.
 - #190 Fix issue #190 in Boost edition where unit test suite was not runnable from the Boost release distro.
 - #182 Fix issue #182 where trait::is_exception_ptr_available<T> was always true, thus causing much weirdness, like not printing diagnostics and trying to feed everything to make_exception_ptr().
 - #192 Fix issue #192 where the std::basic_outcome_failure_exception_from_error() was being defined twice for translation units which combine standalone and Boost Outcome's.
Parameter:
- Upgraded keyword generation macro BOOST_PARAMETER_TEMPLATE_KEYWORD (PR#15).
- Moved keyword generation macro BOOST_PARAMETER_NESTED_KEYWORD from Accumulators to this library (PR#28).
- Added support for std::reference_wrapper and std::ref() (PR#16).
- Moved boost::parameter::required, boost::parameter::optional, and boost::parameter::deduced metafunction definitions to their own header files in directory boost/parameter (PR#18).
- Added support for Boost.Parameter-enabled function call operators (PR#20).
- Added support for parameter category qualifiers "forward", "consume", and "move_from" (current qualifiers are "in", "out", and "in_out") (PR#21) (PR#23) based on http://www.modernescpp.com/index.php/c-core-guidelines-how-to-pass-function-parameters. Added new usage syntax BOOST_PARAMETER_NAME((object-name), namespace-name) qualifier(tag-name)) and BOOST_PARAMETER_NAME(qualifier(name)). (Existing code that uses qualifiers directly and correctly with BOOST_PARAMETER_FUNCTION and other code generation macros should remain unaffected for now, so no breaking changes.) The reason for the change in usage is to enable applying of parameter category constraints to Boost.Parameter-enabled functions and constructors invoked through argument composition. (Otherwise, it is currently possible to use argument composition to bypass parameter category constraints applied in BOOST_PARAMETER_FUNCTION et. al.)
- Added support for perfect forwarding (PR#23) (PR#26), so that parameter::parameters::operator() can accept non-const rvalues. As a positive side effect, Boost.Parameter-enabled functions and constructors are no longer bound by BOOST_PARAMETER_MAX_ARITY on compilers that support perfect forwarding. User code can now check for this support by detecting the configuration macro BOOST_PARAMETER_HAS_PERFECT_FORWARDING, or manually turn off this support by defining the configuration macro BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING.
- Added metafunctions boost::parameter::is_argument_pack (PR#27), boost::parameter::are_tagged_arguments (PR#52), and boost::parameter::result_of::compose (PR#75).
- Added variadic function template boost::parameter::compose() which takes in named arguments and returns them in an argument pack (PR#52). For compilers that do not support perfect forwarding, the configuration macro BOOST_PARAMETER_COMPOSE_MAX_ARITY determines the maximum number of arguments that boost::parameter::compose() can take in (PR#61).
- Added code generation macros BOOST_PARAMETER_BASIC_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_BASIC_CONST_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_FUNCTION, BOOST_PARAMETER_NO_SPEC_MEMBER_FUNCTION, BOOST_PARAMETER_NO_SPEC_CONST_MEMBER_FUNCTION, BOOST_PARAMETER_NO_SPEC_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_CONST_FUNCTION_CALL_OPERATOR, BOOST_PARAMETER_NO_SPEC_CONSTRUCTOR, and BOOST_PARAMETER_NO_SPEC_NO_BASE_CONSTRUCTOR (PR#52).
- Added support for Boost.MP11 (PR#47) (PR#66) (PR#70). User code can now check for this support by detecting the configuration macro BOOST_PARAMETER_CAN_USE_MP11, or manually turn off this support by defining the configuration macro BOOST_PARAMETER_DISABLE_MP11_USAGE.
- Improved support for parameter-dependent return types via SFINAE (PR#73).
PtrContainer:
- Fix a ptr_vector regression introduced in 1.66.0 (PR#24).
PolyCollection:
- Maintenance work.
SmartPtr:
- Added aliasing constructors to weak_ptr
- Added weak_ptr<T>::empty()
- Added enable_shared_from, shared_from, and weak_from
Stacktrace:
- Fixed output of name(), source_location() and source_line() for the default constructed frame with thread sanitizer builds in C++98 mode.
- Fixed output of long strings from name() and source_location() on MSVC #78.
- Maintenance work.
Test:
- Boost.test v3.11 see the Changes log for more details.
- Breaking changes:
  - Boost.Test shows deprecation warnings if some very old headers as deprecated. If you encounter such warnings, please follow the indications: those headers will be removed in a future release.
- New feature:
  - Now BOOST_TEST can be used to compare abstract types
- Bug fixes and pull requests:
  - GitHub Issues: #209, #218
  - GitHub Pull Requests: PR#219, PR#224
Utility:
- Implemented function template ostream_string in <boost/utility/ostream_string.hpp> to optimally write any kind of string content to an output stream. It satisfies the requirements of [ostream.formatted.reqmts]. (Glen Fernandes)
- Optimized the stream output operators of basic_string_view and basic_string_ref to write directly to the rdbuf stream buffer. (Glen Fernandes)
Uuid:
- Breaking change: MD5 name-based uuid generation was corrected to be identical on all endian systems. Define BOOST_UUID_COMPAT_PRE_1_71_MD5 to keep the result in a format compatible with 1.66 through 1.70. This does not affect the default name-based uuid generation which is based on SHA1. (PR#109)
Variant:
- Fixed compilation of boost::apply_visitor with variants passed by non const reference in PR#68. Many thanks to Ed Catmur for providing the fix.
- Added support for std::hash (PR#49). Macro BOOST_VARIANT_DO_NOT_SPECIALIZE_STD_HASH could be defined to avoid those specializations.
- Added micro optimizations for binary size and performance by Nikita Kniazev in PR#63 and PR#66.
- Maintenance work, including PR#64 by Nikita Kniazev and PR#67 by Hans Dembinski.
YAP:
- Added an example showing how to make self-evaluating YAP expressions (that is, expressions that don't need an explicit call to evaluate() or transform()).

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Marshall Clow and Michael Caisse managed this release.

Version 1.70.0

Fri, 12 Apr 2019 06:04:48 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release. Be careful as they have not been through the normal testing process.

Fix moved-from executor in idle ping timeout (#1599)
- Beast patch

New Libraries

Outcome: A set of tools for reporting and handling function failures in contexts where directly using C++ exception handling is unsuitable, from Niall Douglas.
Histogram: Fast and extensible multi-dimensional histograms with convenient interface for C++14, from Hans Dembinski.

Updated Libraries

Asio:
- This release includes a number of new features, bug fixes, performance enhancements, and documentation improvements. Notable changes include:
  - Added the ability to use custom I/O executors with I/O objects (such as sockets).
  - Added a new async_result form with an initiate static member function.
  - Updated the Coroutines TS support and promoted it to the asio namespace.
  - Added a new DynamicBuffer_v2 concept which is CopyConstructible.
  - Added a new async_compose function that simplifies the implementation of user-defined asynchronous operations.
  - Added a make_strand helper function.
  - Relaxed the completion condition type requirements to only require move-constructibility rather than copy-constructibility.
  - Added a constructor for local::basic_endpoint that takes a string_view.
  - Added the noexcept qualifier to various functions.
  - Added a new BOOST_ASIO_DISABLE_VISIBILITY configuration #define.
  - Enabled recycling of the memory used to type-erase a function object with the polymorphic executor.
  - Changed receive operations to return the correct number of bytes transferred when truncation (error::message_size) occurs on a datagram-oriented socket.
  - Fixed calculation of absolute timeout when the backend uses pthread_cond_timedwait.
  - Changed the range-based asynchronous connect operation to deduce the EndpointSequence iterator type.
  - Fixed buffer_sequence_begin and buffer_sequence_end to prevent implicit conversion.
  - Ensured SSL handshake errors are propagated to the peer before the local operation completes.
  - Suppressed the eof error on SSL shutdown as it actually indicates success.
  - Added a fallback error code for when we OpenSSL produces an SSL_ERROR_SYSCALL result without an associated error.
  - Changed composed asynchronous read and write operations to move buffer sequence objects.
  - Fixed a macOS-specific warning about the deprecation of OSMemoryBarrier.
  - Fixed compile errors that occur when using the composed read and write operations with MSVC 11.0.
  - Improved dispatch, post and defer documentation.
  - Fixed a Windows-specific memory leak that may occur when system_executor is used.
- Consult the Revision History for further details.
Beast: BIG Update!!!
- Some APIs have changed.
- The reference shows a star ★ next to each new item.
- Beast needs your help!
 - Tell Us how you or your company use Beast
 - Please report any bugs, feature requests, or general feedback
 - Join the C++ Slack Workspace for free and chat with us in the #beast and #boost channels
 - Don't forget to star the repository ⭐!
- More tutorials, code like the pros!
 - Networking Refresher teaches you from the ground up.
 - Updated Asynchronous Echo example
 - Updated Detect SSL composed operation tutorial
 - websocket-chat-multi threaded chat server with a JavaScript browser client
- basic_stream and tcp_stream offer:
 - Timeouts: async_read_some, async_write_some complete with error::timeout on expiration!
 - Traffic-shaping policies simple and unlimited, or a user-defined RatePolicy!
 - Put the strand directly on the socket using P1322R0, no more bind_executor at call sites!
- Base classes async_base and stable_async_base and handle all composed operation boilerplate for you.
- ssl_stream provides a movable, assignable SSL stream with a flat write optimization.
- All asynchronous operations use Asio's async_initiate for efficient integration with Coroutines TS.
- ⚡ faster compilation, define BOOST_BEAST_SEPARATE_COMPILATION and #include <boost/beast/src.hpp> in one of your .cpp files!
- See the full Release Notes for a complete list of changes.
Context:
- #91: cleanup of stack if creating ucontext fails
- #97: add missing BOST_CONTEXT_DECL in stack_context
- #98: fix jump_i386_sysv_macho writing garbage to the x87 control word
Coroutine2:
- #28: don't crash on pthread_cancel
DLL:
- New macro BOOST_DLL_USE_STD_FS. Define it to 1 to make the Boost.DLL use C++17's std::filesystem::path, std::system_error and std::error_code (#21). Note that exception types change from boost::system::system_error to std::system_error, so make sure to update catches.
- Significant rewrite of the dynamic loadable detection and decoration logic. More precise errors are now reported in case of loading failures. Added shared_library::decorate() function that returns a decorated path to the library without doing any platform related queries and detections. Prefer using shared_library::load and shared_library constructors for better results (many thanks to Loïc Touraine for the work PR#23).
- CI hardening, docs updates, typos fixes, cleanups and many portability fixes.
Dynamic Bitset:
- Disabled hardware-assisted popcount (added in 1.69.0) on MSVC due to undefined behavior on older CPUs. (#33 PR#35)
Fiber:
- #191: ignore unused argument warning
- #196: fix high contention on remote_ready_splk_
Filesystem:
- Fixed a few instances of dereferencing std::string::end() in path implementation.
- Fixed program termination in case of out of memory condition in directory iterators constructors and operations accepting a reference to error_code. (#58)
- Fixed possible linking errors caused by missing definitions of static members of path. (#12759)
- Fixed possible use of uninitialized data in directory iterator increment operation on Linux.
- Added support for movability to directory iterators.
- Added file status query overloads for directory_entry. This avoids a relatively expensive OS query when file status is requested for a result of dereferencing a directory iterator. (PR#55)
- Reworked current_path and read_symlink implementation to avoid possible memory exhaustion on broken or tampered with filesystems. The functions now have an internal limit of the path size they will accept from the OS, which is currently 16 MiB.
- Increased the size of the internal buffer used by copy_file.
Integer:
- Added Extended Euclidean Algorithm and Modular Multiplicative Inverse function. (Nick Thompson, PR#11)
Log:
- New features:
  - Added support for generating another log file name before collecting the file in the text file sink backend. This allows to combine appending to an existing log file with timestamps and file counters in log filenames, and, consequently, file collection in general.
- See changelog for more details.
Math:
- New features:
  - Add Lanczos smoothing derivatives
  - Move numerical_differentiation.hpp from boost/math/tools/ to boost/math/differentiation/finite_difference.hpp.
  - Add mean, variance, skewness, kurtosis, median, Gini coefficient, and median absolute deviation to tools/univariate_statistics.hpp.
  - Add correlation coefficients and covariance to tools/bivariate_statistics.hpp
  - Add absolute Gini coefficient, Hoyer sparsity, oracle SNR, and the M[sub 2]M[sub 4] SNR estimator to tools/signal_statistics.hpp.
  - Add total variation, l0, l1, l2, and sup norms, as well as corresponding distance functions to tools/norms.hpp.
  - Add move constructors for polynomials, support complex coefficients, add .prime() and .integrate() methods.
  - Add quadratic_roots to tools/roots.hpp.
  - Add support for complex-valued functions to Newton's method in roots.hpp.
  - Add Catmull-Rom interpolator.
Mp11:
- Renamed mp_invoke to mp_invoke_q
- Added mp_similar
- Added mp_set_union, mp_set_intersection, mp_set_difference
- Added mp_not_fn
- Added mp_transform_first, mp_transform_second, mp_transform_third
- Added mp_filter
- Added mp_eval_if_not, mp_eval_or, mp_valid_q
- Added mp_back, mp_pop_back
Multi-index Containers:
- size_type and difference_type are now defined as the allocator's same-named types. This will not make any difference in the vast majority of cases, but allows for some degree of control of resulting internal structures via user-defined allocator types (see issue #17 for motivation). For the moment being, this change is not documented in the reference section (i.e., it has semi-official status).
- Maintenance work.
Multiprecision:
- Fix various conversion issues in the traits classes, check for compatibility with Boost.Optional.
- Prevent instantiation of std::numeric_limits on any old type when checking for convertibility. See #98.
- Update variable precision code to account for arbitrary precision integers. See #103.
- Add support for XML serialization archives.
- Fix bug in fixed precision iostream formatting in mpf_float and mpfr_float. See #113.
- Add more overloads for special functions which are better handled natively by MPFR.
- Fixed bug in generic exp implementation which could cause invariant failure.
- Fixed generic conversion from float to integer to avoid undefined behaviour. See #110.
PolyCollection:
- Improved handling of stateful allocators and allocator propagation traits, after an error reported by Billy O'Neal (PR#9).
- Fixed a potentially serious bug with an internal cache structure.
Spirit:
- Removed use of deprecated boost/detail/iterator.hpp header. PR#432
- X3
 - Integer parsers should now handle user defined types. PR#429
 - Note: The check_overflow trait default implementation now relies on std::numeric_limits<T>::is_bounded instead of boost::integer_traits<T>::is_integral.
 - Removed sequence into plain parsing. Now it triggers a compile time error instead of silently parsing the the sequence and taking the last value as a result. PR#439
 - Fixed parse_rule instantiation with BOOST_SPIRIT_INSTANTIATE when:
 
 A rule has no attribute. PR#455
 
 An actual attribute is not of type a rule was declared with. PR#456 #457
 - A huge thanks goes out to Xeverous for reporting a regression in #453.
 - Fixed unneded attribute synthesization and no-transformation attribute reference pass-through in rules. #444 PR#449 PR#452
 - Removed broken 1.0#INF parser. It was poorly documented and never worked. #415 PR#458 #8699
 - The undocumented make_attribute trait was removed due to bugs PR#449 and to simplify attribute transformation. PR#460
 - If you were using it to workaround bugs in attribute transformation - they should not be needed anymore as of this release.
 - The integer value parser now respects std::numeric_limits<T>::digits10 value. PR#469
 - Fixed underflow check for a (Min % Base) == 0 corner case. PR#469
 - Fixed an output value on overflow of IgnoreOverflowDigits=true integer parser. PR#470
 - Container attribute elements were copyied, but not moved. PR#472
 - Special handling of references in transform_attribute was removed. PR#480
- V2
 - Macro name collisions and namespace conflicts with Boost.Endian were fixed. PR#349 PR#482
 - utree
 
 Fixed UB in tag getter due to left shift of negative value. PR#423
 
 Fixed double-conversion (spirit::string -> std::string -> spirit::string). PR#462
 - Qi
 
 Added static asserts for rule skipper type problems. PR#427
 
 The check_overflow trait default implementation now relies on std::numeric_limits<T>::is_bounded instead of boost::integer_traits<T>::is_integral PR#429
 
 Integer parsers should now handle user defined types. PR#429
 
 Note: The check_overflow trait default implementation now relies on std::numeric_limits<T>::is_bounded instead of boost::integer_traits<T>::is_integral.
 
 Removed broken 1.0#INF parser. It was poorly documented and never worked. #415 PR#458 #8699
 
 The undocumented make_attribute trait was merged into transform_attribute trait. PR#471
 
 The pre_transform, post_transform, and fail_transform utility functions were removed in favor of directly using pre/post/fail of the transform trait. PR#467
 
 The integer value parser now respects std::numeric_limits<T>::digits10 value. PR#469
 
 Fixed underflow check for a (Min % Base) == 0 corner case. PR#469
 
 Fixed an output value on overflow of IgnoreOverflowDigits=true integer parser. PR#470
 
 Special handling of references in transform_attribute was removed. PR#480
 - Lex
 
 Fixed UB in default constructor of lexer with user specified token type. PR#420
- Classic:
 - Fixed position_iterator forming reference to local when the underlying iterator dereference operator returns a non-reference type. PR#422 #9737
Stacktrace:
- Build fix for iOS 32-bit ARM (many thanks to Ivan Ponomarev for providing the fix PR#70)
- Fixed multiple typos, warnings and updated the docs.
Test:
- Boost.test v3.10 see the Changes log for more details.
- Breaking changes:
  - Boost.Test minimal.hpp is now showing a deprecation warning,
  - Change in floating point comparison may fail tests that were silently not using the floating point comparison logic prior to this release,
  - Internal API change to unit_test_log_formatter, see detailed change log,
- New feature:
  - Floating point comparison has been extended to capture non-floating point and arithmetic operands: expressions like BOOST_TEST(3.0001 == 3) now use floating point support of Boost.Test,
  - Custom datasets are not required to declare the sample type field anymore,
  - Extending template test cases from std::tuple to any variadic definition,
  - Windows support for timed tests,
  - Timed test on test-suites,
  - Removed dependency to Boost.Timer,
  - New macro BOOST_TEST_INFO_SCOPE for scoped context declaration,
  - Improved BOOST_TEST_CONTEXT syntax
- Bug fixes and pull requests:
  - Trac tickets: #7397, #9434, #13106, #13418
  - GitHub Issues: #133, #138, #141, #157, #160, #174, #176, #177, #180, #181, #194, #196, #198, #199, #202, #203, #204
  - GitHub Pull Requests: PR#171, PR#172, PR#182, PR#183, PR#184, PR#190, PR#195, PR#195, PR#197, PR#205
TypeIndex:
- Support for the GHS C++ compiler added (many thanks to Brandon Castellano for providing the patch PR#28)
- Optimized string and type comparisons (many thanks to Andrey Semashev for providing the patch PR#23)
- Fixed clang-win compilation (many thanks to Peter Dimov for providing the patch PR#25)
- CI hardening.
TypeTraits:
- Added is_bounded_array and is_unbounded_array (Glen Fernandes).
- Added copy_reference and copy_cv_ref (Glen Fernandes).
- Improved support for msvc with /clr option.
- Misc compiler compatibility fixes.
Variant:
- Many cleanups and internal improvements, many thanks to Nikita Kniazev (PR#55, PR#56, PR#57) and Louis Dionne (PR#51)
- CI hardening.
uBlas:
- Addition of tensor framework (many thanks to Cem Bassoy PR#65)
- Addition of basic OpenCL support (many thanks to Fady Essam PR#59)
- Integration of basic benchmark suite (many thanks to Stefan Seefeld PR#57)
- CI integration and hardening

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0, 8.0.0
- Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Daniel James, Vladimir Prus, Marshall Clow and Michael Caisse managed this release.

Version 1.69.0

Wed, 12 Dec 2018 02:58:32 +0000

Notes for non-Windows users

The Boost build system now supports visibilities. If you are building shared libraries, they will use hidden visibility by default. As a result Boost shared libraries become smaller, load faster and have less chances to get a symbol collision.

See Boost.Build visibility and local-visibility for more info.

To disable that feature you can use use a command line ./b2 visibility=global to build.

New Libraries

Safe Numerics: A library for guaranteed correct integer arithmetic for C++14 and later, from Robert Ramey.

Updated Libraries

Any:
- Fixed issue with visibility. Now boost::any variables constructed in one shared library with hidden visibility could be used and destroyed in other shared library with hidden visibility.
- Maintenance: dropped some dependencies on other Boost libraries, fixes for docs.
Asio:
- Fixed a problem with the detection of std::future availability with libstdc++.
- Fixed compile error in regex overload of read_until.
- Fixed a timer heap corruption issue that can occur when moving a cancelled timer.
- Fixed detection of std::experimental::string_view and std::string_view with newer clang/libc++.
- Fixed MSVC version detection for availability of std::invoke_result.
- Fixed the buffer sequence traits to test the new requirements, if decltype is available.
- Fixed an MSVC issue when building with exceptions disabled.
- Added SSL context options for TLS v1.3.
- Added a compile-time test for TLS v1 support.
- Fixed the macro used to test for TLS v1.2 support.
- Prevented global objects from being created once per thread on Windows.
- Fixed a crash when using size(), max_size() or empty() on default-constructed resolver results.
- Changed to move the return value in basic_resolver_results::begin() to avoid copying.
- Enabled move support for the Intel Compiler.
- Fixed std::string_view detection issue when using clang-cl.
- Fixed the handler tracking operation name for io_context::executor_type::dispatch.
- Fixed a buffer overflow that could occur when parsing an address string with a 64-bit scope id.
- Added examples showing how to write composed operations.
- Added C++11 versions of the Timeouts, Timers, SOCKS4 and SSL examples.
- Fixed minor issues in documentation and examples.
Assign:
- Add rvalue reference, perfect forwarding, and variadic template support (PR#6) (#10477)
- Avoid conversion to container's allocator (PR#29) (#5419) (#7364)
Beast:
- This version fixes some issues in the examples, and provides a new experimental socket which supports built-in timeouts on asynchronous operations.
- New CppCon 2018 websocket chat example and presentation video.
- For a complete list of changes, please view the official Release Notes.
CircularBuffer:
- Use the empty base optimization for storing allocators that are empty and not final (Glen Fernandes).
Concept Check:
- Removed dependency on mpl. (PR#14)
Context:
- #85: duplicate alias should be missing GCC alias
- #87: the clang-win toolset (clang-cl.exe) uses masm from the underlying msvc
- #90: remove useless lines in Jamfile.v2
- #91: add .file section for *_elf_gas.S files
Core:
- Implemented boost::empty_value, for library authors to conveniently leverage the Empty Base Optimization to store objects of potentially empty types (Glen Fernandes). This facility is now used in Boost.Beast, Boost.CircularBuffer, Boost.MultiArray, and more.
- Implemented boost::quick_exit to provide the C++11 standard library facility std::quick_exit functionality (Peter Dimov).
- Reduced the number of statics in Lightweight Test, and employ lighter abort behavior for MSVC compilers upon failure to call boost::report_errors (Glen Fernandes).
DLL:
- Resolved link issues with the smart library #20.
- Maintenance: fixes for docs and tests.
Dynamic Bitset:
- Performance improvements (over 2x in some cases). (PR#26)
- Added range-based set, reset, flip methods (PR#27)
Fiber:
- #181: unbuffered_channel push not return
- #182: Remove UTF-8 BOM at begining of the file
- #183: Fix boost-install use; should only be issued once
Filesystem:
- Don't use readdir_r on Linux and Android since the readdir function is already thread-safe. (PR#68, #72)
- Fixed crashes in boost::filesystem::copy due to undefined behavior in the implementation. (PR#71)
- Fixed undefined behavior in boost::filesystem::directory_iterator implementation. (PR#77)
- Fixed compilation errors when using directory iterators with BOOST_FOREACH.
- Removed workarounds for older PGI C++ compiler versions to fix compilation on the newer ones. (PR#49)
- Fixed MSVC warnings about narrowing conversions. (PR#44)
Flyweight:
- Fixed some issues in GCC related to Boost.MPL placeholder expression handling.
- Maintenance fixes.
Function:
- Removed dependencies on mpl, test (PR#20) (PR#22)
Geometry:
- Improvements
  - PR#486 Karney's solution of direct geodesic problem for internal use (thanks to Adeel Ahmad).
  - PR#490 Discrete Frechet and Hausdorff distance algorithms (thanks to Yaghyavardhan Singh Khangarot).
  - PR#496 New run-time and upgraded compile-time SRS transformation interfaces (undocumented for now due to potential interface changes).
- Solved issues
  - #520 Missing documentation for dsv().
  - #521 Wrong documentation description for distance().
  - #524 Fixed 'enumeration values not handled in switch' warnings.
  - #527 Workaround for VS 2017 (msvc-15).
- Bugfixes
  - PR#505 Fixed overflow in overlay algorithms (thanks to Dane Springmeyer).
  - PR#518 Fixed passing of temporaries in append() (thanks to xventura81).
  - PR#522 Support python3 in building documentation.
GIL:
- Changed
 - Refactored library includes to #include <boost/gil/...> structure (PR#145).
- Removed
 - Header include/boost/gil_all.hpp file as deprecated (PR#145).
 - Header include/boost/gil_concepts.hpp file as deprecated (PR#145).
 - Header include/boost/gil_config.hpp file as unnecessary (PR#144).
- Fixed
 - Fixed point<T> divide and multiply to not to hardcode result as point<double> (PR#157).
 - Fixed conflict between std::fill_n and boost::range::fill_n (PR#152).
 - Fixed issue with re-assignment of functor from for_each_pixel (PR#139).
 - Fixed missing template keyword prior to dependent name axis_iterator (PR#129).
Integer:
- boost/pending/integer_log2.hpp header is deprecated and will be removed in future releases. Use boost/integer/integer_log2.hpp instead.
Iostreams:
- Remove call to nonexistent member seekpos() of std::fpos (PR#58)
Iterator:
- Fixed compilation problems with ambiguous unqualified calls to advance and distance on iterators whose types involve types in the namespace boost. (#43)
LexicalCast:
- Fixed sign-conversion warnings #8991.
- Maintenance: dropped some dependencies on other Boost libraries, fixed build system warnings.
Log:
- General changes:
  - Updated syslog sink backend to avoid using deprecated Boost.ASIO interfaces. (#59)
- Bug fixes:
  - Fixed a possible incorrect estimation of the total size of rotated files in the target directory of a text file sink in some cases.
- See changelog for more details.
Logic:
- Breaking change: Use explicit operator bool when available (PR#5)
Math:
- Add LambertW functions.
- Update integration routines to support complex valued integrands and contour integrals.
- Added the derivative of the Barycentric rational approximation.
- Minor fixes to better support variable precision floating point types.
- Removed use of deprecated Boost.Endian in favour of Predef.
- Updated continued fraction and series evaluation code to support complex types.
- Prevent logic error leading to infinite loop in toms748_solve. See #138.
- Fix mean and standard_deviation for extreme_value_distribution. See #139.
- Improve heuristics used in newton_raphson_iterate. See #145.
- Fix result of erf(NaN). See #141 #141.
- Big push to reduce GCC warnings. See #136 #136.
- Refactor polynomial addition. See PR#132.
- Fix for vxWorks having a real function in the global namespace. See PR#131.
- Improve sinc approximations and add better tests.
- Fix typo in Student's T hypothesis testing documentation, see #143.
Mp11:
- Implemented the mp_starts_with facility (Glen Fernandes).
MultiArray:
- Improve C++11 allocator model support including: Support for C++11 minimal allocators, support for stateful allocators, using the allocator for construction and destruction of the value type, and using the empty base optimization for storing empty or stateless allocators (Glen Fernandes).
Multi-index Containers:
- Introduced an alternative terse key specification syntax for C++17 compliant environments.
Multiprecision:
- Big update to better support variable precision types so that the precision of the result is always the largest of all the arguments.
- Add support for allocators that are final in __cpp_int (Glen Fernandes).
- Removed use of deprecated Boost.Endian in favour of Predef.
- Add support for std::string_view.
- Fixed minor bug in constant initialization. See #67.
- Make assignment of non-finite value to cpp_int a runtime errors. See #58.
- Added typedefs for cpp_bin_float_oct and cpp_complex_oct.
PolyCollection:
- Added Boost.PolyCollection-specific versions of algorithms std::for_each_n and std::sample.
Pool:
- Replace boost::mutex use to avoid a dependency on Boost.Thread (PR#23)
Preprocessor:
- Supports the new C++ standard conforming preprocessor in VC++ 14.1, which is currently enabled by using the /experimental:preprocessor switch, in Visual Studio 2017 15.8 on up.
Rational:
- Add constexpr support (PR#28) (PR#32)
Spirit:
- Spirit.X3:
  - Drop own FP routines in favor of boost::math (#392) (#13531)
  - Missing visibility mark on exception types (#409)
  - to_utf8: Fixed wchar_t handling on Windows (#413) (#395)
- Spirit V2
  - Drop own FP routines in favor of boost::math (#392) (#13531)
  - Missing visibility mark on exception types (#409)
  - Fixed transform_attribute ambiguity (#407) (#396)
  - to_utf8: Fixed wchar_t handling on Windows (#413) (#395)
- Spirit.Classic:
  - Missing visibility mark on exception types (#409)
Stacktrace:
- libbacktrace usage was significantly improved. BOOST_STACKTRACE_USE_BACKTRACE or boost_stacktrace_backtrace users are encouraged to update:
  - Memory consumprion dropped down.
  - Stack capturing became faster by an order of magnitude.
  - syminfo fallback enabled to provide information for visible symbols even without debug information (thanks to github user driesdeschout!)#60, #61.
  - Exact location of the backtrace.h header now can be specified via BOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE, to allow backtrace.h header usage on platforms and compilers where that header is unreachable otherwise (for example Ubuntu Xenial + Clang) #59.
- Optimized stack capturing if max_depth is set (thanks to Jan Eisenhauer for the PR!) #67.
- Added to_string(const stacktrace& ) functions for fast conversion of stacktraces to std::string #57.
- Maintenance: updated docs #62, tests updated.
System:
- Boost.System is now header-only. A stub library is still built for compatibility, but linking to it is no longer necessary.
- Even more functions have been marked constexpr.
- The destructor of error_category is now protected and no longer virtual. This is a potentially breaking change, but its impact is expected to be limited.
- error_category now has a constructor that accepts a 64 bit identifier, enabling distinct category objects to compare equal.
- The constructors of error_category are now protected.
- A non-allocating, nonthrowing overload of message has been added.
- A virtual function failed has been added, allowing categories for which success is not synonymous with 0.
- The deprecated boost::system::throws object has been removed.
- boost::throws() is now deprecated and its use is discouraged.
- The constructor of system_error taking a single error_code argument is now explicit.
- system_error::code() now returns by value.
Test:
- Boost.test v3.9 see the Changes log for more details.
- New feature:
  - Official support of header-only variant of Boost.Test with multiple translation units.
  - Now possible to manually add a test case by specifying its name, with BOOST_TEST_CASE_NAME
  - Better support of boost::exception in the logs
- Bug fixes and pull requests:
  - Trac tickets: #13380, #13625, #13637
  - GitHub Issues: #149, #150, #156, #158, #163
  - GitHub Pull Requests: PR#147, PR#148, PR#151, PR#154, PR#161
TypeIndex:
- Fix the regression and speed up parsing of the boost/type_traits.hpp header by 30% (thanks to Nikita Kniazev for the PR!) #21.
Utility:
- Added support for non-inheritable empty types to boost::compressed_pair by avoiding the empty base optimization for types which are declared as final (Glen Fernandes).
Variant:
- Fixed issue with visibility. Now boost::bad_visit exception could cross the boundaries of shared library with hidden visibility and could be catched in other shared library with hidden visibility.
YAP:
- Minor changes to support MSVC++ version 14.15 (Visual Studio 2017 version 15.8).
- Doc fixes.

Discontinued Libraries

Signals (v1) is now removed. Its removal was announced in 1.68 and its deprecation was announced in 1.54. Boost 1.68 is the last release that provides this library. Users are encouraged to use Signals2 instead. The Boost community thanks Douglas Gregor for his work on Signals which served its users well and which also inspired Signals2.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1
- Clang, C++17: 5.0.2, 6.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0
- Clang, C++17: 5.0.2, 6.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
- Apple Clang, C++17: 9.1.0, 10.0.0
- Apple Clang, C++1z: 9.0.0
- Apple Clang, C++2a: 10.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Daniel James, Vladimir Prus, Marshall Clow and Michael Caisse managed this release.

Version 1.68.0

Thu, 09 Aug 2018 03:46:16 +0000

Notes for Windows users

Boost.WinAPI has been updated to target Windows 7 by default, where possible. In previous releases Windows Vista was the default.

Boost.WinAPI is used internally as the Windows SDK abstraction layer in a number of Boost libraries, including Boost.Beast, Boost.Chrono, Boost.DateTime, Boost.Dll, Boost.Log, Boost.Process, Boost.Stacktrace, Boost.System, Boost.Thread and Boost.UUID. To select the target Windows version define BOOST_USE_WINAPI_VERSION to the numeric version similar to _WIN32_WINNT while compiling Boost and user's code. For example:

    b2 release define=BOOST_USE_WINAPI_VERSION=0x0501 stage

The list of Windows API version numbers can be seen on this page.

New Libraries

YAP: An expression template library for C++14 and later, from Zach Laine.

Updated Libraries

Beast:
- This version fixes a missing executor work guard in all composed operations used in the implementation. Users who are experiencing crashes related to asynchronous completion handlers are encouraged to upgrade.
- For a complete list of changes, please view the official Release Notes.
Context:
- #78: Linker error with context-impl=ucontext: multiple definition of boost::context::detail::current_rec
Coroutine2:
- #14: crash while stack unwinding
- #18: some guidance on why to use coroutine2
- #20: failes to compile test in due to the error C2039
- #22: undefined behaviour documentation
Fiber:
- #170: buffered_channel::try_push has incorrect documentation
- #172: WIN64: 'invalid conversion from 'HANDLE' to 'std::thread::native_handle_type' errors for builds using mingw-w64
- #175: throw exception "Operation not permitted"
- NUMA support moved to extra library (fiber-numa); enabled via property numa (numa=on)
Fusion:
- Added a workaround for ambiguous call of fusion::deque constructor on GCC 4.4/c++0x (PR#178, commit).
- Fixed a bug with C-style array (PR#177).
- Fixed a fusion::for_each signature to take functor by value (#4427).
  - This may break existing code with non-copyable (non-movable) functor, but the implementation wasn't correct for a long time; the documantation was correct from the first. So, please make sure your usage.
- Fixed unintentional MPL placeholder substitution bug on fusion::transform (#5490).
- Moved description, how to conform Fusion sequence as MPL sequence, to mpl section (#4029).
- Added notes regarding IO facility for adapted type (#6091).
Geometry:
- Improvements
  - 469 Horizontal grid shift (nadgrids) in SRS transformations (undocumented for now due to potential interface changes).
  - 478 Box-Segment distance for spherical and geographic coordinate systems.
  - 487 Missing combinations of geometries in distance for spherical and geographic cs
  - 489 Additional direct geodesic problem formulas for internal use
- Solved issues
  - 470 Assertion failure with short spherical and geographic segments.
  - 471 Invalid envelope of spherical polygon
  - 498 Unexpected results with expand() and make_inverse() for spherical and geographic CS
  - 504 Unused parameter warnings.
- Bugfixes
  - 488 Handle non-true-references in closing_iterator and ever_circling_range_iterator
  - 495 VxWorks 7 cross-compilation issue.
GIL:
- Added
  - The library now requires a C++11-compliant compiler.
  - New top-level all-in-one include/boost/gil.hpp header (PR#70).
  - New Toolbox extension, reviewed and accepted into Boost.
- Changed
  - IO extensions have been entirely rewritten as IO v2, reviewed and accepted into Boost.
  - Documentation has been reformatted and updated.
- Removed
  - IO v1 extension has been replaced with IO v2.
Graph:
- Conditionally replace deprecated/removed C++98 std::bind1st by std::bind, std::auto_ptr by std::unique_ptr, and std::random_shuffle by std::shuffle. (PR#89)
- Fix compiler error with release builds on VS2015 (PR#84)
- Fix the Stanford GraphBase examples (PR#87)
- Fix friend declarations for iterator_core_access (PR#103)
- Add missing <boost/iterator.hpp> include (PR#104)
- Avoid an unused variable warning (PR#90)
- Fix some typos in documentation (PR#88, PR#98, PR#102)
- Fix some issues in tests and examples (PR#85, PR#105)
Lexical Cast:
- Fixes for clang-tidy warnings #12092
Log:
- Improved support for VxWorks. (PR#39)
- Save and restore ebx register on x86 PIE targets in the dump stream manipulator implementation.
Math:
- Support for arbitrary precision complex valued quadrature and hence contour integration
- Improve performance of polynomial addition
- Continue to improve numerical integration routines, and in particular add support for contour integrals.
- Improve accuracy of erfc function's rational approximations.
Multi-index Containers:
- Containers of moveable but non-copyable elements can now be serialized (ticket #13478). Thanks to Sébastien Paris for the report.
- multi_index_container's default constructor is no longer explicit (ticket #13518).
Multiprecision:
- Support added for complex multiprecision numbers.
- Changed conversion to unsigned integer types to be truncating to match standard defined behaviour.
- Correct bug in MPFR string formatting.
- Fix undefined behaviour in cpp_dec_float conversion from long long.
- Add support for Eigen interoperability.
- float128.hpp: Fix Intel on Windows build.
- Fix type used in temporaries when expanding expression templates containing mixed expressions.
- Fix infinite loop in gmp_float to fixed-point string conversion.
- Update the expression templates to issue static_asserts with better error messages when you try and do something unsupported.
- Fix bug in cpp_int where incrementing to zero doesn't set the sign correctly.
- Remove erroneous use of std::move, and rely on NVRO instead.
- Fix up support for changes to MPIR-3.0.
- Fix various conversion errors in cpp_bin_float when the exponent type is a long long, or else we're converting to an integer that is wider than we are.
- Fix compatibility issue with GCC-8 caused by the introduction of std::byte.
Optional:
- Added member function has_value() for compatibility with std::optional (issue #52).
- Added member function map() for transforming optional<T> into optional using a function of type T -> U.
- Added member function flat_map() for transforming optional<T> into optional using a function of type T -> optonal.
Predef:
- Add support for __ARM_ARCH macro. (from Tim Blechmann)
- Add detection for PTX architecture. (from Benjamin Worpitz)
- Add nvcc compiler detection. (from Benjamin Worpitz)
- Add support for detecting CUDA. (from Benjamin Worpitz)
- Remove reference to obsolete BOOST_ARCH_AMD64. (from Peter Kolbus)
Program Options:
- Support for multiple long names for an option, thanks to Eyal Rozenberg (PR#53)
Python:
- Bug fixes to correct autolink support (Windows) (#193)
Rational:
- Fixed undefined behavior in normalize() (PR#19).
System:
- Add constexpr to error_code and error_condition members under C++14 and above (PR#23).
Signals:
- Removal Notice: Boost.Signals will be removed in the next release. Boost.Signals was deprecated in version 1.54.0. Transition to Boost.Signals2 now to avoid disruption.
Spirit:
- Spirit.X3:
  - Small list parser optimization (PR#368).
  - Pass container attributes through sequence parser or unary ending down to a sequence parser (PR#370 #12085).
  - More fine grained sequence attribute check message (PR#371).
  - Removed redundant check in skip_over (PR#373).
  - Workaround constexpr in noexcept VS2015 bug in entire x3::variant (PR#379).
  - Fixed calc4b example compilation (PR#384).
  - Minor code improvements (PR#374).
- Spirit.Qi:
  - Fixed ADT support by permutation and sequence_or operator (PR#376).
  - Specialize iterator_source for random access (PR#383).
  - Removed redundant check in skip_over (PR#373).
- Spirit.Karma:
  - Fixed UB in get_absolute_value function (PR#246).
  - Fixed use after scope bug if ADT getter returns by value (PR#375 #6126).
- Spirit.Classic:
  - Fixed a regression introduced in PR#336 (PR#386).
  - Minor code improvements (PR#367).
Stacktrace:
- Fixed compilation on Solaris and other platforms that do qualify address as const in dladdr function (github 54).
- Dropped dependency on Boost.LexicalCast.
Test:
- Boost.test v3.8 see the Changes log for more details.
- Breaking changes
  - The master_test_suite_t object is no more copyable
- New feature:
  - Dataset test case can now use command line parameters
- Bug fixes and pull requests:
  - Trac tickets: #12095, #12953, #13504, #13525, #13528
  - Pull requests: PR#143, PR#145
TypeIndex:
- Dropped dependency on Boost.MPL.
Uuid:
- Breaking change: sha1 detail namespace header redirection for backwards compatibility was removed (PR#69).
- Added support for std::hash (PR#67).
- Added support for move semantics on random generators (PR#74).
- Properly handle EINTR when acquiring entropy (PR#74).
- Use getrandom(2) instead of getentropy(3) on linux (PR#75).

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1
- Clang, C++17: 5.0.2, 6.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0
- Apple Clang, C++11: 9.0.0, 9.1.0
- Apple Clang, C++14: 9.0.0, 9.1.0
- Apple Clang, C++17: 9.1.0
- Apple Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2, 6.0.1, 7.0.0
- Clang, C++17: 5.0.2, 6.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
- GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
- GCC, C++17: 7.3.0, 8.0.1
- Intel, C++14: 18.0
OS X:
- Apple Clang: 9.0.0, 9.1.0
- Apple Clang, C++11: 9.0.0, 9.1.0
- Apple Clang, C++14: 9.0.0, 9.1.0
- Apple Clang, C++17: 9.1.0
- Apple Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
- GCC, C++17: 7.1.0, 7.2.0, 7.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Daniel James, Vladimir Prus, and Marshall Clow managed this release.

Version 1.67.0

Sat, 14 Apr 2018 20:37:12 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release. Be careful as they have not been through the normal testing process.

Fix compiling with FreeBSD:
- /patches/1_67_0/0001-Fiber-Use-pthread_setaffinity_np-on-FreeBSD-as-well.patch
- /patches/1_67_0/0002-Wave-Avoid-using-wrong-T_DIVIDE-on-BSDs.patch
Fix Python auto-linking:
- /patches/1_67_0/0003-Python-Fix-auto-linking-logic-Windows-only.patch

New Libraries

Contract: Contract programming for C++. All contract programming features are supported: Subcontracting, class invariants, postconditions (with old and return values), preconditions, customizable actions on assertion failure (e.g., terminate or throw), optional compilation and checking of assertions, etc, from Lorenzo Caminiti.
HOF: Higher-order functions for C++, from Paul Fultz II.

Updated Libraries

Asio:
- Added missing const qualifier to basic_socket_acceptor::get_option.
- Worked around a parsing error that occurs with some versions of gcc.
- Fixed broken code samples in tutorial.
- Added new experimental features. (Note that "experimental" features may be changed without notice in subsequent releases.)
  - Added experimental::detached completion token.
  - Added experimental::redirect_error completion token.
  - Added experimental::co_spawn facility for integration with the coroutines technical specification.
  - Updated timeout examples to use latest features.
  - Used asio::steady_timer rather than asio::deadline_timer.
  - Used asio::dynamic_buffer rather than asio::streambuf.
  - Used timed asio::io_context::run_for() function for blocking clients.
  - Added example showing a custom completion token for blocking with timeouts.
- Fixed unit tests to compile when BOOST_ASIO_NO_DEPRECATED is defined.
- Changed socket iostreams to use chrono by default, to fix compatibility with the Networking TS. Define BOOST_ASIO_USE_BOOST_DATE_TIME_FOR_SOCKET_IOSTREAM to enable the old Boost.Date_Time interface in basic_socket_streambuf and basic_socket_iostream.
- Updated examples to use chrono rather than Boost.Date_Time.
- Fixed an incorrect member function detector in the is_dynamic_buffer trait.
- Fixed an async_result incompatibility with deprecated handler_type.
- Added a missing move optimisation in the SSL stream implementation.
- Fixed incorrect basic_resolver_results::value_type typedef.
- Fixed a compile error with some OpenSSL versions when SSL_OP_NO_COMPRESSION is defined.
- Changed add_certificate_authority to process multiple certificates in a bundle.
- Eliminated deprecation warning with MSVC by using std::invoke_result rather than std::result_of.
- Changed to use std::string_view for C++17 or later, and std::experimental::string_view for C++14. Define the preprocessor macro BOOST_ASIO_DISABLE_STD_STRING_VIEW to force the use of std::experimental::string_view (assuming it is available) when compiling in C++17 mode.
- Ensured DynamicBuffer template arguments are decayed before using in enable_if tests.
- Changed documentation to distinguish legacy completion handlers (which are still required to be CopyConstructible) from new MoveConstructible handlers.
- Suppressed a discarded return value warning in the buffer debugging support.
- Fixed basic_yield_context to work with completion signatures containing reference parameters.
- Ensured that stackful coroutines launched using spawn() correctly store decayed copies of their function and handler arguments.
- Fixed some compatibility issues with Android.
- Added cross-compilation support to Jamfiles.
- Fixed some minor portability issues in examples.
Atomic:
- Breaking change: Changed the result of the (op)_and_test operations added in Boost 1.66 to the opposite - the functions now return true if the operation result is non-zero. This is consistent with other test methods in Boost.Atomic and the C++ standard library. Users can define BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST when compiling their code to emit warnings on every use of the changed functions. This way users can locate the code that needs to be updated. (#11)
- Update for C++2a. On C++11 compilers that support scoped enums, the memory_order enumeration is now scoped and contains constants with shorter names like acquire, release or seq_cst (i.e. users can use memory_order::acquire instead of memory_order_acquire). The old constants are also provided for backward compatibility. (P0439R0)
- Update for C++2a. Added experimental support for atomic operations on floating point types. In addition to general operations, add, sub, negate operations and their fetch_(op) and opaque_(op) versions are supported. Lock-free property can be tested with the new macros BOOST_ATOMIC_FLOAT/DOUBLE/LONG_DOUBLE_LOCK_FREE. The support for floating point types is optional and can be disabled by defining BOOST_ATOMIC_NO_FLOATING_POINT. (P0020R6)
- Added new experimental operations:
 - negate_and_test and complement_and_test which perform negation or bitwise complement and return true if the result is not zero.
 - add, sub, negate, bitwise_and, bitwise_or, bitwise_xor, bitwise_complement operations which perform the operation and return its result.
- For generic atomic<T> specialization, the default constructor is now trivial if T's default constructor is.
- The internal implementation of atomic<T> has been updated to avoid undefined behavior that stems from signed integer overflows. As required by the C++ standard, the library uses two's complement representation of signed integers internally and accroding rules of overflow. Currently, the library requires the native signed integer types to also use two's complement representation (but no defined overflow semantics).
- Improved Clang support. In particular, fixed DCAS not being lock-free and fixed possible incorrect code generated on 32-bit x86.
- Improved MinGW support. For gcc versions up to 4.6, fixed compilation of DCAS on x86.
- In x86 PIE code, asm blocks now preserve ebx value.
Beast:
- This version fixes significant defects in websocket::stream which can lead to asserts or undefined behavior. Users are encouraged to update to the latest Boost release.
- For a complete list of changes, please view the official Release Notes.
ContainerHash:
- Extracted from the functional module to break a dependency cycle.
- Moved headers to new location to reflect name change, the old include paths will still work.
- Added support for std::string_view, std::error_code, std::error_condition, std::optional, std::variant, std::monostate where available.
- Added explicit support for vector<bool>, so that it will work with libc++ (#13501).
- More detail in the library change log.
Context:
- #62/PR#64: fix i386/macho routines to correctly return transfer_t in EAX/EDX
- #65: __sanitizer_finish_switch_fiber should be called directly after context switch
- #66: Clang on Windows : error: No best alternative for libs/context/build/asm_sources
- #73: fixing C2492 for execution_context (v1)
- known bug: including all.hpp + <context-impl>ucontext/winfib causes error 'forced_unwind: is not a member of boost::context::detail'
Core:
- Updated to_address and pointer_traits to reflect the design adopted for C++2a in P0653R2 (Glen Fernandes).
Coroutine2:
- #13: Pull coroutine does not rethrow an exception if it is thrown on the first entry
DateTime:
- Fixed various year 2038 (32-bit) issues (#2818) (#2819) (#3487) (#4543) (#8450) (#9158) (#9489) (#10570) (#12609)
- Fixed a binary serialization regression introduced in 1.66.0 (#56) (PR#58) (PR#70)
- Updated the timezone database file (#4430) (#10087) (PR#68)
- Enhanced from_iso_string so it can read output of to_iso_string for special values (#1078) (PR#69)
- Changed maximum supported year from 10000 to 9999 to resolve various issues (#13159) (#12630) (PR#71)
- boost::date_time::period_parser::delimiter_strings did nothing (#11142) (PR#63)
- Ensure special values are not automatically translated to integral types (#11168) (PR#64)
- int_adapter::is_signed should be const (#12363) (PR#60)
- boost::date_time::time_input_facet throws when using %j alone (#12910) (PR#59)
- Time input facet is not able to parse %e day (#13194) (PR#54)
- Improved Github CI build environment for better project metrics and quality (PR#52) (PR#72)
- Fixed various compiler warnings (#3606) (#9882) (PR#62)
DLL:
- Fixes for calling functions on dirty GetLastError() #16.
Fiber:
- #128: Assertion "! ctx->ready_is_linked()" when using condition_variable::wait_for
- #132: fatal error: 'stdexception' file not found
- #141: boost::fibers::async problem
- #146: remove unecessary lock of remote-ready-queue spinlock
- #153: docu: replace set_ready() by schedule()
- #154: Document iterators on channels
- #155: this_fiber is wrongly documented as being a member of boost::fibers
- #156: Many examples are using their own barrier.hpp
- #158: add BOOST_FIBERS_DECL to work_stealing class
- #162: remove use-coutner increment for timed wait ops
- #166: remove assertion for wait_is_linked() in schedule()
- #167: call shared_state::owner_destroyed() only if future was created from
- #168: fiber/doc/installing.qbk not not up to date
Filesystem:
- Fix static initialization issue that caused a crash if path operations were used before main() (PR#62, PR#43, PR#50, PR#59)
Fusion:
- Switch to SFINAE in template parameters on fusion::map to fix compile error on newer MSVC 2017. (PR#164)
- Fix for compilers not compatible with CWG defect 945 on fusion::vector. (PR#166)
- Added limits precheck on sequence converter to make error message clearer. (PR#168)
- Allow incomplete types in fusion::tag_of and fusion::is_native_fusion_sequence. Note that this changes no behaviour from previous release, but compliant to TypeTraits's change. (PR#171)
Geometry:
- Improvements:
  - New map projection and SRS transformation representations (undocumented for now due to potential interface changes).
  - New densify() algorithm.
  - No longer using std::iterator (thanks to Daniela Engert).
  - No longer using allocator directly in the rtree. Replaced with boost::container::allocator_traits (thanks to Daniela Engert).
  - Default rtree allocator changed to boost::container::new_allocator to still support move semantics emulation in C++03 with boost::container::allocator_traits.
  - Area strategies interface changed. This is potentially a breaking change.
  - Radius or Sphere can be passed into spherical strategies.
  - Added Point-Box and Box-Box spherical and geographic distance() strategies.
  - Simplify (multi)polygons will discard output rings of 2 points or (for closed polygons) 3 points, but it tries to avoid creating those
  - Simplify (multi)polygons will omit empty interior rings or polygons from output
- Solved issues:
  - 13386 Workaround for some gcc compilers
  - 13381 Compile error with matrix_transformer in Visual C++ 2015
  - 13436 Incorrectness in boost::geometry::model::polygon documentation
- Bugfixes:
  - Add missing strategy resolving in length() algorithm, affecting Variant support.
  - Simplify (multi)polygons now simplifies closing point
- Changes in behavior
  - Simplify (multi)polygons now usually rotates input rings before simplifying to select a non collinear point on its convex hull. This improves output.
Locale:
- Added support of unique_ptr interface in addition to C++2003 auto_ptr - in order to support C++2017, now you can use BOOST_LOCALE_HIDE_AUTO_PTR definiton to remove auto_ptr from the interfaces and prevent deprecated watnings.
- Fixed test problem with ICU >60.1
- Fix of solaris build
- Fixed wired FreeBSD/clang issue on optimized build. Probably compiler workaround
- Added workaround for failing MSVC tests due to 932 codepage codecvt issue
- Fixed bugs 6851, 12572, 12453
- Fixed missing throw in case of failure in icu/date_time
- Fixed build agains Boost.Thread v4
- Fixed Year of week instead of year ICU backend formatting
- Fixed formatting test for ICU 56.1 and above
Log:
- Improved compatibility with C++17: use allocator_traits to work with allocators instead of directly accessing its members.
- Improved compatibility with gcc 7 and later by updating library ABI namespace definition.
- Added documentation for the "Append" config file parameter for "TextFile" sinks. The parameter was supported previously, only the documentation was missing.
Math:
- Add naive Monte Carlo integration support.
- Add Chebyshev interpolation routines.
Multi-index Containers:
- Elements with overloaded operator& are now fully accepted (ticket #13307). Thanks to Daniel Frey for his updating Boost.Operators to help fix this issue.
- Avoided usage of std::allocator members deprecated in C++17. Contributed by Daniela Engert.
- Maintenance fixes.
Multiprecision:
- Breaking Change: When converting a multiprecision integer to a narrower type, if the value is too large (or negative) to fit in the smaller type, then the result is either the maximum (or minimum) value of the target type. This was always the intended behaviour, but was somewhat haphazardly enforced before. If you really do want just the low order N bits of a value, then you will need to mask these out prior to the case, for example: static_cast<unsigned>(~static_cast<unsigned>(0) & my_value). Note that technically (to avoid undefined behaviour) you should do the same thing with built in integer types too. See #13109.
- Fix bug in conversion of decimal to rational types (zero needs special handling), see #13148.
- Fix conversion from cpp_bin_float to a wider built in integer type, see #13301.
- Improve performance heurists used in cpp_bin_float exp function.
- Fix bug in floor/ceil and cpp_bin_float when the exponent type is wider than an int, see #13264.
- Disable explicit conversion operator when the target type is already constructible from this type, see #30.
- Fix support for changes new to MPIR-3.0, see #13124.
Optional:
- Fixed issue #46
- Fixed -Wzero-as-null-pointer-constant warnings.
Phoenix:
- Correct documentation and example code. (#8187, PR#56, PR#57)
- Fixed bug with initializing phoenix lazy from array types in C++11. (#12733, PR#58, PR#61)
- Use proto subscript and assignment overload operators buildins to fix compile error with some lambda experssions on recent MSVC. (#62, PR#64, PR#66, PR#67)
- Remove use of deprecated std::iteratror. Thanks to Daniela Engert. (PR#59)
PolyCollection:
- Maintenance fixes.
Python:
- The library name now includes the version suffix of the Python version used to compile it. For example, a variant compiled with Python 2.7 will produce library names boost_python27 and boost_numpy27, etc.. Combined with a related fix in Boost.Build, this means that it is now possible to build variants for multiple Python versions in a single build process.
Spirit:
- Spirit.X3:
 - Breaking change: Removed with_context (#239)
 - Added noexcept to x3::variant and forward_ast (#241)
 - CR+LF lines wrongly counted in error_handler::position() (#248)
 - Fixed unused_type attribute case in parse_into_container (#266)
 - Fixed parsing into associative containers (#289)
 - Fixed overflow problem in uint_parser<signed T> (#297)
 - Added VS2015 Update 3 support by using workarounds (#308)
 - Fixed include guard names collision with Qi (#313)
 - Added parsing into range (#316) (#12928)
 - Changed iterator concept static assert from ForwardIterator to ReadableIteratorConcept && ForwardTraversalConcept (#320)
 - Reenabled fusion::map support (#330)
 - Fixed string("...") and attr("...") to single item sequence (#337)
 - Dereference a single item view instead of unwrapping sequence (#340)
 - Prevent parse_nan from dereferencing out of range iterator (#351)
 - Use traits to test if container is empty (#355)
- Spirit V2
 - Fixed keyword directives compilation on C++11 (#256) (#11493)
 - Fixed subrules compilation (#279) (#259)
 - Fixed subrules use after scope bug (#284) (#5270)
 - Fixed undefined behavior in sequential or operator. Underlying parsers order of execution was dependent on compiler (#310)
 - Spirit was accidentally relaying on types typedef of boost::optional. The typedef was removed in the new optional implementation (#271) (#12349)
 - Fixed problems with BOOST_SPIRIT_NO_PREDEFINED_TERMINALS (attr_cast, confix, distinct, keywords, and flush_multi_pass) (#314) (#13311)
 - Added missing copy assignment operator to hold_any (#361) (#8268)
- Spirit.Qi:
 - Fixed alternate operator (#201) (#271) (#12349)
 - Fixed signed integer overflow in real parser (#245)
 - Fixed overflow problem in uint_parser<signed T> (#297)
 - Fixed get_current_line, get_line_start, and added get_line_end (#304)
 - Permutations parser were always initializing optionals (#319) (#12473)
 - Changed iterator concept static assert from ForwardIterator to ReadableIteratorConcept && ForwardTraversalConcept (#320)
 - Added assertations to real parsers to ensure that the parse_frac_n from user defined real policy does not return negative values and also to prevent static analyzers false-positives (#358)
- Spirit.Karma:
 - Fixed alternate operator (#271)
 - Fixed no_buffering_policy missing copy constructor (#261)
 - The ostream_iterator was inheriting std::iterator which is deprecated in C++17 (#345)
- Spirit.Lex:
 - Store id as promoted type to allow out-of-enum values (#247)
 - Fixed C2001 'newline in constant' warning in generated lexers (#324) (#11540)
- Spirit.Classic:
 - Fixed remove_reference usage without a namespace in Phoenix (#274)
 - Fixed std::complex usage without the include (#273)
 - Fixed compilation of match<T &> (#275)
 - Fixed compilation with BOOST_DISABLE_THREADS defined (#323) (#12639)
 - Increment scanner through iterator policy (#336) (#7371)
 - Removed deprecated in C++17 std::iterator usage (#345)
Stacktrace:
- Async safe dumping into files on Windows OS was causing hangs on some platforms and now is disabled #33. Users are encouraged to update to the latest Boost release.
- ContainerHash library is now used to reduce dependencies.
- Minor fixes (including #31, #38, #39, #40, #42).
Test:
- Boost.test v3.7 see the Changes log for more details.
- Breaking changes
  - Adding test cases with the same name to the same test suite is now reported as an error. See the changes log for more details.
- New feature:
  - Colour output on by default and available on Windows,
  - Improved and clearer command line help
  - BOOST_AUTO_TEST_CASE_TEMPLATE now accepts a sequence of types in an std::tuple
- Bug fixes and pull requests:
  - Trac tickets: #12092, #12596, #12597, #12969, #13058, #13149, #13170
  - Trac tickets: #13181, #13371, #13387, #13398, #13407, #13435, #13443
  - Pull requests: #112, #118, #118, #121, #122, #125, #127
TypeIndex:
- ContainerHash library is now used to reduce dependencies.
- Minor fixes (including #17)
TypeTraits:
- Added new traits detected, detected_or, is_detected, is_detected_convertible, is_detected_exact, is_complete.
- Added greatly improved code for detecting binary operators.
- Add assertions for completeness to traits which require complete types as arguments: this prevents various traits from giving eroneous results from incomplete types.
- Fix minor issue with mpl compatibility, see #12212.
- Add macro to indicate when is_constructible is fully implemented, see #12003.
- Update is_function and is_member_function_pointer to work correctly with C++17 noexcept specifications.
- Add workaround for is_default_constructible and std::pair.
- Added fallback for is_nothrow_swappable on pre-C++11 compilers.
Utility:
- Breaking change: <boost/utility.hpp> header no longer includes boost::next and boost::prior as they have been moved to the iterator module. Instead include <boost/next_prior.hpp>. Other uses of <boost/utility.hpp> are discouraged, it's better to use the header for the specific functionality instead.
Unordered:
- Template deduction guides.
- Standard conforming noexcept specifications for swap, operator= and node handles.
- Add element_type to iterators, so that std::pointer_traits will work.
- Support std::piecewise_construct on recent Visual C++ and Dinkumware libraries.
- Use std::iterator_traits rather than the boost iterator traits in order to remove dependency on Boost.Iterator.
- Iterators no longer inherit from std::iterator, as it's deprecated (PR#7).
- More detail in the library change log.
Units:
- Fix sqrt for scaled units #10270 #27
- Add constexpr support #22
- minor documentation fixes
Uuid:
- Breaking change: random_generator is no longer copyable (#61)
- Optimized random_generator to use OS-provided entropy directly (PR#53)
- Provide random_generator_mt19937 for bulk UUID generation
- Handle entropy acquisition errors instead of ignoring them
- Support for Windows UWP (#24)
- Support for CloudABI
Variant:
- Substitute function arguments on compilers with variadic templates support and do not generate substitution metafunctions using preprocessor #42, #46. Many thanks to Nikita Kniazev for providing an initial fix.
- Perfect forwarding for passing visitor in apply_visitor #40, #13288. Many thanks to Paweł Dac!
- Minor fixes (including #41, #44)

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 5.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.1
- Clang, C++17: 5.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 7.2.0
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 7.2.0
- GCC, C++14: 5.4.0, 5.4.1, 6.3.0, 6.4.0, 7.1.0, 7.2.0, 7.3.0
- GCC, C++17: 7.2.0
- Intel, C++14: 18.0
OS X:
- Clang: 9.0.0
- Clang, C++11: 9.0.0
- Clang, C++14: 9.0.0
- Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0, 7.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 4.0.1, 5.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.1
- Clang, C++17: 5.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 4.9.2, 5.4.0, 7.2.0
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 7.2.0
- GCC, C++14: 5.4.0, 5.4.1, 6.3.0, 6.4.0, 7.1.0, 7.2.0, 7.3.0
- GCC, C++17: 7.2.0
- Intel, C++14: 18.0
OS X:
- Clang: 9.0.0
- Clang, C++11: 9.0.0
- Clang, C++14: 9.0.0
- Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0, 7.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0

Acknowledgements

Beman Dawes, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.66.0

Mon, 18 Dec 2017 13:58:14 +0000

Note about the new Visual Studio release

Visual Studio 15.5 was released too late for us to test this release with it.

New Libraries

Beast: Portable HTTP, WebSocket, and network operations using only C++11 and Boost.Asio, from Vinnie Falco.
CallableTraits: A spiritual successor to Boost.FunctionTypes, Boost.CallableTraits is a header-only C++11 library for the compile-time inspection and manipulation of all 'callable' types. Additional support for C++17 features, from Barrett Adair.
Mp11: A C++11 metaprogramming library, from Peter Dimov.

Updated Libraries

Asio:
- Implemented interface changes to reflect the Networking TS (N4656).
 - See the list of new interfaces and, where applicable, the corresponding old interfaces that have been superseded.
 - The service template parameters, and the corresponding classes, are disabled by default. For example, instead of basic_socket<Protocol, SocketService> we now have simply basic_socket<Protocol>. The old interface can be enabled by defining the BOOST_ASIO_ENABLE_OLD_SERVICES macro.
- Removed previously deprecated functions.
- Added support for customised handler tracking.
- Added reactor-related (i.e. descriptor readiness) events to handler tracking.
- Added special "concurrency hint" values that may be used to disable locking on a per io_context basis.
- Enabled perfect forwarding for the first ssl::stream<> constructor argument.
- Added ability to release ownership of the underlying native socket. (Requires Windows 8.1 or later when using the I/O completion port backend.)
Atomic:
- Implemented a set of experimental extended atomic operations for integral types:
 - fetch_negate, fetch_complement - atomically replaces the value with a negated or binary complemented value and returns the original value
 - opaque_<op> - equivalent to fetch_<op> except that it doesn't return the original value
 - <op>_and_test - atomically applies <op> and returns true if the result is zero. Note: The result of these operations will change to the opposite in Boost 1.67. The code that uses these functions will need to be updated.
 - bit_test_and_set, bit_test_and_reset, bit_test_and_complement - atomically sets, resets or complements the specified bit and returns the original value of the bit
- Following C++17 (P0558R1), arithmetic operations for pointers to non-object types are no longer provided.
- Also following C++17 exposed atomic<T>::value_type and atomic<T>::difference_type member typedefs, where applicable, to the user's code.
- Improved compatibility with gcc 7. In particular, using 128-bit operations on x86-64 should no longer require linking with libatomic (the compiler-supplied library).
DateTime:
- The library has been converted to use Boost.WinAPI as the abstraction layer for Windows SDK.
- Fixed an integral overflow that could cause incorrect results when adding or subtracting many years from a date (see here).
Fiber:
- synchronization with CUDA streams
- synchronization with ROCm/HIP streams
Format:
- Improvements:
  - Accept new conversion specifiers:
    
    a: sets flags fixed | scientific (i.e. hexfloat)
    
    b: sets flag boolalpha
    
    A: same as a plus flag uppercase
    
    F: same as f plus flag uppercase
  - 42 Accept new argument types j and z from ISO C99 (parsed and ignored like all others).
  - 44 Accept new argument types I, I32, I64, and w from Microsoft (parsed and ignored like all others).
  - 33 Added a development tool called format_matrix that exercises as many different combinations of format strings as possible and logs them to a file:
    
    helps prevent regressions in between boost releases
    
    allows for comparison against snprintf
- Bugfixes:
  - 36 Safely allow volatile arguments to be used with operator%
  - 4636 Explicit clamping provided to allow MSVC /RTCc to succeed
  - 7477 Fix compatibility with MSVC /Za
  - 10324 Const-correct cast issue resolved
  - 11632 Fix -fsanitize=undefined issue in alt_sstream.hpp
Fusion:
- PR#149 isspace(c) is not a macro in Dinkum clib for VxWorks, thanks to Brian Kuhl(@kuhlenough).
- PR#150 Remove circular preprocessor include, thanks to Gregor Jasny(@gjasny).
- PR#151 Change base of fusion::tuple.
- PR#153 Fixed compile error with std::array.
- PR#154 Fixed bugs nesting and copying on c++03.
Geometry:
- Improvements:
  - Add distance for geographic PointLike/AnyGeometry.
- Bugfixes:
  - Fixes in results of union/intersection/difference which could be incorrect in very complex cases
  - Fixes in validity of union/intersection/difference/buffer
  - Fixes in set and relational operations for non-cartesian coordinate systems.
Iterator:
- next()/prior() functions now support user's iterators that don't specify nested types such as iterator_category, difference_type, etc. and instead specialize std::iterator_traits to define those types. The compiler must support C++17-compatible std::iterator_traits for this to work.
Log:
- Bug fixes:
  - Fixed a bug in file_collector::scan_for_files that could cause incorrectly named log files in the target directory after the user's application restart.
- See changelog for more details.
Math:
- New Features:
  - Add Gauss and Gauss-Kronrod quadrature routines.
  - Add double-exponential (tanh-sinh, exp-sinh and sinh-sinh) quadrature routines.
  - Add Chebyshev polynomial evaluation, roots, integration, differentiation, and interpolation routines.
Multi-index Containers:
- Made modify and modify_key more robust so that the modified element is erased if the modifier throws or the rollback functor does not properly restore the element (full discussion at ticket #12542). This is technically backwards incompatible; for instance, the following code:
```
c.modify(c.begin(),[](auto&){throw 0;});
```
  keeps the container c untouched in former versions of Boost whereas now c.begin() is erased. Thanks to Jon Kalb for raising the issue.
- Maintenance fixes.
Optional:
- On newer compilers optional is now trivially-copyable for scalar Ts. This uses a different storage (just T rather than aligned_storage). We require the compiler to support defaulted functions.
- Changed the implementation of operator== to get rid of the -Wmaybe-uninitialized false-positive warning from GCC.
PolyCollection:
- Boost.PolyCollection has been backported to GCC 4.8 to 4.9 and Clang 3.3 to 3.6. The version of libstdc++-v3 shipped with GCC 4.8 (which can also be used by Clang) has deficiencies that result in the following limitations when using Boost.PolyCollection:
  - Stateful allocators are not properly supported.
  - Allocator-extended move construction decays to allocator-extended copy construction.
  - Copy construction crashes if an exception is thrown during element copying.
- Maintenance fixes.
Predef:
- Improved Windows Universal Platform detection. (from James E. King, III)
- Add detection for CloudABI with cloudlibc. (from James E. King, III)
- Various other bug fixes.
Regex:
- Bug fixes:
  - Numerous small fixes for security issues discovered by de-fuzzing.
Stacktrace:
- Now works out-of-the-box on MinGW-w64.
- Now works on MinGW (without -w64) if libbacktrace is properly installed. See "MinGW specific notes" section in documentation for more info.
Thread:
- Bugs Fixes
  - #12323 windows - boost/thread/win32/mfc_thread_init.hpp has wrong signature for _pRawDllMainOrig
  - #12730 windows - static threads library is incompatible with MSVC 2017 RC
  - #12976 Boost Thread Executors documentation mistakes
  - #12949 using sleep_for in a thread context without including boost/thread/thread.hpp yields incorrect behaviour when BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC is defined
  - #13019 ABI compatibility for BOOST_THREAD_PROVIDES_INTERRUPTIONS incomplete
  - #13069 Boost unit test "sync_pq_multi_thread_p_lib.exe" hung in thread library
  - #13163 boost::detail::heap_new does not have a variadic variant
  - #13226 getpagesize() is deprecated since 199506L
  - #132 VS 2017.4 Preview deadlocks on Test 10964
  - #133 windows - Spurious timing test failures on windows
  - #134 VS 2017.4 Preview deadlock in sync_pq_multi_thread_p_lib.exe
  - #135 VS 2017.4 Preview test_scheduled_tp_p.exe deadlock
  - #136 VS 2017.4 Preview test_scheduler_p.exe deadlock
  - #137 VS 2017.4 Preview executor_ex.exe deadlock
  - #143 Failures on msvc-12.0
  - #145 Clang build error with BOOST_THREAD_ATTRIBUTE_MAY_ALIAS
- New Experimental Feature
  - #116 [Proposal] Add APIs for deferred set_value/exception
Utility:
- boost/next_prior.hpp has been moved to Boost.Iterator. No changes needed to the user's code.
Uuid:
- Improvements:
  - 26 Refactored name_generator to support a configurable hash provider concept and provide an optional MD5 hash implementation per RFC-4122. This will make it easier to support whatever becomes the next standard hash algorithm.
  - 34 Added RFC-4122 namespaces in boost::uuids::ns.
- Bugfixes:
  - 8630 11482 12253 Various deficiencies in string_generator were resolved.
  - 10665 name_generator::operator() is now const, matching docs.
  - Detail headers were moved into the detail subdirectory. No changes needed to user's code, however you may get build warnings if you use the old header location.
Variant:
- boost::apply_visitor now does perfect forwarding of visitables #6971. Great thanks to Levon Tarakchyan for implementing this feature.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 5.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.1
- Clang, C++17: 5.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.4.0, 7.2.0
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.2, 4.7.3, 4.8.5, 4.9.4, 6.4.0, 7.1.0, 7.2.0
- GCC, C++14: 5.4.1, 6.3.0, 6.4.0, 7.1.0, 7.2.0, 7.2.1
- GCC, C++17: 7.2.0
- Intel: 18.0
OS X:
- Clang: 9.0.0
- Clang, C++11: 9.0.0
- Clang, C++14: 9.0.0
- Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4
- GCC, C++14: 6.2
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0
QNX:
- QCC, C++0x: 4.4.2
- QCC, C++11: 4.7.3

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 4.0.1, 5.0.1
- Clang, C++0x: 3.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.1
- Clang, C++17: 5.0.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.4.0, 7.2.0
- GCC, C++0x: 4.4.7
- GCC, C++11: 4.7.2, 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 7.2.0
- GCC, C++14: 5.4.1, 6.3.0, 6.4.0, 7.1.0, 7.2.0, 7.2.1, 8.0.0
- GCC, C++17: 7.2.0
- Intel: 18.0
OS X:
- Clang: 9.0.0
- Clang, C++11: 9.0.0
- Clang, C++14: 9.0.0
- Clang, C++1z: 9.0.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++0x: 4.6.4
- GCC, C++11: 4.7.3, 4.8.1, 4.9.3
- GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0, 7.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4
- GCC, C++14: 6.2
FreeBSD:
- Clang: 4.0.0
- Clang, C++11: 4.0.0
- Clang, C++14: 4.0.0
- Clang, C++1z: 4.0.0
QNX:
- QCC, C++0x: 4.4.2
- QCC, C++11: 4.7.3

Acknowledgements

Beman Dawes, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.65.1

Thu, 07 Sep 2017 17:31:22 +0000

Fixes in 1.65.1

Config:
- Version macro changes for CUDA.
- Update last known MSVC version.
- MSVC 14.11 supports structured bindings.
Context:
- Return a continuation from functions executed by resume_with.
Fiber:
- Return a continuation from functions executed by resume_with.
Smart Pointers:
- Fix Visual C++ version checks.
- Fix compilation for NVCC with host compiler clang.
Stacktrace:
- Update build testing file to detail with a MinGW issue.
- Change preprocessor file extensions to work with the installation system.
- Support FreeBSD and other OSs that do not define _GNU_SOURCE but have _Unwind_Backtrace function.
Thread:
- Fix bug in boost::condition_variable on Windows (#130).

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 4.0.1, 5.0.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0.0
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 5.0.0
- Clang, C++17: 5.0.0
- Clang, C++1z: 4.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.4.0, 7.1.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0
- GCC, C++14: 5.4.0, 5.4.1, 6.3.0, 6.4.0, 7.1.0, 7.2.0
- GCC, C++17: 7.1.0
- GCC, C++1z: 6.3.0
- Intel: 17.0
OS X:
- Clang: 8.1.0
- Clang, C++11: 8.1.0
- Clang, C++14: 8.1.0
- Clang, C++1z: 8.1.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++11: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0, 7.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4
- GCC, C++14: 6.2
FreeBSD:
- Clang: 3.8.0
- Clang, C++11: 3.8.0
- Clang, C++14: 3.8.0
- Clang, C++1z: 3.8.0
QNX:
- QCC, C++11: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5_next, 12.5
- Oracle Solaris Studio, C++11: , 12.5_next, 12.5

Acknowledgements

Beman Dawes, Daniel James, Vladimir Prus and Marshall Clow managed this release.

New Libraries in 1.65.0

PolyCollection: Fast containers of polymorphic objects, from Joaquín M López Muñoz.
Stacktrace: Gather, store, copy and print backtraces, from Antony Polukhin.
- Note: Library has issue with MinGW and may produce empty backtraces with that compiler.

Removed Libraries in 1.65.0

Updated Libraries in 1.65.0

Asio:
- Changed to require g++ versions >= 4.7 to use standard atomics, to fix a linker error when using g++ 4.6 (#13121).
- Enabled use of constexpr and variadic templates with recent MSVC versions.
- Fixed a race condition in the Linux epoll backend, which may occur when a socket or descriptor is closed while another thread is blocked on epoll.
- Eliminated use of deprecated auto_ptr.
- Fixed misplaced use of asio_handler_is_continuation result in reactive async_accept implementation.
- Changed to use poll.h rather than sys/poll.h on some modern POSIX platforms (#12419).
- Fixed MSVC intellisense detection.
- Disabled use of the __thread keyword extension for android/clang/x86 targets.
Context:
- Improvements:
  - call/cc supports ucontext-API (swapcontext)
  - call/cc supports Windows-Fiber-API
  - call/cc supports on demand growing (segmented/split) stacks
- Bugfixes:
  - #12719: context test cases and examples segmentation fault when built with mingw-w64 toolchain
  - #52: Failing to build callcc test with g++-4.9
- important:
  - required bug fix 420554fe9ac01482990e8ae314f4f7ba81010c9a not included in 1.65
Config:
- Added BOOST_NO_CXX11_POINTER_TRAITS, BOOST_NO_CXX17_FOLD_EXPRESSIONS, BOOST_NO_CXX17_INLINE_VARIABLES, BOOST_NO_CXX17_STRUCTURED_BINDINGS defect detection.
- BOOST_FALLTHROUGH support for GCC 7 and above. (Glen Fernandes)
Core:
- Implemented pointer_traits for C++03 and higher, that implements P0653r0 (Glen Fernandes). This implementation is now used by Align, Circular Buffer, Fiber, Geometry, among other libraries.
- Added BOOST_TEST_GT and BOOST_TEST_GE to Lightweight Test.
Coroutine2:
- supports ucontext-API (swapcontext)
- supports Windows-Fiber-API
- #13064: different behavior coroutine and coroutine2
DLL:
- Fix PE parsing on non Windows platforms.
Fiber:
- Improvements:
  - hardware transactional memory (Intel TSX) supported
  - NUMA supported
  - ucontext-API (swapcontext) supported
  - Windows-Fiber-API supported
  - on demand growing stacks
- Bugfixes:
  - #121: failing to build static lib with GCC 4.8 and C++11
  - #123: assertion failure in schedule_from_remote
  - #125: erratic crashes in testsuite
  - #126: incorrect std::memory_order value in compare_exchange_strong?
- important:
  - required bug fix 63f1041f0e484e64dec437a0fa780ea2463abda2 not included in 1.65
Fusion:
- MSVC 14.1 supports variadic containers, such as fusion::vector, fusion::deque, fusion::map, fusion::set, and fusion::tuple. (#12986)
Geometry:
- Improvements:
  - Add correct() overload taking area strategy
  - Add is_convex() overload taking side strategy
  - Add missing relational operations (covered_by, crosses, equals, etc.) for MultiPoint/AnyGeometry
- Solved issues:
  - 12410 Lack of support of geographic coordinate system in correct()
  - 13035 Wrong result of non-cartesian intersection strategies for segments near poles.
  - 13057 Wrong result of intersects() for linestrings caused by numerical issue in disjoint() for boxes.
- Bugfixes:
  - Fix is_valid which could return false for multipolygons where an interior ring touches another interior ring
  - Fix is_valid which could return false for multipolygons where a polygon was located in an interior ring, all touching each other
  - Fix union which could produce invalid results (for some cases, this needs to define BOOST_GEOMETRY_INCLUDE_SELF_TURNS)
  - Fix intersection (idem), but some cases are still not yet valid
  - Fix difference (idem), but some cases are still not yet valid
  - Fix propagation of area strategy into the internals of various algorithms from intersection strategy
  - Fix uninitialized variable in relate and reference to temporary in overlay
  - Fix error in disjoint for geographic Segment/Box
  - Fix handling of non-cartesian geometries in various algorithms
Hash:
- Support for char16_t, char32_t, u16string, u32string.
Log:
- General changes:
  - Improved compatibility with Solaris.
- See changelog for more details.
Phoenix:
- Corrected some documentation. (PR#50)
- phoenix::erase with associative container returns iterator in C++11 mode. (#7423)
- std::set and std::multiset should be worked with predefined lazy functions. (PR#52)
- Disable phoenix::random_shuffle in C++17. (PR#53)
- Don't forward declare, include instead. (#11875)
Predef:
- Fix Intel C/C++ version 9999 detection to be 12.1.0.
- Addition of BOOST_PREDEF_WORKAROUND and BOOST_PREDEF_TESTED_AT macros for defect workarounds and detection.
- Add ARM64 MSVC SIMD detection. (from Minmin Gong)
- Add detection of iOS simulator vs device as a platform choice. (from Ruslan Baratov)
- Fix MinGW incorrect header guard. (from Ruslan Baratov)
Program Options:
- Support for storing values into boost::optional, thanks to Ed Catmur (#7495, PR#18)
- Parsing of implicit options can now use the value from the next token. Since 1.59, unless the value of implicit option was specified in the same token as the option itself, the implicit value was used. That proved inconvenient, and now we again check the next token and use it as value if it's not an option itself. (#25)
Python:
- eval(), exec(), and exec_statement() now allow char const * arguments, in addition to boost::python::str.
- The boost::python::numeric API has been removed, as it is being obsoleted by boost::python::numpy.
- Fix some build issues when using Python3 with MSVC.
Smart Pointers:
- New class templateatomic_shared_ptr, that provides thread-safe atomic pointer operations over shared_ptr. (Peter Dimov)
- New class template local_shared_ptr, where the reference count is updated with non-atomic operations. (Peter Dimov)
- More optimizations in allocate_shared and make_shared for arrays. (Glen Fernandes)
- Documentation has been completely rewritten in Asciidoc format.
Test:
- Boost.test v3.6 see the Change log section for more details.
- New feature:
  - C++17 compatibility (tested on VS2017), thanks to Daniela Engert
  - Direct comparison of C-arrays in BOOST_TEST
  - Better global fixtures mechanism, and spitting of responsibilities with BOOST_TEST_GLOBAL_FIXTURE for global fixtures and BOOST_TEST_GLOBAL_CONFIGURATION for global initialization (compile time configuration).
  - Improved support for fixtures (setup / teardown member function) which enables better teardown time checks
- Breaking changes
  - Some API changes for the loggers
  - Deprecating BOOST_GLOBAL_FIXTURE in favor of BOOST_TEST_GLOBAL_FIXTURE and BOOST_TEST_GLOBAL_CONFIGURATION (see above)
- Bug fixes
  - Trac tickets #5282, #5563, #11471, #11962, #12228
  - Trac tickets #12631, #13011
  - Pull request PR106
Thread:
- Important Regression on Windows:
 - #130 windows: Bug in boost::condition_variable on Windows Please, merge these two patches
 - https://github.com/boostorg/thread/commit/fdc0cbcd8ce8f34a19c7cdaf6f1fa679f0a49657
 - https://github.com/boostorg/thread/commit/395e3d786bc1dce9c60eb84da85f5845a2c1fb3d
- Bug fixes
 - #6787 boost::thread::sleep() hangs if system time is rolled back
 - #12519 boost::thread::try_join_for does not return after timeout
 - #12874 future<> extension constructor must be under BOOST_THREAD_PROVIDES_FUTURE_UNWRAP
 - #12888 Linking with boost thread does not work on mingw/gcc 4.4
 - #12958 sync_bounded_queue::wait_pull_front( lve ) might throw
 - #13077 Linking to static 64bit libboost_thread fails DLL initialization
 - #13155 log doesn't build on a system with pthreads
 - #121 on_tls_prepare is broken under VS2017
TypeIndex:
- Include <boost/functional/hash.hpp> if required, thanks to Ed Catmur #13009.
- Use native hash_code() when possible on GCC-like compilers #13027.
- Fix ctti_type_index for GCC 7 and later, thanks to Benjamin Buch PR16.
Typeof:
- Fix compilation error with clang-cl ticket 11821.
Unordered:
- Use the same data structure for unordered_set and unordered_multiset, and forunordered_map and unordered_multimap. This is required for C++17, so that nodes can be merged and extracted between compatible containers.
- Add deprecated attributes to long deprecated functions.
- Improved use of allocator_traits construct and destroy on C++11 compilers, using piecewise pair construction when appropriate.
- Fewer workarounds on newer Oracle compilers.
- Avoid dereferencing pointers to uninitialized memory (PR #5).
Utility:
- Improved compatibility of boost::next/boost::prior with SFINAE-unfriendly iterators. #10847, #13002.
Variant:
- r-value overload for boost::get was added by Albert Sverdlov #13018.
- Missing include fro <boost/variant/polymorphic_get.hpp> header was added by Adam Badura #13037.
- boost::make_variant_over was fixed and now works with views and other Forward Sequences (thanks to Mikhail Maksimov for the fix) #8554, #10041, PR#35.

Version 1.65.0

Mon, 21 Aug 2017 20:50:17 +0000

Known Issues

These are patches from library authors which were found too late to be fixed in the release. Be careful as they have not been through the normal testing process.

Combined patch for fixes to issues: boost_1_65_0.patch. Use patch -p1 < boost_1_65_0.patch from the root of the boost repo to apply. Or you can apply the patches individually below.

Context and Fiber don't return continuations when they should:
- Context patch
- Fiber patch
Thread: Bug in boost::condition_variable on Windows:
- Thread patch 1
- Thread patch 2

New Libraries

PolyCollection: Fast containers of polymorphic objects, from Joaquín M López Muñoz.
Stacktrace: Gather, store, copy and print backtraces, from Antony Polukhin.
- Note: Library has issue with MinGW and may produce empty backtraces with that compiler.

Removed Libraries

Updated Libraries

Asio:
- Changed to require g++ versions >= 4.7 to use standard atomics, to fix a linker error when using g++ 4.6 (#13121).
- Enabled use of constexpr and variadic templates with recent MSVC versions.
- Fixed a race condition in the Linux epoll backend, which may occur when a socket or descriptor is closed while another thread is blocked on epoll.
- Eliminated use of deprecated auto_ptr.
- Fixed misplaced use of asio_handler_is_continuation result in reactive async_accept implementation.
- Changed to use poll.h rather than sys/poll.h on some modern POSIX platforms (#12419).
- Fixed MSVC intellisense detection.
- Disabled use of the __thread keyword extension for android/clang/x86 targets.
Context:
- Improvements:
  - call/cc supports ucontext-API (swapcontext)
  - call/cc supports Windows-Fiber-API
  - call/cc supports on demand growing (segmented/split) stacks
- Bugfixes:
  - #12719: context test cases and examples segmentation fault when built with mingw-w64 toolchain
  - #52: Failing to build callcc test with g++-4.9
- important:
  - required bug fix 420554fe9ac01482990e8ae314f4f7ba81010c9a not included in 1.65
Config:
- Added BOOST_NO_CXX11_POINTER_TRAITS, BOOST_NO_CXX17_FOLD_EXPRESSIONS, BOOST_NO_CXX17_INLINE_VARIABLES, BOOST_NO_CXX17_STRUCTURED_BINDINGS defect detection.
- BOOST_FALLTHROUGH support for GCC 7 and above. (Glen Fernandes)
Core:
- Implemented pointer_traits for C++03 and higher, that implements P0653r0 (Glen Fernandes). This implementation is now used by Align, Circular Buffer, Fiber, Geometry, among other libraries.
- Added BOOST_TEST_GT and BOOST_TEST_GE to Lightweight Test.
Coroutine2:
- supports ucontext-API (swapcontext)
- supports Windows-Fiber-API
- #13064: different behavior coroutine and coroutine2
DLL:
- Fix PE parsing on non Windows platforms.
Fiber:
- Improvements:
  - hardware transactional memory (Intel TSX) supported
  - NUMA supported
  - ucontext-API (swapcontext) supported
  - Windows-Fiber-API supported
  - on demand growing stacks
- Bugfixes:
  - #121: failing to build static lib with GCC 4.8 and C++11
  - #123: assertion failure in schedule_from_remote
  - #125: erratic crashes in testsuite
  - #126: incorrect std::memory_order value in compare_exchange_strong?
- important:
  - required bug fix 63f1041f0e484e64dec437a0fa780ea2463abda2 not included in 1.65
Fusion:
- MSVC 14.1 supports variadic containers, such as fusion::vector, fusion::deque, fusion::map, fusion::set, and fusion::tuple. (#12986)
Geometry:
- Improvements:
  - Add correct() overload taking area strategy
  - Add is_convex() overload taking side strategy
  - Add missing relational operations (covered_by, crosses, equals, etc.) for MultiPoint/AnyGeometry
- Solved issues:
  - 12410 Lack of support of geographic coordinate system in correct()
  - 13035 Wrong result of non-cartesian intersection strategies for segments near poles.
  - 13057 Wrong result of intersects() for linestrings caused by numerical issue in disjoint() for boxes.
- Bugfixes:
  - Fix is_valid which could return false for multipolygons where an interior ring touches another interior ring
  - Fix is_valid which could return false for multipolygons where a polygon was located in an interior ring, all touching each other
  - Fix union which could produce invalid results (for some cases, this needs to define BOOST_GEOMETRY_INCLUDE_SELF_TURNS)
  - Fix intersection (idem), but some cases are still not yet valid
  - Fix difference (idem), but some cases are still not yet valid
  - Fix propagation of area strategy into the internals of various algorithms from intersection strategy
  - Fix uninitialized variable in relate and reference to temporary in overlay
  - Fix error in disjoint for geographic Segment/Box
  - Fix handling of non-cartesian geometries in various algorithms
Hash:
- Support for char16_t, char32_t, u16string, u32string.
Log:
- General changes:
  - Improved compatibility with Solaris.
- See changelog for more details.
Phoenix:
- Corrected some documentation. (PR#50)
- phoenix::erase with associative container returns iterator in C++11 mode. (#7423)
- std::set and std::multiset should be worked with predefined lazy functions. (PR#52)
- Disable phoenix::random_shuffle in C++17. (PR#53)
- Don't forward declare, include instead. (#11875)
Predef:
- Fix Intel C/C++ version 9999 detection to be 12.1.0.
- Addition of BOOST_PREDEF_WORKAROUND and BOOST_PREDEF_TESTED_AT macros for defect workarounds and detection.
- Add ARM64 MSVC SIMD detection. (from Minmin Gong)
- Add detection of iOS simulator vs device as a platform choice. (from Ruslan Baratov)
- Fix MinGW incorrect header guard. (from Ruslan Baratov)
Program Options:
- Support for storing values into boost::optional, thanks to Ed Catmur (#7495, PR#18)
- Parsing of implicit options can now use the value from the next token. Since 1.59, unless the value of implicit option was specified in the same token as the option itself, the implicit value was used. That proved inconvenient, and now we again check the next token and use it as value if it's not an option itself. (#25)
Python:
- eval(), exec(), and exec_statement() now allow char const * arguments, in addition to boost::python::str.
- The boost::python::numeric API has been removed, as it is being obsoleted by boost::python::numpy.
- Fix some build issues when using Python3 with MSVC.
Smart Pointers:
- New class templateatomic_shared_ptr, that provides thread-safe atomic pointer operations over shared_ptr. (Peter Dimov)
- New class template local_shared_ptr, where the reference count is updated with non-atomic operations. (Peter Dimov)
- More optimizations in allocate_shared and make_shared for arrays. (Glen Fernandes)
- Documentation has been completely rewritten in Asciidoc format.
Test:
- Boost.test v3.6 see the Change log section for more details.
- New feature:
  - C++17 compatibility (tested on VS2017), thanks to Daniela Engert
  - Direct comparison of C-arrays in BOOST_TEST
  - Better global fixtures mechanism, and spitting of responsibilities with BOOST_TEST_GLOBAL_FIXTURE for global fixtures and BOOST_TEST_GLOBAL_CONFIGURATION for global initialization (compile time configuration).
  - Improved support for fixtures (setup / teardown member function) which enables better teardown time checks
- Breaking changes
  - Some API changes for the loggers
  - Deprecating BOOST_GLOBAL_FIXTURE in favor of BOOST_TEST_GLOBAL_FIXTURE and BOOST_TEST_GLOBAL_CONFIGURATION (see above)
- Bug fixes
  - Trac tickets #5282, #5563, #11471, #11962, #12228
  - Trac tickets #12631, #13011
  - Pull request PR106
Thread:
- Important Regression on Windows:
 - #130 windows: Bug in boost::condition_variable on Windows Please, merge these two patches
 - https://github.com/boostorg/thread/commit/fdc0cbcd8ce8f34a19c7cdaf6f1fa679f0a49657
 - https://github.com/boostorg/thread/commit/395e3d786bc1dce9c60eb84da85f5845a2c1fb3d
- Bug fixes
 - #6787 boost::thread::sleep() hangs if system time is rolled back
 - #12519 boost::thread::try_join_for does not return after timeout
 - #12874 future<> extension constructor must be under BOOST_THREAD_PROVIDES_FUTURE_UNWRAP
 - #12888 Linking with boost thread does not work on mingw/gcc 4.4
 - #12958 sync_bounded_queue::wait_pull_front( lve ) might throw
 - #13077 Linking to static 64bit libboost_thread fails DLL initialization
 - #13155 log doesn't build on a system with pthreads
 - #121 on_tls_prepare is broken under VS2017
TypeIndex:
- Include <boost/functional/hash.hpp> if required, thanks to Ed Catmur #13009.
- Use native hash_code() when possible on GCC-like compilers #13027.
- Fix ctti_type_index for GCC 7 and later, thanks to Benjamin Buch PR16.
Typeof:
- Fix compilation error with clang-cl ticket 11821.
Unordered:
- Use the same data structure for unordered_set and unordered_multiset, and forunordered_map and unordered_multimap. This is required for C++17, so that nodes can be merged and extracted between compatible containers.
- Add deprecated attributes to long deprecated functions.
- Improved use of allocator_traits construct and destroy on C++11 compilers, using piecewise pair construction when appropriate.
- Fewer workarounds on newer Oracle compilers.
- Avoid dereferencing pointers to uninitialized memory (PR #5).
Utility:
- Improved compatibility of boost::next/boost::prior with SFINAE-unfriendly iterators. #10847, #13002.
Variant:
- r-value overload for boost::get was added by Albert Sverdlov #13018.
- Missing include fro <boost/variant/polymorphic_get.hpp> header was added by Adam Badura #13037.
- boost::make_variant_over was fixed and now works with views and other Forward Sequences (thanks to Mikhail Maksimov for the fix) #8554, #10041, PR#35.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.8.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.8.1, 3.9.1, 4.0.1
- Clang, C++1z: 4.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.4.0, 7.1.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.4, 5.4.0, 7.1.0
- GCC, C++14: 5.4.0, 5.4.1, 6.3.0, 7.1.0
- GCC, C++17: 7.1.0
- GCC, C++1z: 6.3.0
- Intel: 16.0, 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0
OS X:
- Clang: 8.1.0
- Clang, C++11: 8.1.0
- Clang, C++14: 8.1.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++11: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4
- GCC, C++14: 6.2
FreeBSD:
- Clang: 3.8.0
- Clang, C++11: 3.8.0
- Clang, C++14: 3.8.0
- Clang, C++1z: 3.8.0
QNX:
- QCC, C++11: 4.7.3
SunOS:
- Oracle Solaris Studio: 12.5_next, 12.5
- Oracle Solaris Studio, C++11: 12.5_next, 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.1
- Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.8.1, 3.9.1, 4.0.1
- Clang, C++1z: 4.0.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.4.0, 7.1.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.4, 5.4.0, 7.1.0
- GCC, C++14: 5.4.1, 6.2.0, 6.3.0, 7.1.0, 8.0.0
- GCC, C++17: 7.1.0
- GCC, C++1z: 6.3.0
- Intel: 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0
OS X:
- Clang: 8.1.0
- Clang, C++11: 8.1.0
- Clang, C++14: 8.1.0
- Clang, C++1z: 8.1.0
Windows:
- GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
- GCC, C++11: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4
- GCC, C++14: 6.2
FreeBSD:
- Clang: 3.8.0
- Clang, C++11: 3.8.0
- Clang, C++14: 3.8.0
- Clang, C++1z: 3.8.0
SunOS:
- Oracle Solaris Studio: 12.5_next, 12.5
- Oracle Solaris Studio, C++11: 12.5_next, 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.64.0

Wed, 19 Apr 2017 17:42:32 +0000

New Libraries

Process: Process library by Klemens D. Morgenstern, that provides cross platorm ways to allows you to:
- create child processes
- setup streams for child processes
- communicate with child processes through streams (synchronously or asynchronously)
- wait for processes to exit (synchronously or asynchronously)
- terminate processes
Broken feature:
- GitHub #67: "group.wait() does not return".

Updated Libraries

Any:
- Suppressed false warnings about returning reference to temporary
- boost::addressof is now used instead of directly taking the address #12615
- Headers are not included using double quotes any more #12053
- CI tests now run with address, leak, and undefined sanitizers
- Added more test
Atomic:
- Fixed possible incorrect code generation in 64-bit atomic operations on 32-bit x86 with gcc versions older than 4.7 and compatible compilers.
Config:
- Added BOOST_NO_CXX11_SFINAE_EXPR defect detection.
Container:
- Fixed bugs:
Context:
- new API: call/cc
- deprecated API:execution-context
- stack manipulation on MIPS fixed
- #12719 segmentation fault when built with mingw-w64
- #12948 Unexpected snprintf result is on Android ARM
- #38: context_entry() crashes on macOS
- #39: Unknown directive .cpu on aarch64 with Clang 3.8 on Android
- #41: std::bind() fails with invoke()
- #46: "rename of continuation member functions" missed a spot
- #50: bad assembly for fcontext on ppc64/sysv/elf
Conversion:
- Docs were ported to Quickbook (thanks to Mikhail Maksimov for the port)
- Fixed a memory leak in test (thanks to Mikhail Maksimov for the fix)
- CI tests now run with address, leak, and undefined sanitizers
Core:
- Implemented constexpr addressof on compilers that support C++11 constexpr and SFINAE expressions (Glen Fernandes). BOOST_CORE_NO_CONSTEXPR_ADDRESSOF macro indicates when constexpr addressof is not available.
- In lightweight_test.hpp, added new macros BOOST_TEST_ALL_EQ and BOOST_TEST_ALL_WITH for testing container contents (Bjorn Reese).
Coroutine2:
- #4: coroutine2<> does not accept std::bind
DLL:
- Fixed WinCE compilation
- Added boost:dll::symbol_location_ptr function for getting location of a symbol by pointer that could not be dereferenced (void pointer for example)
- Fixed UB in detail::aggressive_ptr_cast for member pointers
- Fixed leaks in experimental smart imports
- Fixed warnings
- CI tests now run with address and leak sanitizers
Fiber:
- (un)bounded_channel<> removed
- #100: ASIO: unbuffered_channel / scheduler notify issue
- #105: skynet variants crash on windows
- #106: Passing a fixed_stack allocator to async/packaged_task doesn't compile
- #110: Compile error on ARMv6
- #111: endless-loop in buffered_channel::try_value_pop()
- #114: buffered_channel::try_pushdoes not wake fibers inpop`
Geometry:
- Improvements:
 - matrix transformation is now based on Boost.QVM instead of Boost.Ublas
- Breaking changes:
 - ublas_transformer is renamed to matrix_transformer
 - explicit modifier is added to constructors of rtree index::dynamic_* parameters
 - strategy::area::huiller replaced by strategy::area::spherical
- Solved issues:
 - 363 Missing includes in geometry/index/parameters.hpp
 - 364 within(Linear, Areal) compilation error when arguments use different point types
 - 370 Buffer Seg Faults with Ring as Input
- Solved tickets:
 - 11899 boost::geometry::equals doesn't handle open polygons
 - 11930 Inaccuracy of area::huiller strategy
 - 11931 Wrong spherical area with pole encircling polygons
 - 12410 Lack of support of geographic coordinate system in correct()
 - 12566 Ambiguous template instantiation in equal_to<> when pair value contains raw pointer
 - 12861 Segmentation fault in stdlibc++ (gcc 4.8.2) affecting rtree
 - 12885 Use BOOST_THROW_EXCEPTION instead of throw
- Bugfixes:
 - Fix distance_measure in get_turn_info
Hash:
- Stop using std::unary_function and std::binary_function when they're not available.
Interprocess:
- Fixed bugs:
- New experimental option BOOST_INTERPROCESS_BOOTSTAMP_IS_SESSION_MANAGER_BASED from Windows systems. This option derives the unique bootstamp used to name the folder where shared memory is placed from registry values associated with the session manager. This option only works on Vista and later systems and might be more stable than the default version.
Intrusive:
- Fixed bugs:
  - Boost Trac #12745: key_nodeptr_comp broken if the key type is void*
  - Boost Trac #12761: intrusive::set::swap doesn't swap the comparison function*
LexicalCast:
- Fixed multiple warnings #11842
- CI tests now run with address, leak, and undefined sanitizers
Math:
- Big push to ensure all functions in also in C99 are compatible with Annex F.
- Improved accuracy of the Bessel functions I0, I1, K0 and K1, see 12066.
Multi-index Containers:
- Fixed a bug related to ambiguous references in the presence of more than one ranked index (ticket #12955).
- Maintenance fixes.
Multiprecision:
- In cpp_bin_float prevent double rounding when converting to a denormalized float. See #12527.
- Fix bug in integer sqrt for very small integers. See #12559.
- Fix conversion to signed-zero in cpp_bin_float.
- Change cpp_bin_float rounding code to round at arbitrary location so we can use it for conversions, see #12527.
- Improve performance of 128-bit bit-scan operations.
- Fix subtraction of very small quantities in cpp_bin_float. See: #12580.
- Bring error handling into line with C99 Annex F. See #12581.
- Fix bitwise export of trivial cpp_int's, see #12627.
- Fix ilogb (and code that uses it) to consistently return the smallest value of the exponent type when the argument is zero, see #12625.
- Allow conversion from __float128 to cpp_bin_float.
- Fix bug in left shift of cpp_int which would result in bit-loss, see #12790.
- Fixed bugs in bounded but variable precision cpp_int's caused by over-aggressive constexpr optimization, see #12798.
Predef:
- Fix Intel C/C++ compiler version specification.
- Add BOOST_VERSION_NUMBER_MAJOR, BOOST_VERSION_NUMBER_MINOR, BOOST_VERSION_NUMBER_PATCH macros to extract components from valid version numbers.
- Change VS version numbering. Versions after VS2015 will use the compiler version instead of the varied product versions.
Regex:
- Compiling with Oracle C++ toolset is no longer restricted to static linking.
- Big effort to de-fuzz the library using libFuzzer and fix identified issues, see: #12818.
Smart Pointers:
- Rewrite of allocate_shared and make_shared for arrays for a more optimal and more maintainable implementation (Glen Fernandes)
- Pointer cast functions with move semantics (Chris Glover)
Test:
- Boost.test v3.5 see the Change log section for more details.
- New feature:
  - Now Boost.Test provides customization points for logging user defined types
  - JUnit output format can now have a log-level
  - JUnit output format has not better performances when the test modules have a lot of checks
- Bug fixes
  - Trac tickets #11756, #12540, #12712, #12748, #12778
  - Pull request PR107, PR108
TypeIndex:
- Added BOOST_TYPE_INDEX_IMPLEMENT_RUNTIME_CAST, which implements the functionality for runtime_cast but does not include the BOOST_TYPE_INDEX_REGISTER_CLASS macro (thanks to Chris Glover for imlpementing it)
- Fixed undefined macro warning in stl_type_index.hpp #12739
- CI tests now run with address, leak, and undefined sanitizers
TypeTraits:
- Added new traits make_void and void_t.
Unordered:
- Initial support for new C++17 member functions: insert_or_assign and try_emplace in unordered_map, merge and extract in all containers.
Variant:
- Fixed construction of variant from recursive_variant_ (thanks to Mikhail Maksimov for the fix) #12508, #12645
- Do not enable variadic templates for MSVC2015Update1 as it still has issues #12236
- Workaround GCC6 crash (thanks to Mikhail Maksimov for the workaround) #12680, #7120
- Made boost::polymorphic_*get to work as boost::*get in undocumented border cases and fixed tests #11950
- CI tests now run with address, leak, and undefined sanitizers

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.1, 3.9.1
- Clang, C++14: 3.5, 3.6, 3.7.1, 3.8.1, 3.9.1
- Clang, C++1z: 3.9.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 6.2.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.4, 6.2.0
- GCC, C++14: 5.4.1, 6.2.0, 6.3.0
- GCC, C++1z: 6.2.0
- Intel: 16.0, 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0, 17.0
OS X:
- Apple Clang: 7.0.2
- Apple Clang, C++11: 7.0.2
Windows:
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.2
FreeBSD:
- Clang: 3.8
- Clang, C++11: 3.8
- Clang, C++14: 3.8
- Clang, C++1z: 3.8
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1, 3.9.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.8.1, 3.9.1
- Clang, C++14: 3.4, 3.5, 3.6, 3.7. 3.8, 3.8.1, 3.9.1
- Clang, C++1z: 3.9.1, 4.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 6.2.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.4, 6.2.0
- GCC, C++14: 5.4.1, 6.2.0, 6.3.0, 7.0.1
- GCC, C++1z: 6.2.0
- Intel: 16.0, 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0, 17.0
OS X:
- Apple Clang: 7.0.2
Windows:
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.2
FreeBSD:
- Clang, C++98: 3.8
- Clang, C++11: 3.8
- Clang, C++14: 3.8
- Clang, C++1z: 3.8
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.63.0

Mon, 26 Dec 2016 23:43:57 +0000

Post-release Patches

Atomic:
- Using 64-bit atomic operations on 32-bit x86 with gcc versions older than 4.7 and compatible compilers can result in generation of incorrect code. This problem is fixed in this commit.

Updated Libraries

Atomic:
- Added the static constant atomic<T>::is_always_lock_free for conformance with C++17. The constant indicates that the given specialization always provides lock-free implementation of atomic operations.
- Improved support of Oracle Studio on x86 targets.
Container:
- Fixed bugs:
Context:
- #11687 Xcode (Apple clang) and thread_local
- #12114 context does not preserve fpu context on ios arm64 devices (fixed for other architecturs too)
- #12411 fpu registers not preserved with O2 optimizations in Visual Studio (fixed for other architecturs too)
- #12551 building boost on arm64 causes error: unknown directive
- reduced signatur for ontop-functions
- unit-test for private fcontext-API
- performance-test for ucontext and fcontext fixed
Fiber:
- unbounded_channel and bounded_channel marked as deprecated
- new classes buffered_channel and unbuffered_channel
- performance improved
Fusion:
- Fixed fusion::vector buggy constructors (Thanks to Lee Clagett).
- BOOST_FUSION_ADAPT* and BOOST_FUSION_DEFINE* now allow empty structures. (#6592)
- BOOST_FUSION_DEFINE* allows move constructor and assignment. (#10099)
- Adaptor for std::array (Thanks to Mateusz Łoskot). (#8241)
- Fixed returning temporary variable warnings on MSVC.
Geometry:
- Improvements:
  - Intersection: take care that output is valid (work in progres, not yet finished - but more is valid)
- Solved tickets:
  - #12289 Avoid warning/compilation error for std::cout
  - #12412 Invalid result of covered_by() with geographic Points and Boxes
  - #12413 rtree::remove() not working properly with geographic Points
Hash:
- Fixed some warnings.
Interprocess:
- Fixed bugs:
Intrusive:
- Fixed bugs:
  - Boost Trac #12556: member_value_traits.hpp has a missing #include
Lexical Cast:
- Fixed issue found by -fsanitize=undefined #21
Log:
- General changes:
  - Removed the previously deprecated type_info_wrapper.
- New features:
  - Added a way to access the current file name from the text file sink backend. The file name can be obtained with the get_current_file_name method.
- Bug fixes:
  - Fixed compilation errors for Android API prior to version 21.
  - Streaming operators now take scalar types and enums by value. This allows to output static constants and bitfields directly into formatting stream and record stream. (#11998)
  - Fixed auto-detection of native syslog API. (#12600)
  - In UDP socket based syslog backend implementation, changed the syslog message format for better compliance with RFC3164.
  - File close handler installed in text file sink backend is no longer called if the file is not open yet.
- See changelog for more details.
Metaparse:
- Improved the implementation of BOOST_METAPARSE_STRING
  - The maximal string length limit has been increased to 2048
  - The maximal string length limit can be extended beyond 2048 by regenerating some of the Boost headers using a script (part of the library)
  - The string length limit can be changed within a compilation unit
Move:
- Improved experimental adaptive sort algorithm performance
- Activate BOOST_MOVE_FORCEINLINE
Optional:
- Added two new in-place constructors. They work similarly to emplace() functions: they initialize the contained value by perfect-forwarding the obtained arguments. One constructor always initializes the contained value, the other based on a boolean condition.
- Syntax o = {} now correctly un-initializes an optional, just like in std::optional.
- Fixed optional<optional<T>&> initialization. (#12203)
- Optional constructors are sfinae-friendly. This fixes interaction with std::tuple. (#12563)
Phoenix:
- Most of modules now support C++11 variadic templates.
- Fixed type deduction failure with result type.
- Suppress unused warnings.
- Fixed too few arguments error on binary math functions.
- Added workarounds for older compiler.
Python:
- Added (basic) support for C++11 (std::shared_ptr, std::unique_ptr)
- Incorporated an extension API to wrap NumPy
- Removed obsolete bits and pieces
Test:
- Boost.test v3.4 see the Change log section for more details.
- New feature: per_element and lexicographic modifiers of BOOST_TEST can also be applied to string comparison
- Breaking change: colons that appear in test case names are replaced with underscores
- Bug fixes
  - Trac tickets #11756, #11907, #12339, #12506, #12507, #12530,
  - Trac tickets #12531
  - Pull request PR103, PR104
TypeIndex:
- Added runtime_cast to the library as an emulation of dynamic_cast. Thanks to Chris Glover for the implementation. See runtime_cast reference for more info.
- Internals of the CTTI were made more platform independant, due to change of the std::size_t type to unsigned int.
Units:
- Fix inspection warnings
- updated physico-chemical constants to CODATA 2014 values
- define biot correctly as 10 Ampere
Unordered:
- Fix an exception safety issue in assignment.
- Use std::allocator_traits where available, and support modern style rebind (#12459).
- Add some allocator aware constructors.
- Use the hint iterator in emplace_hint.
- Fixed some warnings.
- See the changelog for more details.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.8.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.1
- Clang, C++14: 3.5, 3.6, 3.7, 3.8.1
- Clang, C++1z: 3.8.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.2.0, 6.2.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.3, 5.2.0, 6.1.1, 6.2.0
- GCC, C++14: 5.2.0, 5.3.0, 6.1.1, 6.2.0
- Intel: 16.0, 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0, 17.0
OS X:
- Apple Clang: 7.0.2
- Apple Clang, C++11: 7.0.2
Windows:
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.2
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8.1
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.1
- Clang, C++14: 3.5, 3.6, 3.7, 3.8.1
- Clang, C++1z: 3.8.1
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.2.0, 6.1.1, 6.2.0
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.3, 5.2.0, 6.1.1, 6.2.0
- GCC, C++14: 5.2.0, 5.3.0, 6.1.1, 6.2.0, 7.0.0 (experimental)
- GCC, C++1z: 6.1.1
- Intel: 16.0, 17.0
- Intel, C++11: 16.0, 17.0
- Intel, C++14: 16.0, 17.0
OS X:
- Apple Clang: 7.0.2
- Apple Clang, C++11: 7.0.2
Windows:
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.2
- GCC,C++14: 6.1.0
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.62.0

Wed, 28 Sep 2016 10:17:52 -0500

New Libraries

Fiber: Framework for userland-threads/fibers, from Oliver Kowalke.
QVM: Boost QVM is a generic library for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications, from Emil Dotchevski.

Updated Libraries

Atomic:
- Improved support for Oracle Studio and SPARC. The library now provides native atomic operations on SPARCv8+.
Chrono:
- #11330 boost::chrono::duration default constructor doesn't initialize rep_
- #11618 Chrono IO V2 doc ios_state.hpp does not exist
- #11631 boost chrono io v2 does not let you support custom clocks
Circular Buffer:
- Debug implementation is no longer used by default in debug mode. Debug implementation does not have the same thread safety guarantees as the normal (release) implementation or other containers. As a result of this change BOOST_CB_DISABLE_DEBUG macro is no longer used. BOOST_CB_ENABLE_DEBUG=1 should be defined instead to enable debug support. (#6277)
Container:
- Fixed bugs:
- Revised noexcept expressions of default and move constructors in all containers.
- Implemented C++17 insert_or_assign/try_emplace for map and flat_map.
- Implemented C++17 extract/insert(node) for map, multimap, set, multiset.
Context:
- #12215 all stack corrupted on Windows using default fixedsize_stack
- #12242 build issue with Intel C++ compiler for MacOS
- fix stack unwinding for execution_context_v1
Coroutine:
- deprecated in favour of Coroutine2
Coroutine2:
- #12221 coroutine<>::push_type function starts without pushing
- do not swallow exceptions thrown at coroutine<>::push_type construction
DLL:
- Mangled symbols and classes loading was implemented by Klemens Morgenstern
- Suppress a 'unused parameter' warning in detail::aggressive_ptr_cast pull-request 9
- Allowed to query non-existant sections pull-request 32
- More tests and docs
Functional/Forward:
- Fix C++11 compile error.
Geometry:
- Improvements:
  - Union: take care that output is valid (with some exceptions), also with self-tangent polygons or shared edges
  - SVG: support boost::variant of geometries
  - SVG: coordinates are now written as double (by default) to svg
  - Rename namespace concept to concepts to avoid conflicts with the newest compilers
  - New spherical intersection strategy used in relational and set operations for spherical and geographic Geometries (previously cartesian intersection strategy was used for all coordinate systems).
- Solved tickets:
  - #12189 Relational operations not compiling when point types of inputs are different
  - #12287 Invalid result of rtree.query() for contains() predicate
Interprocess:
- Fixed bug GitHub Pull #27 ("Fix undefined behavior").
Intrusive:
- Fixed bugs:
Lexical Cast:
- Fix incorrect static assertion #11759
Log:
- New features:
  - Added new tools for inter-process logging on a local machine. The implementation includes a resource name wrapper, an inter-process message queue and a sink backend.
  - Added a new character decorator called max_size_decor. The new decorator allows to limit the output of its adopted formatter up to the specified length.
- Bug fixes:
  - Fixed that logging streams could retain formatting settings across different log records. (#12178)
- See changelog for more details.
Math:
- New Features:
  - Enabled all the special function code to work correctly with types whose precision can change at runtime: for example type mpfr_float from Boost.Multiprecision.
- Patches:
  - Fix tgamma_delta_ratio for cases where the delta is small compared to the base.
  - Fix misc GCC-4.4 test failures.
Optional:
- Fixed Trac #12179.
Phoenix:
- Fix compilation for MSVC 10. pull-request 18
- Remove unused preprocessed files. pull-request 28
- Fix erroneous doc for switch_ statement. #8156
- Cleanup config unordered. pull-request 33
- Suppress unused placeholder warnings.
- Fix too few arguments error on binary math functions.
Regex:
- Fix buffer over-run error when parsing certain invalid regexes, see #12222.
- Fix detection of ICU in library build, see #12152.
- Fix bug in case sensitivity change, see #11940.
- Allow types wider than int in \x{} expressions (for char32_t etc), see #11988.
Test:
- Boost.test v3.3 see the Change log section for more details.
- New features
  - dataset driven test-cases have now a unique name and all sample tests of a dataset live inside the same test suite
  - Boost.test learned a new command line switch, --logger for setting a test logger as well as its parameter in one command
  - Boost.test learned to have several loggers at the same time, each of which having their own log level and output stream
  - Boost.test learned a new logger, JUNIT, that is able to output Junit/xUnit compatible streams
  - It is now possible to specify several test filters through the environment variable BOOST_TEST_RUN_FILTERS
- Bug fixes
  - Trac tickets #8707, #8834, #11128, #11845, #11859, #12024,
  - Trac tickets #12093, #12103, #12224, #12241, #12257, #12378
  - Pull request PR81
Thread:
- #12102 condition_variable_fwd.hpp fails to compile when BOOST_THREAD_PROVIDES_INTERRUPTIONS is disabled
- #12120 Performance improvement in thread/barrier.hpp
- #12146 make_exceptional_future is not mentioned in the docs
- #12202 shared_lock should be in shared_mutex header
- #12371 boost thread/future.hpp fails to build
- #88 fix typos in boost::upgrade_lock
- #89 fix a bug in upgrade_to_unique_lock<>::operator=()
- #90 fix a bug in try_lock_wrapper<>::operator=()
- #91 Add shared_lock_guard to the included lock types
- #92 Fixed compilation with MSVC-8.
- #93 Fix variable shadowing warnings (Clang)
- #94 fix bugs in boost::barrier
- #95 fix a mistake in boost::completion_latch
- #96 rename async_func.hpp to invoker.hpp.
- #97 fix a mistake in sync_timed_queue<>::pull_until()
TypeIndex:
- ctti_type_index was made constexpr in C++14. Now it is possible to retrieve actual name of the type as const char* at compile time. So we can do a lot of interesting things at compile time: check namespace of a type, sort types according to their lexical representation, check that type is a template type and so on... A few examples were provided.
- Fixed issue with noexcept on MSVC in type names and issue with space in type name (pulled from klemens-morgenstern/develop)
- Fixed typos pull-request 7
- Improved CI testing
Unordered:
- Remove use of deprecated boost::iterator.
- Fixed an exception safety issue in assignment of unordered_multiset and unordered_multimap.
- See the changelog for more details.
Variant:
- Fixed variant construction from classes derived from variant #7120, #10278, #12155
- Variant constructors and assignment operators now do not participate in overload resolutions if variant can not hold the input type #5871, #11602
- Fixed the issue with implicit conversion operator in C++11 #8555
- Fixed comparisons when variant holds non-const reference #11751
- Fixed noexcept for variant's move-assignment #11696
- Fixed double quotes in includes #12057
- Dropped BOOST_VARIANT_NO_REFERENCE_SUPPORT macro and dropped support for compilers without SFINAE #12250
- Suppress implicit instantiation of MPL end iterator
- Multiple minor fixes (typos, missing includes)

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.8.0
- Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8.0
- Clang, C++14: 3.5, 3.6, 3.7, 3.8.0, 3.8.1, 3.9.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 5.2.0, 6.1.1
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.3, 5.2.0, 6.1.1
- GCC, C++14: 5.2.0, 5.3.0, 5.4.1, 6.1.1
- Intel: 16.0
- Intel, C++11: 16.0
- Intel, C++14: 16.0
Windows:
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 6.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.1
FreeBSD:
- Clang: 3.4.1, 3.7
- GCC: 4.8.5, 5.4.0, 6.1.1
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.8
- Clang, c++11: 3.0, 3.1, 3.2, 3.3, 3.4, 3.8
- Clang, c++14: 3.5, 3.6, 3.7, 3.8, 3.9
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.2, 4.8.4, 5.2.0, 6.1.1
- GCC, C++11: 4.4.7, 4.7.2, 4.7.3, 4.8.5, 4.9.3, 5.2.0, 6.1.1
- GCC, C++14: 5.2.0, 5.3.0, 5.4.1, 6.1.1, 7.0.0 (experimental)
- Intel: 16.0
- Intel, C++11: 16.0
- Intel, C++14: 16.0
OS X:
- Apple Clang: 7.3.0
- G++: 6.1.0
Windows:
- Clang: 3.8.1
- GCC, C++03, mingw: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0, 5.2.0, 5.3.0, 6.1.0
- GCC, cygwin: 5.4.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7, 3.8
- GCC: 4.9, 5.4, 6.1
FreeBSD:
- Clang, C++11: 3.4.1, 3.7.0
- GCC, C++11: 4.8.5. 5.4.0, 6.1.1
Haiku:
- GCC, C++11: 5.4.0
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.5
- Oracle Solaris Studio, C++11: 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.61.0

Thu, 12 May 2016 21:58:28 -0500

New Libraries

Compute: Parallel/GPU-computing library
DLL: Library for comfortable work with DLL and DSO. Library provides a portable across platforms way to:
- load libraries
- import any native functions and variables
- make alias names for C++ mangled functions and symbols
- query libraries for sections and exported symbols
- self loading and self querying
- getting program and module location by exported symbol
Hana: A modern C++ metaprogramming library. It provides high level algorithms to manipulate heterogeneous sequences, allows writing type-level computations with a natural syntax, provides tools to introspect user-defined types and much more.
Metaparse: A library for generating compile time parsers parsing embedded DSL code as part of the C++ compilation process. The library is similar to Spirit, however while parsers built with Spirit parse at run-time, parsers built with Metaparse parse at compile-time.

Updated Libraries

Any:
- More tests and maintainance fixes.
Container:
- small_vector supports more constructors and assignments.
- Fixed bugs:
Context:
- #11246 fails to build for mingw because of undefined symbols
- #11365 execution_context.hpp gives errors when building with VS2015RC
- #11652 checking __cpp_lib_integer_sequence
- #11946 crashes on x86_64/MinGW
- fcontext_t: no longer part of public API
- support for WinFiber API removed
- execution_context: relaxed to C++11
- execution_context: type-safe transfer of data
- execution_context: execute function on top of stack
- execution_context: improved performance
- execution_context: static member-fn current() removed
- execution_context: new call semantic
Coroutine:
- attribute related to FPU-env removed
Coroutine2:
- attribute related to FPU-env removed
- improved performance
- relaxed to C++11
Fusion:
- Mitigate massive warnings about use of BOOST_PP_IS_EMPTY on MSVC8. #11157
- Container's conversion ctor and SFINAE. #11766
- Drop trailing fusion::void_ support from C++11 fusion::vector. pull-request 120
- Workarounds for GCC 4.0 and 4.1 ICE. #5808 #7229
- Workaround for ambiguous call of fusion::convert on GCC 3.4. pull-request 130
Geometry:
- Additional functionality:
  - Support within and covered_by for Box/Box in spherical and geographic coordinate systems.
- Improvements:
  - Overlay: handle_tangencies replaced by clusters, fixing many cases with colocated turns
- Solved tickets:
  - #9162 Invalid result of relational operations for non-cartesian Point/Areal.
  - #10866 union_ doesn't work in 1.56 and 1.57.
  - #11018 Invalid geometry intersection
  - #11576 Intersection gives wrong results.
  - #11637 Unused parameter warning.
  - #11725 union_ fails to create holes
  - #11789 Assertion failure or invalid result of set operations for spherical_equatorial coordinate system.
  - #11917 Andoyer distance strategy returns 0 for antipodal points (default geographic distance).
  - #11928 Improvement of the accuracy of surveyor area strategy.
  - #11966 Compilation error in svg() for box and non-int coordinate type.
  - #11984 union_() generates self-intersecting polygon
  - #11987 rtree::remove() not compiling for geographic CS.
  - #12000 Uninitialized reference in (unused) constructor of relate's mask_handler.
  - #12106 Invalid assertion failure in envelope() for non-cartesian very short segments.
- Bugfixes:
  - Fix intersects and disjoint for Segment/Box in cartesian coordinate system when Segment is parallel to Box's face.
  - Fix relation operations for Point/Areal in spherical and geographic coordinate systems for edge cases.
  - Fix intersects and disjoint for Point/Box and Box/Box in spherical and geographic coordinate systems for some cases.
  - Fix within and covered_by for Point/Box in spherical and geographic coordinate systems for some cases.
Interprocess:
- Fixed bugs:
  - GitHub Pull #23 ("Fixed case sensetive for linux mingw").
Intrusive:
- Fixed bugs:
Lexical Cast:
- Fixed Sun Studio related issues
Log:
- General changes:
  - The support for boost::basic_string_ref and its specializations is deprecated; users are encouraged to switch to boost::basic_string_view. The support for boost::basic_string_ref will be removed in future releases.
  - Added support for limiting the number of stored log files in the target directory of the file collector. Thanks to Erich Keane for the patch. (#8746)
- Bug fixes:
  - Fixed various compilation problems for Windows CE.
  - Fixed compilation problems on Solaris.
  - Added a workaround for MSVC-10 generating broken code for formatters in some cases. (#12025)
- See changelog for more details.
Math:
- Polynomial arithmetic added to tools.
Move:
- Experimental: asymptotically optimal bufferless merge and sort algorithms: adaptive_merge and adaptive_sort.
- Fixed bug:
  - Trac #11758: "BOOST_MOVABLE_BUT_NOT_COPYABLE doesn't reset private access with rvalue ref version".
Multiprecision:
- Fixed bug in stream input for integer types, see #11857.
- Fixed some ambiguous conversions involving expression templates see #11922.
- Add expression template aware min/max overloads see #11149.
- Fix bug in right shifting negative small integers in cpp_int see #11999.
- Use memmove for bitshifts in cpp_int when possible see #9233.
- Use memcpy for data import into cpp_int where possible, see #9235.
- Changed cpp_bin_float.convert_to<double>() to a function template rather than proceding via long double to avoid double-rounding bug, see #12039.
- Fixed conversions from NaN's and Infinities, see #12112.
- Enabled better support for Clang on Windows.
- Fixed handling of NaN's and Infinities in basic arithmetic for cpp_dec_float and cpp_bin_float, see #12090.
- Fixed fencepost error in cpp_bin_float subtraction.
- Fixed double-rounding in conversion to float routines for cpp_bin_float, see #12039.
- Make float128 denorm aware, see #12075.
- Allow the library and tests to be used without exception handling support, see #12070.
- Fixed buggy comparison operator overloads for boost::rational.
- Added some workarounds for Oracle C++.
- Fixed some missing typecasts for cases where cpp_int's limb_type is wider than unsigned.
Optional:
- Now boost::optional is specialized for reference parameters. This addresses a couple of issues:
 - the sizeof of optional reference is that of a pointer,
 - some bugs connected to copying optional references are gone,
 - all run-time bugs caused by incorrect reference binding on some compilers are now turned into compile-time errors,
 - you can swap optional references: it is like swapping pointers: shalow, underlying objects are not affected,
 - optional references to abstract types work.
- Documented nested typedefs (Trac #5193).
- Made the perfect-forwarding constructor SFINAE-friendly, which fixes Trac #12002. However, this only works in the newer platforms that correctly implement C++11 <type_traits>.
- Fixed Trac #10445.
Regex:
- Change to lockfree implementation of memory cache, see PR#23.
Test:
- Boost.test v3.2 see the 'Change log' section for details.
- New features
  - dataset driven test-cases learned to support fixtures and variadic number of arguments
  - dataset driven test-cases sample types now honor move semantics
- Bug fixes
  - #6767, #8905, #9443, #11854
  - #11887, #11889, #11983
Variant:
- Maintainance fixes.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7.1
- Clang, C++14: 3.7.1, 3.8.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.3, 4.8.4, 4.8.5, 4.9.3, 5.3.0
- GCC, C++11: 4.4.7
- GCC, C++14: 5.2.1, 5.3.1
- Intel: 16.0
Windows:
- GCC, C++03, mingw: 3.4.5
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1, 5.2
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7
- GCC: 4.9, 5.3
FreeBSD:
- Clang: 3.4.1, 3.7
- GCC: 4.8.5, 5.3
Haiku:
- GCC, C++11: 4.8.5
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.4, 12.5
- Oracle Solaris Studio, C++11: 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7.1
- Clang, c++14: 3.7.1, 3.8.0
- GCC: 4.4.7, 4.5.3, 4.6.3, 4.7.3, 4.8.5, 4.9.3, 5.3.0, 5.3.1, 6.0.0
- GCC, C++11: 4.4.7
- GCC, C++14: 5.2.1
- Intel: 16.0
OS X:
- Apple Clang: 7.0.2
- G++: 5.3.0
Windows:
- GCC, C++03, mingw: 3.4.5
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1, 5.2
- GCC, cygwin: 5.3.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7
- GCC: 4.9, 5.3, 6.0
FreeBSD:
- Clang: 3.41, 3.7.0
- GCC, C++11: 4.8.5, 5.3.0, 6.0
- GCC: 6.0
Haiku:
- GCC, C++11: 4.8.5
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.4, 12.5
- Oracle Solaris Studio, C++11: 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.60.0

Thu, 17 Dec 2015 07:52:06 -0800

New Libraries

VMD: Variadic Macro Data library, from Edward Diener.

Updated Libraries

Atomic:
- Enforced proper alignment of atomic<> storage. This should fix possible issues on platforms that support atomic operations on data units larger than the native word size. This may also change binary layout of user's data structures that have atomic<> members.
- Fixed compilation for PowerPC with IBM XL C++ compiler. Corrected memory barriers in PowerPC assembler.
- Fixed compilation with MSVC-8 for ARM.
- Fixed compilation with gcc 4.4 for x86-64, when 128-bit atomic operations were used. (#10994)
- Optimized some gcc assembler blocks for x86/x86-64 to reduce the number of used registers. This may require binutils 2.10 or later.
Chrono - 2.0.5:
- Fixes:
 - #10778 VC14 CTP4 Atomic don't compile with boost::chrono durations which are not TriviallyCopyable
 - #10840 Missing std:: qualifier for puts call in test_7868.cpp
 - #10851 Missing std:: qualifier for puts call in time_point_output.cpp
 - #10893 Minor doc typo in Boost.Chrono
 - #10992 Chrono IO state savers inconsistent with Boost.IO state savers
 - #10995 duration_put::put_value truncates fractional part
 - #11006 Impossible to instantiate time_fmt_io_saver due to several errors.
 - #11012 chrono_io v2 fail to compile with boost::chrono::duration< boost::rational<int> >
Container:
- Implemented Polymorphic Memory Resources.
- Add more BOOST_ASSERT checks to test preconditions in some operations (like pop_back, pop_front, back, front, etc.)
- Added C++11 back/front operations to basic_string.
- Fixed bugs:
Context:
- #11603 typo in PPC32/MACH-O asm
- support for CYGWIN
Core:
- In symbol demangling tools, added support for gabi++ ABI implementation used in Android NDK.
- Added a new enable_if_has_type tool for performing SFINAE checks for presence of a nested type.
Filesystem:
- New Features:
  - Added functions lexically_normal, lexically_relative, relative, and weakly_canonical. Many thanks to Jamie Allsop for his help and perseverance. Resolves tickets #1976, #5897, #6249.
  - Class path added types reverse_iterator and const_reverse_iterator, and added functions rbegin(), and rend().
  - C++11 noexcept supplied as specified in the Filesystem TS if supported by the compiler.
  - C++11 move constructors and move assignments supplied as specified in the Filesystem TS if supported by the compiler. Resolves #10291.
  - Existing functions whose names changed in the Filesystem TS are now supported under both the old and new names.
  - Added size() function to class path. Resolves #6874, Path should have a size() member function.
- Tickets:
  - Fix #11733, Missing unistd.h include in boost/libs/filesystem/src/unique_path.cpp, by apply a patch from Idar Tollefsen.
  - Fix #5706, unique_path Fails on Windows for Temporary User Profiles, by applying pull request #15 from Sebastian Redl to fix a race condition in unique_path.
  - Fix #10591, boost::filesystem does not build on iOS 8, by applying a patch submitted by Daniel Seither.
  - Fix #9454, Boost Filesystem [library build] not compiling when BOOST_FILESYSTEM_NO_DEPRECATED is defined, by applying a patch submitted by Makesim.
  - Fix #11447, __OpenBSD__ macro name misspelled, by applying a patch submitted by Jasper Lievisse Adriaanse.
  - Fix #11288, A patch to avoid redundant string allocations, by applying a patch submitted by Yevhen Ivannikov.
  - Resolve #11175, out-of-date documentation causing users to incorrectly expect that the library could be used with exceptions disabled.
  - Resolve #11166, by mitigating (i.e. reducing the likelihood of) a possible external file system race in remove().
  - Fix #7258, create_directories returns false if the path ends with a slash. Also fix related issues if path contains dot or dot-dot elements, and added test cases to the test suite.
  - Resolve #10766, parent_path() with redundant separator returns wrong value, by adding examples and notes to the reference documentation to show why the returned value is in fact correct, and to provide rationale for that behavior. See path.itr, and path.decompose parent_path() and filename() sections of the reference docs.
  - Close #7607, path should not infer an invisible "." at the end of a path that ends with a slash, as resolved by #7258 and #10766.
  - Close #11061, #11062, Impossible to traverse the path of the reverse iterator, as effectively resolved by the addition of the class path reverse iteration feature. The reference documentation has also been updated with a note warning about the limitations of class path iterators.
- Other fixes:
  - Clear several spurious GCC warnings.
  - Fix bug in file_status and recursive_directory_iterator: C++ turns an explicit constructor with all arguments except first defaulted into non-explicit single argument constructor.
  - Apply Reference docs editorial cleanups: Use same style sheet as the rest of the documentation. Tweak tab font size. Fix excessively long lines in tables, synopsis.
  - Minor fixes, including pull requests from Jonathan Wakely and Marcel Raad.
Flyweight:
- Maintenance fixes.
Fusion:
- All of fusion containers and generators now support C++11 variadic templates. (pull-request 89, pull-request 97, pull-request 100)
  - Special notice for fusion::vector
    
    Due to implementation limitation, numbered form (i.e. fusion::vectorN) is provided via C++11 aliasing templates and deprecated in C++11 or later. In this case, you should check BOOST_FUSION_HAS_VARIADIC_VECTOR macro and switch usage because some partial specialization would become compile error (e.g. pull-request for Spirit).
- fusion::nview now support C++11 variadic templates. (pull-request 90)
- fusion::fold is now SFINAE-friendly. (pull-request 102)
- Bug fixes:
  - The generic fusion sequence convert to a deque fails with a compiler error. (#11572)
  - (doc) Return type of functions incorrect. (#3358)
Geometry:
- Solved tickets:
  - #10803 Union algorithm returning invalid geometry
  - #11522 Namespace clash in buffer for traits::detail
  - #11533 Assert failure in rtree caused by a bug in remove() if min elements number is 1
  - #11607 Private geometry::exception::what()
  - #11709 is_simple segfault
  - #11710 is_simple - empty geometry logic
  - #11711 is_simple and is_valid - Points that are NaN or Infinity
- Bugfixes:
  - Fix colocations of touching interior ring / exterior ring, where it also touches another polygon
  - Fix removing values from an empty rtree - no effect and 0 returned instead of assertion failure
  - Fix segfault in centroid for multi geometries containing empty single geometries (thanks to Jiri Drbalek)
  - Fix liang_barsky strategy for integral coordinates (thanks to Dane Springmeyer)
Interprocess:
- Improved offset_ptr performance and removed any undefined behaviour. No special cases needed for different compilers.
- Fixed bugs:
  - Trac #11699 ("Forward declarations of std templates causes stack corruption under Visual Studio 2015").
Intrusive:
- Advanced lookup and insertions in ordered associative containers now support comparison functions that are not required to offer the same strict weak ordering as key_compare, the container must be partitioned in regards to the passed comparison object.
- Fixed bugs:
  - Boost Trac #11701: Regression in boost::intrusive::set::equal_range
  - Boost Trac #11765: sgtree.hpp:830: bad if test ?
Lexical Cast:
- Fixed usage of lexical_cast with move only types #11570
- Fixed crash when BOOST_LCAST_NO_COMPILE_TIME_PRECISION is defined #11669
- Suppress some of the warning reported in #11570 and #4946
Locale:
- Implemented generic codecvt facet and add general purpose utf8_codecvt facet
- Added posix locale support for FreeBSD 10.0 and above
- Fixed issues #10017 (sun redefinition on SunOS), #11163 (set_default_messages_domain incorrect behavior), #11673 build issues
- Some warning cleanup
- Fixed tests for latest ICU versions
- Added workaround for libc++ issues
- Added new defines BOOST_LOCALE_ENABLE_CHAR16_T and BOOST_LOCALE_ENABLE_CHAR32_T to enable C++11 char16_t and char32_t instead of deprecated ones
Log:
- General changes:
  - On Windows, the configuration macro BOOST_LOG_USE_WINNT6_API is no longer used by the library. The target Windows version should be configured by defining macro BOOST_USE_WINAPI_VERSION.
- Bug fixes:
  - Fixed compilation for Android using Google NDK. (#11559)
  - Fixed compilation of some logging statements, where the first object to be put into stream is not directly supported by formatting_ostream. (#11549)
  - Added a workaround for Solaris Studio 12.4, which should fix the compilation of formatting_ostream. (#11545)
  - Fixed compilation when native wchar_t type is disabled. (#11541)
  - Fixed exporting symbols from the boost_log_setup library on POSIX-like systems.
  - Fixed compilation of character decorators.
  - Added a workaround for incorrect file name generation in text file sink backend, when the file name contains date/time placeholders. (#11691)
- See changelog for more details.
Move:
- Fixed bug Trac #11615: "Boost.Move should use the qualified name for std::size_t in type_traits.hpp",
Multi-index Containers:
- Fixed an interoperability problem with Qt due to the optional definition of a macro with name foreach in this framework.
- Maintenance fixes.
odeint:
- New features:
  - Added functionality to throw an exception if too many ODE steps are performed.
  - Added possibility to limit maximal step size in adaptive methods.
- several Bug fixes, see https://github.com/headmyshoulder/odeint-v2/issues
Optional:
- Changed the implementation of boost::none again. Now it is a const object with internal linkage (as any other tag). This fixes #11203.
Predef:
- Add detection of SIMD hardware.
- See history for more details.
Test:
- Boost.test v3.1 see the 'Change log' section for details.
- New features
  - Improved Command Line Interface
  - Improved dataset API
- Bug fixes
  - #3384, #3897, #6032, #6859, #7257
  - #9228, #10317, #11279, #11478
  - #11571, #11623, #11624, #11625
Thread - 4.6.0: New Experimental Features:
- #11231 Allow to set continuation future's destructor behavior to non-blocking
- #11424 Provide shared_timed_mutex as an alternative name for shared_mutex and deprecate the use of shared_mutex as a timed mutex
- #11734 future::then(Cont) should be able to execute the contination on undetermined thread
- #11736 Allow to use launch::executor on future::then(launch::executor, cont)
- #11737 Add a launch::inherit policy that can be used on ::then() to use the policy of the parent future Fixed Bugs:
- #3926 thread_specific_ptr + dlopen library causes a SIGSEGV.
- #6377 Condition variable blocks when changing time
- #6787 boost::thread::sleep() hangs if system time is rolled back
- #7665 this_thread::sleep_for no longer uses steady_clock in thread
- #7720 exception lock_error while intensive locking/unlocking of mutex
- #9309 test_latch fails often on clang-darwin-tot11
- #10788 GetLogicalProcessor isn't available for Windows platform less or equals to 0x0502
- #11090 ex_future_unwrap- ThreadSanitizer: lock-order-inversion (potential deadlock)
- #11158 Pthread thread deadlock when faketime used
- #11174 boost::condition_variable::timed_wait with predicate unexpectedly wakes up while should wait infinite
- #11185 Incorrect URL redirection
- #11192 boost::future<>::then() with an executor doesn't compile when the callback returns a future
- #11250 future made from make_exceptional fails on assertion in destructor
- #11256 future<>::is_ready() == false in continuation function
- #11261 bad use of scoped threads in basic_thread_pool
- #11262 bad use of direct pointer in shared_state_nullary_task
- #11263 lock already locked lock
- #11266 boost::packaged_task has invalid variadic signature
- #11302 boost thread doesn't build with BOOST_THREAD_PATCH.
- #11322 sleep_for() nanoseconds overload will always return too early on windows
- #11329 using declarative for GetProcessHeap, .... fails
- #11368 boost thread's usage of CreateWaitableTimer wakes PC from sleep (doh)
- #11377 Boost condition variable always waits for system clock deadline
- #11435 gcc compiler warning in future.hpp
- #11555 devector.hpp assumes allocator_traits_type is always present
- #11562 Timer (using steady_clock) expires after computer time is set forward on Ubuntu 64-bit
- #11672 Thread: Should use unique_ptr, not auto_ptr
- #11688 thread::try_join_until: Avoid busy wait if system clock changes
- #11716 ::then(f) should inherit the parent Executor
UUID:
- Added a workaround for MSVC codegen bug that could cause crashes when comparing UUIDs.
- Added detection of AVX being enabled with MSVC compiler switches.

News

Notes for Windows users

This release of Boost will by default compile for Windows Vista/Windows Server 2008, if the compiler supports a recent enough Windows SDK, and for Windows XP otherwise. Binaries compiled with default options may not run on the older Windows versions.

It is still possible to explicitly specify target Windows version by defining BOOST_USE_WINAPI_VERSION to a numeric version of Windows API. For example, building Boost for Windows XP can be done with the following command:

    b2 release define=BOOST_USE_WINAPI_VERSION=0x0501

The list of Windows API version numbers can be seen on this page.

This change only concerns libraries that use the common Windows API abstraction layer. Currently, these libraries are: Boost.Chrono, Boost.Dll, Boost.Log, Boost.UUID. This will also affect all dependent libraries.

Release of Hana postponed

Due to time constraints, the release of Hana will be postponed to a later release of Boost. This will also allow some known issues to be addressed properly before releasing the library officially as a part of Boost. More information can be found on the mailing list.

Release of Boost.DLL library postponed

In order to provide superior support of uncommon toolsets and platforms, the release of Boost.DLL was postponed to a later release of Boost. This also allows to test better a recently added ability to copy construct and copy assign instances of boost::dll::shared_library and provide examples on importing functions with non default calling conventions. Latest version and developer documentation of the library could be found at GitHub repo.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.6
- Clang, C++14: 3.7
- GCC: 4.4.7, 4.8.4, 4.9.3, 5.1.0, 5.2.1
- GCC, C++11: 4.4.7
- GCC, C++14: 4.9.3
Windows:
- GCC, C++03, mingw: 3.4.5
- GCC, C++11, mingw: 4.6.4, 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7
- GCC: 4.9.0, 5.2.0
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.4, 12.5

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4.2, 3.6.0, 3.8.0
- Clang, C++14: 3.7.0
- GCC: 4.4.7, 4.5.3, 4.6.4, 4.7.3, 4.8.1, 4.9.3, 5.1.0, 6.0.0
- GCC, C++11: 4.4.7
- GCC, C++14: 4.9.3, 5.2.1
- IBM XL C++: 13.1.2.0
- Intel: 16.0
OS X:
- Clang: 7.0.0
- GCC: 5.2.0
Windows:
- GCC, C++03, mingw: 3.4.5
- GCC, C++11, mingw: 4.7.3, 4.8.1
- GCC, C++14, mingw: 4.9.3, 5.1.0
- Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6, 3.7
- GCC: 4.9.0, 5.2.0
FreeBSD:
- Clang, C++11: 3.4.1, 3.7.0
- GCC, C++11: 4.8.5, 5.2.0, 6.0.0
QNX:
- QCC: 4.4.2
SunOS:
- Oracle Solaris Studio: 12.4, 12.5

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.59.0

Thu, 13 Aug 2015 08:23:03 -0700

Known Issue

Boost.Log contains has a regression that prevents some of the logging statements from compiling (#11549). This is fixed in git.

New Libraries

Convert: An extendible and configurable type-conversion framework, from Vladimir Batov.
Coroutine2: (C++14) Coroutine library, from Oliver Kowalke.

Updated Libraries

Container:
- GitHub #26: Fix bug in stable_vector::capacity(). Thanks to timsong-cpp/Arindam Mukerjee.
- GitHub #27: fix stable_vector's index_of's doxygen comment. Thanks to kariya-mitsuru.
- Trac #11380: "Container library std forward declarations incorrect in std_fwd.hpp on libc++ with gcc".
- Trac #11388: "boost::container::list::emplace_back broken on Visual Studio 2010".
- Trac #11339: "VC12 LNK2005 error with boost::container::adaptive_pool".
Context:
- #11223 check support for std::integer_sequence
- execution_context uses internally Windows Fibers with BOOST_USE_WINFIBERS
- support of assember for MinGW on Windows (32bit)
Coroutine:
- #10978 remove additional semicolons
- #11230 coroutine_error returns dangling exception message pointer
- #11234 doesn't compile when used with boost::range::algorithms
- #11356 coroutines segfaults with BOOST_USE_SEGMENTED_STACKS
Fusion:
- Add a new concept, Unbounded Sequence for sequence and Unbounded Iterator for iterator. Currently, Unbounded Sequence affects the behaviour of fusion::(value_)at(_c) and fusion::(value_)at_key. Unbounded Iterator has no effect (reserved for future release). For more details, see Unbounded Sequence and Unbounded Iterator. (pull-request 85)
- Support C++11 variadic templates for fusion::list. (pull-request 84)
- Fixed bugs:
 - Fix missing include <utility>. (#11161)
 - Revert some constexpr support, regression in 1.58.0. (#11211, #11267)
 - Fix compile error with fold due to missing include. (#11249)
 - Fix compile error with adapting an empty struct, regression in 1.58.0. (#11269)
 - Remove use of obsolete (and incorrect) workaround for sequence comparison, it affects MSVC-8 and earlier. (pull-request 78)
 - Fix compile error while copying a sequece which derived from fusion::list, regression in 1.58.0. (pull-request 87)
 - Fix compile error on copying a fusion::tuple. (#11140)
 - Add workarounds for GCC 4.6 with constexpr. (#11517)
Geometry:
- Additional functionality:
  - Added rtree const_iterator, begin(), end() and the support for Boost.Range.
  - The support for C++11 std::initializer_list in geometries models.
  - Disjoint and intersects support the following geometry combinations: multipoint/linestring, multipoint/multilinestring.
  - Added relate() and relation() algorithms.
  - Intersection has been implemented for combinations of pointlike and linear geometries
  - Added implementation for difference(pointlike, linear)
  - New algorithm is_empty, returning true if the geometry represents the empty set
  - The envelope algorithm supports pointlike and linear geometries in the spherical equatorial coordinate system
  - The envelope algorithm supports pointlike geometries in the geographic coordinate system
- Improvements:
  - Upgraded rtree const_query_iterator category to ForwardIterator.
  - Buffer performance of buffers around multi-points is improved significantly
- Breaking changes:
  - buffer side strategy now returns error_code instead of bool. If you have your own custom side strategy, it should be adapted
- Solved tickets:
  - #11113 Support easy enumeration of all elements with BOOST_FOREACH
  - #11232 Feature request - relate()
  - #11236 Invalid result of centroid() for integer coordinate type
  - #11268 Regression in boost::geometry::intersection interface with multi_linestring and box -- does not compile on 1.57 VS 1.55
  - #11332 Assertion failure in buffer for extreme coordinate differences
  - #11346 Segment iterator does not work with ranges returning values instead of references
  - #11436 sym_difference(py1, py2, mpy) returns invalid multipolygon
- Bugfixes:
  - Buffer: use a more robust way to calculate the side of an intersection, this fixes several errors in buffer generation
  - Fix in selection of segment to which calculate from IP from, in intersection of two segments. Now is selected the one close to a segment-point point, or else the one on the shortest segment. This avoids (rarely occuring) generation of tiny triangles making output polygons invalid
  - In rescaling round instead of truncate to the integer grid (this fix and the previous mentioned can have some impact on output geometries)
  - Fix potential infinite loop in detail::has_spikes (the loop can happen if the points passed have NaN coordinates)
Interprocess:
- ( Trac #5139 ( ("Initial Stream Position in Boost.Interprocess.Vectorstream").
- GitHub Pull #19 ("Fix exception visibility"). Thanks to Romain-Geissler.
Intrusive:
- Implemented map and multimap-like interfaces.
- Refactored hashtable containers to reduce template instantiations.
Lexical Cast:
- Fixed warnings
- Simplified metaprogramming (thanks to Edward Diener)
Log:
- General changes:
  - On systems with symbol visibility support (e.g. Linux) the library is now built with all internal symbols hidden.
  - Breaking change: The library has been ported to Boost.TypeIndex for its underlying type info management tool. This affected the following public interfaces:
    
    invalid_type exceptions thrown by the library now have typeindex::type_index attached as the description of the offending type. The type was previously identified by type_info_wrapper.
    
    Boost.Exception type_info_info error information now contains typeindex::type_index instead of type_info_wrapper.
    
    attribute_value::get_type() now returns typeindex::type_index instead of type_info_wrapper. User-defined attribute value implementations should be similarly changed (the attribute_value::impl::get_type() virtual method now also returns typeindex::type_index).
  - type_info_wrapper component has been deprecated and will be removed in future releases. Boost.TypeIndex is recommended as a replacement.
  - Removed the previously deprecated headers: boost/log/utility/intrusive_ref_counter.hpp, boost/log/utility/explicit_operator_bool.hpp, boost/log/utility/empty_deleter.hpp.
  - Added support for building the library for OpenBSD. (#11446)
  - Improved internal implementation of the event synchronization primitive used for asynchronous logging. (#11398)
- Bug fixes:
  - Fixed incorrect behavior of attribute_value_set::insert() and attribute_value_set constructor in some cases. (#11190)
- See changelog for more details.
Move:
- Changed unique_ptr's converting constructor taking the source by value in C++03 compilers to allow simple conversions from convertible types returned by value.
- Trac #11229: "vector incorrectly copies move-only objects using memcpy",
Multi-index Containers:
- Added ranked indices.
- Maintenance fixes.
Predef:
- Fix many problems with predef_check functionality.
- Update SunPro detection to accomodate latest version of compiler from Oracle.
- Add and and or logical operators for predef_check expression on the Boost Build side.
- Fix BOOST_ARCH_PARISC to correctly spelled name.
- Fix MAKE_YYYYM macros to correctly limit the month.
Program Options:
- Fix compilation errors, missing dllexport and warnings with MSVC and MinGW (Daniela Engert, Marcel Raad).
- Fix unintialized fields (Zoey Greer).
- Stop options with implicit value from consuming separate tokens (Michael John Decker).
- Make multitoken limit be max int, not 32K (Hans Hohenfeld).
- Code formatting and documentation fixes (Jurko Gospodnetić, Lauri Nurmi).
- Minimal support for no-rtti build (Minmin Gong)
- Don't increment environment pointer past the end (Vladimir Prus)
Property Tree:
- A new JSON parser with full Unicode support.
- Breaking change: The new parser does not support comments or string concatenation in JSON files. These features were non-standard extensions of the old parser but their removal could break code which was relying on them.
Boost.Test v3:
- Major new features
  - BOOST_TEST generic assertion
  - data driven test cases
  - test units can now have attributes for finer control over tests behavior (logical grouping, test dependencies, test enabling/disabling)
  - CLI learned colour_output and list_content, extended unit test filtering (negation, labels)
  - refactored and rewritten documentation using quickbook
- Addressed issues:
  - #2018 #2450 #2600 #2717 #2759 #3182 #3316 #3392 #3402 #3445
  - #3463 #3542 #3481 #3495 #3592 #3595 #3623 #3664 #3784 #3785
  - #3811 #3834 #3896 #3932 #3938 #3964 #3978 #3979 #4161 #4275
  - #4389 #4434 #4587 #4806 #4911 #4923 #4924 #4982 #5008 #5036
  - #5262 #5374 #5412 #5563 #5582 #5599 #5718 #5729 #5870 #5972
  - #6002 #6071 #6074 #6161 #6766 #6712 #6748 #7046 #7136 #7410 #7894
  - #8201 #8272 #8467 #8862 #8895 #9179 #9272 #9390 #9409 #9537
  - #9539 #9581 #9960 #10318 #10394 #10888 #11054 #11347 #11358 #11359
TypeIndex:
- Removed dependencies on some of the Boost libraries to improve compilation times and modularity
- Warnings fixed in tests and other maintainance improvements were done.
Variant:
- Fixed missing include in element_index.hpp #11196, #11283
- Fixed boost::apply_visitor usage with C++14 and const references #11251, #11285
- Relaxed compile time checks for all the get<reference>(variant_variable) functions (thanks to Nicolas Cornu)

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4
- Clang, C++14: 3.6
- GCC: 4.4.7, 4.8.2, 4.9.3
- GCC, C++11: 4.4.7
- GCC, C++14: 4.9.3
- Intel: 15.0
Windows:
- Visual C++: 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android:
- Clang: 3.6
- GCC: 4.8, 4.9
SunOS:
- Sun: 6.0
QNX:
- QCC: 4.4.2

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4
- Clang, C++14: 3.6, 3.7
- GCC: 4.4.7, 4.5.3, 4.6.4, 4.7.3, 4.8.1, 5.1.0, 6.0.0
- GCC, C++11: 4.4.7
- GCC, C++14: 4.9.3, 5.1.1
- Intel: 15.0
Android:
- Clang: 3.6
- GCC: 4.8, 4.9
FreeBSD:
- Clang: 3.4.1
- GCC: 4.8.5, 5.1.0, 6.0.0

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.58.0

Fri, 17 Apr 2015 08:53:58 +0100

Known Issue

Boost.Python will fail to build if it is compiled against a version of python that is one of: 3.0.X, 3.1.X, 3.2.X, 3.3.X. Versions 2.X and 3.4+ are not affected. This is fixed in git.
Boost.Fusion has a regression with non-constexpr types. #11211 This is fixed in some PRs: Github PR #70, Github PR #71, Github PR #72

Patches:

0001-Fix-exec_file-for-Python-3-3.4.patch (for libs/python).
0002-Fix-a-regression-with-non-constexpr-types.patch (for libs/fusion).

New Libraries

Endian: Types and conversion functions for correct byte ordering and more regardless of processor endianness.
Sort: Includes spreadsort, a general-case hybrid radix sort that is faster than O(n*log(n))

Updated Libraries

Asio:
- Ensured errors generated by Windows' ConnectEx function are mapped to their portable equivalents (#10744).
- Added new macro BOOST_ASIO_DISABLE_CONNECTEX to allow use of ConnectEx to be explicitly disabled.
- Fixed a race condition in windows::object_handle when there are pending wait operations on destruction (#10624).
- Fixed IPv6 address parsing on FreeBSD, where a trailing scope ID would cause conversion to fail with EINVAL.
- Worked around shared library visibility issues by ensuring Asio types use default visibility (#9465, #11070).
- Changed the SSL wrapper to call the password callback when loading an in-memory key (#10828).
- Fixed false SSL error reports by ensuring that the SSL error queue is cleared prior to each operation.
- Fixed an ssl::stream<> bug that may result in spurious 'short read' errors.
- Removed a redundant null pointer check in the SSL engine (#10088).
- Added options for disabling TLS v1.1 and v1.2 (#10690).
- Removed use of deprecated OpenSSL function ERR_remove_state.
- Fixed detection of various C++11 features with Clang (#8835, #10884).
- Fixed detection of C++11 std::addressof with g++ (#10982).
- Changed multicast test to treat certain join_group failures as non-fatal.
- Decoupled Asio unit tests from Boost.Test (#11116).
- Changed the tutorial to use std::endl to ensure output is flushed.
- Fixed an unsigned integer overflow reported by Clang's integer sanitizer.
- Added support for move-only return types when using a yield_context object with asynchronous operations.
- Changed yield_context to allow reentrant calls to the completion handler from an initiating function.
- Updated detection of Windows Runtime to work with latest Windows SDK.
Chrono:
- Version 2.0.5
- Fixes:
 - #10778 VC14 CTP4 Atomic don't compile with boost::chrono durations which are not TriviallyCopyable
 - #10840 Missing std:: qualifier for puts call in test_7868.cpp
 - #10851 Missing std:: qualifier for puts call in time_point_output.cpp
 - #10893 Minor doc typo in Boost.Chrono
 - #10992 Chrono IO state savers inconsistent with Boost.IO state savers
 - #10995 duration_put::put_value truncates fractional part
 - #11006 Impossible to instantiate time_fmt_io_saver due to several errors.
 - #11012 chrono_io v2 fail to compile with boost::chrono::duration< boost::rational<int> >
Container:
- Experimental small_vector container.
- Massive dependency reorganization. Now Boost.Container depends on very basic utilities like Boost.Core and Boost.Intrusive. Preprocessed code size have decreased considerably and compilation times have improved.
- Added nth and index_of functions to containers with random-access iterators (except basic_string).
- Added C++17's allocator_traits<Allocator>::is_always_equal.
- Updated containers to implement new constructors as specified in 2210. Missing allocator-extended constructor for allocator-aware containers.
- Fixed bugs:
- Source Breaking: scoped_allocator_adaptor's propagate_on_container_copy_assignment, propagate_on_container_move_assignment and propagate_on_container_swap are no longer ::boost::integral_constant<bool, true/false> types. The dependency reorganization needed to break with those classes to avoid MPL dependencies, and interoperability with std::integral_constant was not guaranteed. Code assumming boost::true_type/boost::false_type on this will not compile. As a workaround, use the guaranteed internal ::value constant: ::boost::integral_constant<bool, scoped_allocator_adaptor<Allocator>::propagate_on_container_move_assignment::value>.
Context:
- support for ARM/iOS (32+64 bit)
- class execution_context (C++14)
Conversion:
- polymorphic_pointer_downcast and polymorphic_pointer_cast functions were added (thanks to Boris Rasin) #10780
- All the functions now throw exceptions using boost::throw_exception
- Documnetation update
DateTime:
- Restored to_time_t function.
- Renamed variable v_type to var_type so it longer conflicts with an AIX system variable.
- Documnetation fixes.
Flyweight:
- Added hash support both with std::hash and boost::hash. This can be optionally disabled to avoid clashes with legacy code where this support has already been defined by the user.
- Maintenance fixes.
Function:
- Added support for functions accepting C++11 rvalues and Boost.Move rvalues #10585.
Functional/Factory:
- Minor breaking change: the default template parameter to indicate that it shouldn't use an allocator is now void, instead of boost::none_t. For details, see the changelog.
Fusion:
- Automatic hash creation function (Github PR #12)
- New ADAPT_STRUCT, ADAPT_ADT, ADAPT_ASSOC_ that deduce the members types (#9516).
- Add convert implementation for Boost.Tuple and std::tuple.
- Add mpl::clear implementation for Boost.Tuple and std::tuple.
- Use boost::declval instead of std::declval, (#10190).
- Remove use of boost::blank (#8622).
- Add result_of::{copy,move} (#5886).
- Better constexpr and noexcept support.
- Improved SFINAE Friendliness of many metafunctions (#10676, #10443).
- result_of::size::value and result_of::size::type::value are the same type now (#7304)
- result_of::at<Seq, N>::type is now defined when sizeof of sequence is less than N (#6507, #7651)
- Fix missing includes (#8457).
- Many documentation fixes & improvements (#6090, #5324, GitHub PR #33, GitHub PR #53, GitHub PR #56)
Geometry:
- Additional functionality:
 - New algorithm num_segments, returning the number of segments of a geometry
 - New overload for is_valid algorithm, that takes a string reference as a second argument and fills it with a message related to the validity or invalidity of the geometry
 - New overload for is_valid algorithm, that takes an enum reference as a second argument and fills it with a value related to the validity or invalidity of the geometry
 - Disjoint and intersects support the following geometry combinations: point/multipoint, multipoint/multipoint, multipoint/segment, multipoint/box
- Improvements:
 - Buffer now supports flat-ends for linestrings with a bend close to the start (such that buffered segment crosses flat-end).
 - Buffer performance is improved significantly
 - Partition performance is improved significantly for polygons, potentially enhancing all overlay operations
- Solved tickets:
 - #8379 Invalid comparison of the result of determinant
 - #10108 Error in overlay operations in specific cases where geometries touch at one point
 - #10201 Suggestion to use different function to compare coordinates [wontfix]
 - #10467 Template parameter name coliding with B0 macro name defined in termios.h
 - #10640 Invalid result of buffer() for CCW Polygons.
 - #10666 MSVC compiler warning C4127: conditional expression is constant
 - #10747 Error in rescaling causing errors in areal/areal set operations
 - #10770 Buffer fails for large distances, or rough round joins, where concavities where not intersected properly
 - #10658 sym_difference yields bad result for int polygons
 - #10835 Difference of multilinestring and polygon yields wrong result
 - #10861 Rtree failing to compile for Value being a pair or a tuple containing pointer to Geometry and the default equal_to<> used
 - #10863 Template parameter name coliding with B0 macro name defined in termios.h (duplicate of 10467)
 - #10887 Invalid result of within() and relate() for Linear/MultiPolygon
 - #10890 Invalid result of disjoint() for Point/Segment.
 - #10904 Invalid calculation of most significant Dimension of a segment in relate_cartesian_segments strategy
 - #10912 Invalid result of within() and relate() for Areal/Areal
 - #10951 Tests failing on windows with intel compiler due to lack of /bigobj flag.
 - #10957 Assertion failure and invalid results of various relational operations.
 - #10958 Invalid results of disjoint() L/L and L/A.
 - #10959 Assertion failure in get_turns() used with no_rescale_policy.
 - #10960 Invalid result of get_turns() for L/A, missing turn.
 - #10961 Invalid result of get_turns() for L/A, invalid turn for a Linear spike.
 - #11112 Compilation failure on Solaris due to a CS name clash (used for a macro on this platform)
 - #11121 Invalid result of difference() for integral coordinates
- Bugfixes:
 - Bug in multipoint/polygon multipoint/multipolygon distance computation (wrong detection of points inside the areal geometry)
 - Bug in flatten_iterator's assignment operator causing an access violation
 - Bug in Cartesian segment-segment intersection strategy when one segment degenerates to a point and is collinear to the other non-degenerate segment
 - Bug in centroid(), non-deterministic result if calculated for e.g. a Polygon with zero-area.
 - Bug in buffers for joins with a limited number of points
 - Bug in buffers for round joins with limited number of points around sharp corners
 - Bug in buffers for joins with large buffer distances
 - Bug in buffers for round ends with an odd number of points
 - Bug in buffers for flat ends with large buffer distances
 - Bug in buffers for interior rings with large negative buffer distances
 - Bug in closing_iterator not working properly when the input range is empty
 - Bug in is_simple, not handling properly closed simple linestrings within multilinestrings
 - Bug in rtree constructors taking a pair of Iterators or a Range (packing algorithm), the use of reference to destroyed temporary when Iterator's reference is not true reference, e.g. for some of the Range Adaptors. It also affects distance() and comparable_distance(). This bug may cause unexpected behavior of the rtree or distance() algorithm, e.g. an assertion failure or a SEGFAULT.
 - Bug in rtree count() member function, the use of reference to destroyed temporary when object of type convertible but not the same as value_type or indexable_type is passed. If this happens, wrong result may be returned, in most cases 0.
 - Bugs related to the handling of Ranges, preventing compilation of Geometries using non-Container Ranges in some algorithms (thanks to Samuel Debionne)
Hash:
- Fixed strict aliasing violation (GitHub #3).
Interprocess:
- Reduced some compile-time dependencies. Updated to Boost.Container changes.
- Fixed bugs:
  - GitHub Pull #13 ("haiku: we don't have XSI shared memory, so don't try to use it").
Intrusive:
- Reduced compile-time dependencies, headers, and the use of Boost.Preprocessor, specially for hooks and iterators.
- Fixed bugs:
Lexical Cast:
- Now std::stream is used for conversions to float numbers #5660, #6975, #10639
Log:
- Bug fixes:
  - Fixed thread id formatting.
  - Fixed process id formatting. (#10926)
  - Fixed build failure on GNU Hurd.
  - Fixed incorrect behavior of text file sink backend in case if free space on the file system gets exhausted. The sink will no longer create lots of empty files in attempt to recover. (#11016)
  - Fixed incorrect behavior of attribute_set::insert() in some cases. The inserted elements could have made some previously inserted elements not findable. (#11106)
  - Fixed incorrect behavior of attribute_value_set::size() if a large number of attribute values are inserted into the set. (#11148)
- See changelog for more details.
Math:
- Added two new special functions - trigamma and polygamma.
- Large update to the Elliptic integral code to use Carlson's latest algorithms - these should be more stable, more accurate and slightly faster than before. Also added support for Carlson's RG integral.
- Added ellint_d, jacobi_zeta and heuman_lambda elliptic integrals.
- Fixed namespace scope constants so they are constexpr on conforming compilers, see #10901.
- Fixed various cases of spurious under/overflow in the incomplete beta and gamma functions, plus the elliptic integrals, with thanks to Rocco Romeo.
- Fix 3-arg legendre_p and legendre_q functions to not call the policy based overload if the final argument is not actually a policy.
- Cleaned up some dead code in the incomplete beta function, see #10985.
- Fixed extreme-value pdf for large valued inputs, see #10938.
- Switched documentation to use SVG rather than PNG graphs and equations - browsers seem to have finally caught up!
Move:
- Added BOOST_MOVE_BASE utility.
- Added adl_move_swap utility.
- Reduced dependencies on other Boost libraries to make the library a bit more lightweight.
- Fixed bugs:
  - Trac #11044: "boost::rv inherits off union, when such passed as template argument".
Multi-index Containers:
- The efficiency of lookup operations has improved in situations where they involve the generation of temporary values of key_type. Consider for instance the following code:
```
typedef multi_index_container<
 std::string,
 indexed_by<
 ordered_unique<identity<std::string> >
 >
> multi_t;
...
multi_t m=...;
m.find("boost"); // passed a const char*, not a std::string 
```
 In previous versions of the library, the find operation generates several temporary std::strings (one every time an internal comparison is made). In sufficiently advanced compilers, this is now avoided so that only one temporary is created.
- Maintenance fixes.
Multiprecision:
- Changed frexp to always be non-expression template generating, see: 10993.
- Improved support of cpp_dec_float on Cygwin and other platforms with missing long double support, see 10924.
- Improved noexcept support and added some more tests, see 10990.
- Various workarounds applied for Intel-15.0 and Solaris-12.4 compilers.
Optional:
- Improved documentation; documented IO operations and header files.
- Fixed Bugs:
 - boost::none_t is no longer convertible from literal 0. This avoids a bug where optional<rational<int>> oi = 0; would initialize an optional object with no contained value.
 - Added a way to manually disable move semantics: just define macro BOOST_OPTIONAL_CONFIG_NO_RVALUE_REFERENCES. This can be used to work around #10399.
 - #10825 Improved the trick that prevents streaming out optional without header optional_io.hpp by using safe-bool idiom.
 - #11087 It is no longer possible to assign optional to optional<T> when U is not assignable or convertible to T.
 - #10839 Value accessors now work correctly on rvalues of optional<T&>.
Phoenix:
- Version 3.2.0
- New Features:
  - Phoenix now has a lazy list implementation as an optional extension.
- New Example:
  - A new example bind_goose shows the compatibility between boost bind and boost phoenix bind.
- Fixed Bugs:
  - #10927 Missing std:: qualifier for fabs in phoenix/test/stdlib/cmath.cpp
  - #11085 Missing qualifier for pow call in phoenix/test/function/function_tests.cpp
  - Fixes for a number of cases failing with bind, lambda and let.
Predef:
- Version 1.2
- Added Visual Studio 2015 detection.
- Added detection of Haiku OS.
- Fix Android endian detection.
- Added predef_check program and BBv2 integration for build configuration checks.
Random:
- Added non_central_chi_squared_distribution.
Thread:
- Version 4.5.0
- New Experimental Features:
 - #9600 Async: Add task_region
 - #10611 Add emplace promise::set_value and emplace make_ready_future
 - #10826 Add scheduled executor operations
 - #11048 Add a serial_executor based on continuations
- Fixed Bugs:
 - #6787 boost::thread::sleep() hangs if system time is rolled back
 - #10734 Submit method work differently on different executors, some throw exception and some silently ignore error (thread_executor and inline_executor)
 - #10736 Task exceptions silently ignored. I think std::terminate solution from N3785 and std::thread is better choice and more consistent.
 - #10737 In serial_executor we have infinite wait if task throw exception.
 - #10822 Boost.Thread fails to compile on Android
 - #10824 Boost.Thread 1.57 breaks Windows XP compatibility for SP2 and below.
 - #10963 future<future<T>>::then Has No Implementation
 - #10964 future<future<T>>::unwrap().then() Deadlocks
 - #10968 The futures returned by async() and future::then() are not blocking.
 - #10971 shared_future::get()/get_or() must be const
 - #10972 shared_future::then() can be called multiple times.
 - #10979 Support T& type deduction when the make_ready_future parameter is reference_wrapper<T>
 - #10996 Thread physical_concurrency() is failing on Windows
 - #11035 BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE not defined for Android
 - #11053 The attached code results in a R6025 - pure virtual function call in run_thread_exit_callbacks
TypeErasure:
- Fixed compilation with MSVC 12.
TypeIndex:
- Link time assertions added on platforms that support it
Units:
- Fix for base units with arbitrary dimensions.
Unordered:
- Fix move assignment with stateful, propagate_on_container_move_assign allocators (#10777).
- Fix potential overflow when calculating number of buckets to allocate (GitHub #4).
- Other minor changes, see changelog.
Variant:
- Breaking change: Compile time checked getter is now used by default in boost::get(VariantT) and boost::polymorphic_get(VariantT). New getter asserts that type U is one of the types that can be stored in VariantT. Define BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT to change default behavior. See get.hpp and polymorphic_get.hpp descriptions for more info #547.
- Added missing comparison operators to variant #8620, #10811
- Multiple documentations fixes #10273, #10653
- Variadic templats enabled on Clang #10832
- Autodetection of return types for visitors in C++14, which makes it possible to use boost::apply_visitor with generic lambdas #10837:
```
auto str = boost::apply_visitor(
 [](auto v) {
 return boost::lexical_cast<std::string>(v);
 },
 variant_instance
);
```
- Improved swap functions #10882
- Many improvements to variadic templates, even more methods support variadics.
- Multiple bugfixes and testing improvements including Coveralls integration

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4
- Clang, C++14: 3.5, 3.6
- GCC: 4.4.7, 4.9.2
- GCC, C++98: 4.8.1, 4.8.2
- GCC, C++11: 4.4.7, 4.8.4, 4.9.2
- GCC, C++14: 4.9.2
Windows:
- GCC, mingw: 4.4.7, 4.5.4, 4.6.3, 4.7.3, 4.8.2
- Visual C++: 8.0, 9.0, 10.0, 11.0, 12.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4
- Clang, C++14: 3.5, 3.6
- GCC: 4.4.7, 4.6.4, 4.7.3, 4.8.1, 4.9.2, 5.0.0 (experimental)
- GCC, C++11: 4.4.7, 4.8.4, 4.9.2
- GCC, C++14: 4.9.2
Windows:
- GCC, mingw: 4.4.7, 4.5.4, 4.6.4, 4.7.3
- Visual C++: 8.0, 9.0, 10.0, 11.0, 12.0, 14.0
Android
- Clang: 3.4, 3.5
- GCC: 4.8, 4.9
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.57.0

Mon, 3 Nov 2014 15:55:36 -0600

Updated Libraries

Any:
- RTTI is not required any more (TypeIndex library is used for RTTI emulation)
- Fixed #8958
Asio:
- Fixed the kqueue reactor so that it works on FreeBSD (#10606).
- Fixed an issue in the kqueue reactor which resulted in spinning when using serial ports on Mac OS (#10496).
- Fixed kqueue reactor support for read-only file descriptors (#10367).
- Fixed a compile error when using the /dev/poll reactor (#10350, #10572).
- Changed the Windows backend to use WSASocketW, as WSASocketA has been deprecated (#10534).
- Fixed some warnings reported by Visual C++ 2013 (#10376).
- Fixed integer type used in the WinRT version of the byte-order conversion functions (#10539).
- Changed documentation to indicate that use_future and spawn() are not made available when including the asio.hpp convenience header (#10567).
- Explicitly marked asio::strand as deprecated. Use asio::io_service::strand instead.
Circular Buffer:
- Fixed some warnings and move_if_noexcept from Boost.Move is used #7888
Config:
- BOOST_HAS_PRAGMA_DETECT_MISMATCH macro was added
Container:
- Added support for initializer_list. Contributed by Robert Matusewicz.
- Fixed double destruction bugs in vector and backward expansion capable allocators.
- Fixed bugs:
  - Trac #10263 ("AIX 6.1 bug with sched_yield() function out of scope").
  - GitHub #16: Fix iterators of incomplete type containers. Thanks to Mikael Persson.
Coroutine:
- optionally register stacks with valgrind
- #10386 MSVC link error in asymmetric_coroutine.hpp: symbol already defined
- #10536 call to 'begin(...pull_coroutine< R > & c)' is ambiguous
Flyweight:
- Added serialization support via Boost Serialization.
- flyweight default constructor was made explicit in Boost 1.56, which introduces a regression in some initialization scenarios. The former non-explicit default constructor has been restored (ticket #10439).
Geometry:
- Improvements
  - The support of parameters convertible to value_type in rtree insert(), remove() and count() functions
- Solved tickets
  - 8402 Implicit conversion warnings
  - 9354 Bug in winding strategy affecting within() and covered_by() for non-cartesian coordinate systems
  - 10177 Missing include
  - 10345 Distance fails to compile for some coordinate types
  - 10398 Wrong neighbour check in buffer, calculating turns
  - 10421 Invalid Point-Box distance for spherical CS
  - 10615 Rtree constructor feature request
  - 10643 Invalid point_on_surface() result for big coordinates
  - 10668 Implicit conversion warnings (duplicated 8402)
- Bugfixes
  - Several fixes of bugs in algorithm buffer
  - Bug in point_on_surface() for CCW Polygons (extreme_points()) and numerical issue (thanks to Matt Amos)
  - Bug in disjoint() for A/A fixed by replacement of point_on_surface() with point_on_border() (thanks to Matt Amos)
  - The result of convex_hull(), duplicated Point in open output, too small number of Points for 1- and 2-Point input
  - Imprecision for big coordinates in centroid(), fixed by Points translation (related with ticket 10643)
  - for_each_segment() not taking into account the last segment of open Geometry
Interprocess:
- Removed unique_ptr, now forwards boost::interprocess::unique_ptr to the general purpose boost::movelib::unique_ptr class from Boost.Move. This implementation is closer to the standard std::unique_ptr implementation and it's better maintained.
- Fixed bugs:
- Reorganized Doxygen marks to obtain a better header reference.
Intrusive:
- Experimental version of node checkers, contributed by Matei David. Many thanks!
- Implemented N3644: Null Forward Iterators from C++14.
- Fixed bugs:
Iterator:
- Most components of the library were moved into the boost::iterators namespace. For backward compatibility the components are also accessible in the boost namespace.
- Iterator operators are now conditionally defined based on the iterator category.
- Some of the internal components of the library were made public (minimum_category, for example).
Lexical Cast:
- Some internal changes, library now consist of multiple headers instead of a single one #10391, #10173
Math:
- Added Hyperexponential Distribution.
- Fix some spurious overflows in the incomplete gamma functions (with thanks to Rocco Romeo).
- Fix bug in derivative of incomplete beta when a = b = 0.5 - this also effects several non-central distributions, see issue 10480.
- Fixed some corner cases in function round.
- Don't support 80-bit floats in cstdfloat.hpp if standard library support is broken.
Move:
Added unique_ptr smart pointer. Thanks to Howard Hinnant for his excellent unique_ptr emulation code and testsuite.
Added move_if_noexcept utility. Thanks to Antony Polukhin for the implementation.
Fixed bugs:
MultiArray:
- Fixed a friend-declaration related warning for clang (thanks to Marcel Raad).
Multiprecision:
- Changed rational to float conversions to exactly round to nearest.
- Added improved generic float to rational conversions.
- Fixed rare bug in exponent function for cpp_bin_float.
- Fixed various minor documentation issues.
Multi-index Containers:
- When std::tuples are available, these can be used for lookup operations in indices equipped with composite keys. boost::tuples are also supported for backwards compatibility.
Preprocessor:
- Added is_begin_parens and remove_parens.
- Added tuple functionality to parallel all array functionality.
- Fixed VC++ problems with empty tuple data.
- Updated internal is_empty to use superior variadic version when variadic macros are supported.
- Updated clang to have same variadic support as gcc.
- Updated doc for new functionality.
Thread:
- New Experimental Features:
 - #6227 Synchro: Use of variadic templates on Generic Locking Algorithms on compilers providing them
 - #10298 Synchro: Added queue views.
 - #10300 Async: Added generic_executor_ref.
 - #10552 Add make_valid_future
- Fixed Bugs:
 - #6782 call_once uses incorrect barrier intrinsic on Visual Studio
 - #6787 boost::thread::sleep() hangs if system time is rolled back
 - #7665 this_thread::sleep_for no longer uses steady_clock in thread
 - #9307 future::fallback_to assert with ERRORRRRR boost: mutex lock failed in pthread_mutex_lock: Invalid argument
 - #9308 future::async fails with terminate called throwing an exception when called with a lambda - clang-darwin-asan11
 - #9310 test_4648_lib fails on clang-darwin-asan11
 - #9425 Boost promise & future does not use supplied allocator for value storage
 - #9558 future continuations unit test hangs in get()/pthread_cond_wait() on Mac 10.7/32-bit/x86/darwin-4.2.1
 - #9787 [windows] Small duration value passed down to basic_timed_mutex::try_lock_until and condition_variable::wait_until can cause infinite or near infinite wait for win32
 - #9880 [windows] boost::condition_variable.timed_wait() exception if system time < 1970
 - #10159 GCC 4.4 error sorry, unimplemented
 - #10196 thread_specific_ptr does not support void*
 - #10296 Boost.Thread 1.56 rc1 does not compile on Mingw
 - #10297 Boost.Thread 1.56 rc1 hangs when built with clang on armhf
 - #10340 No boost::promise<T>::set_value(const T&) overload present in C++03 mode
 - #10425 Missing documentation for when_all/when_any.
 - #10426 Take in account the deferred futures in when_all.
 - #10427 Take in account the deferred and ready futures in when_any.
 - #10428 Adapt to new unique_ptr interface in Boost.Move
 - #10465 Missing implementation of when_all/when_any when the result is a tuple.
 - #10476 classes using BOOST_THREAD_MOVABLE_ONLY<T> dont satisfy is_copy_constructible<T>::value == false
 - #10478 Data race in boost/thread/future.hpp
 - #10529 The pthread/condition_variable_any constructor reports incorrect error code for pthread_cond_init
 - #10563 shared_future<R>::then should be const
TypeIndex:
- BOOST_HAS_PRAGMA_DETECT_MISMATCH is now used to detect ODR violations #10404
- Typos fixed #10294
TypeTraits:
- Added new traits is_copy_assignable and is_final.
Units:
- New unit system <boost/units/systems/information.hpp> units for: bit, byte, nat, hartley and shannon,
- Add scale units for binary prefixes kibi, mebi, gibi, tebi, pebi, zebi and yobi IEC prefixes
- Fix output of NaN on msvc-14
- Add support for C++11 numeric_limits::max_digits10 and ::lowest
- warning fixes
Unordered:
- Fix the pointer typedef in iterators (#10672).
- Fix Coverity warning (GitHub #2).
Utility:
- The next() and prior() functions taking distance arguments were reworked. The code now work correctly when the distance is unsigned or both arguments are integers. The new code relies on the availability of operators supported by the first argument to select the correct implementation.
uBLAS:
- added two new types: matrix_row and matrix_column facades . With them, it is possible to access to the matrices as an array of rows and an array of columns, respectively.
- added fixed_vector/fixed_matrix classes to represent small - fixed size containers. Requires c++11 because it is using std::array
- fixed the long standing banded matrix bug (https://svn.boost.org/trac/boost/ticket/7549).
- the interface of matrices and vectors has been extended with cbegin, cend, crbegin and crend member functions, as defined in c++11.
- removed doxygen documentation to make the distribution lighter
- removed warnings with MSVC for unused parameters
- changed the uBlas development folder structure (will not affect users of the library)
- performed a very large overhaul with respect to warnings and errors on various compilers. Apart for some hard to resolve warnings and older compiler incompatibilities, compilations with uBlas will be much cleaner now.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4
- Clang, C++14: 3.5
- GCC: 4.4.7, 4.5.3, 4.6.4, 4.7.3, 4.8.1, 4.8.2
- GCC, C++98: 4.9.1
- GCC, C++11: 4.4.7, 4.8.2, 4.8.3, 4.9.1
- GCC, C++14: 4.9.1
- Intel: 13.1, 14.0
- Intel, C++11: 13.1, 14.0
- QCC: 4.4.2
OS X:
- Apple Clang: 6.0
- Apple Clang, C++11: 6.0
- Apple Clang, C++14: 6.0
- GCC: 4.2.1, 4.9.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.4.0, 4.4.7. 4.5.4, 4.6.3, 4.7.2, 4.7.3, 4.8.0, 4.8.2, 4.9.0
- Visual C++: 8.0, 9.0, 10.0, 11.0, 12.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, 3.3, 3.4.2
- Clang, C++14: 3.5.0, trunk
- GCC: 4.4.7, 4.6.4, 4.7.3, 4.8.1, 4.8.2, 5.0 (experimental)
- GCC, C++11: 4.4.7, 4.8.2, 4.8.3, 4.9.1
- GCC, C++14: 4.9.1
- Intel: 11.1, 12.1, 13.0, 13.1, 14.0
- Intel, C++11: 13.1, 14.0
OS X:
- Apple Clang: 6.0
- Apple Clang, C++11: 6.0
- Apple Clang, C++14: 6.0
- Clang: trunk
- Clang, C++11: trunk
- GCC: 4.2.1, 4.9.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.3, 4.8.0, 4.8.2, 4.9.0
- Visual C++: 8.0, 9.0, 10.0, 11.0, 12.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.56.0

Thu, 7 Aug 2014 09:08:22 -0700

Other Downloads

Windows binaries

Modularization

Boost version control has migrated to a system using git submodules. This shouldn't make too much of a difference to users, although the directory structure is now a bit different.

Parts of some libraries have been moved into different modules, and several new modules have been extracted from existing code. All header paths should remain the same. The new modules are:

Assert: Customizable assert macros. Maintained by Peter Dimov.
Core: Core utilities used by other libraries, with minimal dependencies. Maintained by Peter Dimov, Glen Fernandes and Andrey Semashev.
Lexical_Cast: General literal text conversions, such as an int represented a string, or vice-versa, from Kevlin Henney.
Throw_Exception: A common infrastructure for throwing exceptions from Boost libraries, from Emil Dotchevski.
Winapi: Windows API declarations without <windows.h>, for internal Boost use.

New Libraries

Align: Memory alignment functions, allocators, and adaptors, from Glen Fernandes.
Type_Index: Runtime/Compile time copyable type info, from Antony Polukhin.

Updated Libraries

Acumulators:
- New accumulators rolling_variance and rolling_moment
Any:
- Fixed rvalue references related issues (#9215, #9462).
- Dropped support of antique compilers.
Asio:
- Fixed asio::spawn() to work correctly with new Boost.Coroutine interface (#9442, #9928).
- Ensured that incomplete asio::spawn() coroutines are correctly unwound when cleaned up by the io_service destructor (#9731).
- Fixed delegation of continuation hook for handlers produced by io_service::wrap() and strand::wrap() (#9741).
- Changed the Windows I/O completion port backend to use ConnectEx, if available, for connection-oriented IP sockets.
- Changed the io_service backend for non-Windows (and non-IOCP Windows) platforms to use a single condition variable per io_service instance. This addresses a potential race condition when run_one() is used from multiple threads.
- Prevented integer overflow when computing timeouts based on some boost::chrono and std::chrono clocks (#9662, #9778).
- Made further changes to EV_CLEAR handling in the kqueue backend, to address other cases where the close() system call may hang on Mac OS X.
- Fixed infinite recursion in implementation of resolver_query_base::flags::operator~ (#9548).
- Made the select reactor more efficient on Windows for large numbers of sockets (#9528).
- Fixed a Windows-specific type-aliasing issue reported by gcc (#9550).
- Prevented execution of compile-time-only buffer test to avoid triggering an address sanitiser warning (#8295).
- Disabled the GetQueuedCompletionStatus timeout workaround on recent versions of Windows.
- Added support for string-based scope IDs when using link-local multicast addresses.
- Changed IPv6 multicast group join to use the address's scope ID as the interface, if an interface is not explicitly specified.
- Fixed multicast test failure on Mac OS X and the BSDs by using a link-local multicast address.
- Worked around a gcc problem to do with anonymous enums (#10042).
- Reverted the Windows HANDLE backend change to ignore ERROR_MORE_DATA. Instead, the error will be propagated as with any other (i.e. in an error_code or thrown as a system_error), and the number of bytes transferred will be returned. For code that needs to handle partial messages, the error_code overload should be used (#10034).
- Fixed an off-by-one error in the signal_set implementation's signal number check (#9324).
- Changed to use SSE2 intrinsics rather than inline assembly, to allow the Cray compiler to work.
- Stopped using certain Winsock functions that are marked as deprecated in the latest Visual C++ and Windows SDK.
- Added a workaround for building the unit tests with gcc on AIX.
- Various minor documentation improvements (#8295, #9605, #9771).
Assign:
- Resolve some C++11 ambiguities (#3073).
Atomic:
- The library has been redesigned. Besides internal refactoring, various bugs were fixed, including incorrect values of feature test macros and integer overflow handling.
- Changed values of the memory_order enumeration. The concrete values are not part of the interface, but this change may potentially break ABI, if the enum is used in user's interfaces.
- Implemented support for 128-bit atomic operations on Windows x64 with MSVC. The library assumes presence of the cmpxchg16b instruction in the target CPUs. Some early AMD CPUs don't support this instruction. To target those define the BOOST_ATOMIC_NO_CMPXCHG16B macro.
- Implemented experimental support for Windows ARM target with MSVC.
- Implemented experimental support for DEC Alpha target with GCC.
- Improved support for ARMv6 and later with GCC. Implemented all atomic operations as assembler blocks instead of CAS-based loops. 64-bit operations are supported with ARMv7.
- Implemented optional support for the BOOST_ATOMIC_FLAG_INIT macro and static initialization of atomic_flag. (#8158)
- Fixed compilation for SPARCv9 target. (#9446)
- Fixed compilation for PowerPC target. (#9447)
- Fixed several compatibility problems with Clang on x86 and x86-64. (#9610, #9842)
- Removed specialized code for Windows on IA64 platform.
Circular Buffer:
- #9970,#9334 Support for the C++11 allocator model.
- Dropped support of antique compilers.
Concept Check:
- Fewer warnings (includes #5012).
Container:
- Added DlMalloc-based Extended Allocators.
- Improved configurability of tree-based ordered associative containers. AVL, Scapegoat and Splay trees are now available to implement set, multiset, map and multimap.
- Fixed bugs:
Context:
- fcontext_t is opaque pointer to context-data
- changed signature of make_fcontext()
- #8826 no executable stack
- #9437 catch exceptions on iOS and Windows Phone 8
- #9445 support for x32 ABIs
- #9522 support for powerpc_64le
- #9743 bugfix for powerpc_64 le/be
- #9774 bugfix for x86 on Mac OS X + clang
Coroutine:
- support of symmetric coroutines
- #9355 fix race condition in protected_stack_allocator
- #9551 list of supported architectures
- #9734 wrong check of mmap() return value
- #9735 no memset() for protected_stack_allocator
- #9760 coroutine iterator need const operator==
- #10070 mmap() return value
- #10157 file descriptor not required in protected_stack_allocator
Dynamic Bitset:
- Support for C++11 move constructors
- Warning fixes on MSVC 2013
- Support for C++11 minimal allocators
- Add noexcept specifications
Chrono:
- #6918 Boost Chrono compilation failure on HP uX due to undefined pthread_getcpuclockid
- #8006 Boost::Chrono Assertion at startup - steady_clock::now() - Windows
- #9337 chrono::process_cpu_clock time points wrong by factor 1000 on Linux
- #9342 Regression on process_cpu_clock::timepoint io on V2
- #9419 boost::chrono::floor()/round() and negative durations is wrong
- #9698 boost::chrono::thread_clock not declared in OSX
- #9720 boost::this_thread::sleep_for() sometimes returns immediately on win32
- #9859 Remove references to gcc-mingw
- #9918 chrono compilation error on Solaris, funciton timegm
- #9811 boost/boost/chrono/duration.hpp:355:56: error: call to non-constexpr function 'static std::numeric_limits<float>::_Ty std::numeric_limits<float>::max()' /home/zosun/input_service/inputservices-core-service/other/boost/boost/chrono/duration.hpp: In static member function 'static constexpr double boost::chrono::detail::chrono_numeric_limits<double, true>::lowest()':
- #10069 Overflow in chrono clocks on 32bit
- #10151 timegm function not available on QNX
Flyweight:
- In compilers with variadic template support, boost::flyweight<T> now provides a perfectly forwarding constructor to T::T (previously an emulation was used).
- flyweight now replicates the initializer-list constructors and assignment operators of its underlying type.
- Fixed intermodule static initialization problem (ticket #9553).
- Maintenance fixes.
Fusion:
- Fusion is enabled for use on GPU
Geometry:
- Additional functionality
  - New algorithm buffer for inflating/deflating geometries (buffer itself already existed but that was only to enlarge a box)
  - New algorithm remove_spikes, algorithm to remove spikes from a ring, polygon or multi_polygon.
  - New algorithm point_on_surface, generating a point lying on the surface (interior) of the polygon
  - New algorithm is_simple, returning true if a geometry is simple according to the OGC standard
  - New algorithm is_valid, returning true if a geometry is valid according to the OGC standard
  - New algorithm crosses for checking this spatial relation according to the OGC standard
  - The set operation algorithms (difference, intersection, sym_difference and union_) now support as input pairs of pointlike or linear geometries
  - The distance and comparable_distance algorithms now support all pairs of geometry combinations
  - The spatial relations which didn't support it (covered_by, touches, within, etc.) now support as input linear and/or areal geometries
  - The support for boost::variants as input geometries in various algorithms
  - The rtree support for indexing segments
  - The rtree nearest() predicate support for arbitrary geometries
- Solved tickets
  - 8310 Wrong results with overlapping polygons (fixed using point_on_surface for disjoint)
  - 8375 sym_difference of non-closed polygons returns closed polygon
  - 8376 difference of non-closed polygons returns closed polygon
  - 9081 Booleans create self-intersecting polygons from non-self-intersecting polygons
  - 9245 Check for process errors in make_qbk.py
  - 9563 (Sym)difference not successful, fixed by rescaling to robust type
  - 9628 Wrong result of within() due to the winding strategy not working correctly for nearly-horizontal segments
  - 9871 Remove spike in polygon with only a spike
  - 9947 Missing info about WKT in documentation
  - 9759 Invalid results of R-tree knn queries for non-cartesian coordinate systems
  - 10019 Difference of Linestring and Box returns their intersection
  - 10077 Wrong types in concept checks in boost/geometry/arithmetic/arithmetic.hpp
- Bug fixes
  - intersects(polygon) could return a self-intersection-point for its closing point, fixed
  - equals() could return invalid results for non-simple linear geometries according to the OGC standard, fixed
  - touches() didn't work properly for CCW areal geomtries, fixed
  - rtree nearest queries returned wrong elements for non-cartesian coordinate systems, fixed
  - rtree crashed in some cases when used with Interprocess allocator, fixed
Hash:
- Removed some Visual C++ 6 workarounds.
- Ongoing work on improving hash_combine, this changes the previously documented algorithm for the function.
Interprocess:
- Fixed bugs:
- ABI breaking: #9221 showed that BOOST_INTERPROCESS_MSG_QUEUE_CIRCULAR_INDEX option of message queue, was completely broken so an ABI break was necessary to have a working implementation.
- Simplified, refactored and unified (timed_)lock code based on try_lock(). There were several bugs when handling timeout expirations.
- Changed the implementation of condition variables' destructors to allow POSIX semantics (the condition variable can be destroyed after all waiting threads have been woken up)..
- Added BOOST_INTERPROCESS_SHARED_DIR_PATH option to define the shared directory used to place shared memory objects when implemented as memory mapped files.
- Added support for BOOST_USE_WINDOWS_H. When this macro is defined Interprocess does not declare used Windows API function and types, includes all needed windows SDK headers and uses types and functions declared by the Windows SDK.
- Added get_size to windows_shared_memory.
Intrusive:
- Improved Doxygen generated reference and updated and fixed forward-declaration header.
- ABI breaking: Fixed ABI regression introduced in Boost 1.55 version, mainly noticeable on MSVC compilers.
- Source breaking: Removed previously deprecated xxx_dont_splay functions from splay containers, splay_set_base_hook and splay_set_member_hookfrom splay containers and bool splay = true extra parameter in splaytree_algorithms functions.
- Fixed bugs:
- Optimized tree rebalancing code to avoid redundant assignments.
- Added 64 bit prime values for suggested_upper_bucket_count/suggested_lower_bucket_count in 64 bit platforms.
- Deleted workarounds for old SUN_CC compilers, those are now unsupported as modern SunPro compilers are standard-corforming enough.
Lexical Cast:
- Added the try_lexical_convert function, that retuns false in case of failed conversion and does not require output parameter to be Default Constructable (#6700).
- Fixed conversion of string values with leading zeroes to bool (#9659).
- Code was changed to produce a smaller binaries and simplify compiler's work (#9046).
- Boost.LexicalCast library was separated from the Boost.Conversion library.
- Fixed some warnings (#8991).
Log:
- General changes:
  - For Windows targets, the library now compiles for Windows XP by default.
  - Added indexing operators with attribute_name arguments to record and record_view.
  - Added operators for non-const object output to basic_formatting_ostream. (#9389)
  - Added support for putting function names and source file names of named scopes into the formatted strings. (#9263)
  - Added support for incomplete and empty markers to the named scope formatter. (#9123)
  - The default presentation for incomplete named scope lists has changed: trailing scope delimiter is omitted.
  - Added a support header for std::regex.
  - By default Boost.Log uses Boost.Regex internally as the regular expressions backend. The backend can be changed by defining configuration macros.
- Bug fixes:
  - Fixed dump manipulator output on AVX2-enabled CPUs (e.g. Intel Haswell).
  - Fixed compilation of get_attribute method of loggers.
  - Fixed a possible race in locked_backend() function implementation of synchronous and asynchronous sink frontends.
  - Fixed a possible infinite block of the logging threads in the asynchronous sink enqueue methods when block_on_overflow strategy was used.
- See changelog for more details.
Math:
- Breaking change: moved a number of non-core headers that are predominantly used for internal maintenance into libs/math/include_private. The headers effected are boost/math/tools/test_data.hpp, boost/math/tools/remez.hpp, boost/math/constants/generate.hpp, boost/math/tools/solve.hpp, boost/math/tools/test.hpp. You can continue to use these headers by adding libs/math/include_private to your compiler's include path.
- Breaking change: A number of distributions and special functions were returning the maximum finite value rather than raising an overflow_error, this has now been fixed, which means these functions now behave as documented. However, since the default behavior on raising an overflow_error is to throw a std::overflow_error exception, applications which have come to reply rely on these functions not throwing may experience exceptions where they did not before. The special functions involved are gamma_p_inva, gamma_q_inva, ibeta_inva, ibetac_inva, ibeta_invb, ibetac_invb, gamma_p_inv, gamma_q_inv. The distributions involved are pareto_distrib, beta_distrib, geometric_distrib, negative_binomial_distrib, binomial_distrib, chi_squared_distrib, gamma_distrib, inverse_chi_squared_distrib, inverse_gamma_distrib. See #10111.
- Fix round and trunc functions so they can be used with integer arguments, see #10066.
- Fix Halley iteration to handle zero derivative (with non-zero second derivative), see #10046.
- Fix Geometric distribution use of Policies, see #9833.
- Fix corner cases in the negative binomial distribution, see #9834.
- Fix compilation failures on Mac OS.
- Added bernoulli_numbers, changed arbitrary precision tgamma/lgamma to use Sterling's approximation (from Nikhar Agrawal).
- Added first derivatives of the Bessel functions: cyl_bessel_j_prime, cyl_neumann_prime, cyl_bessel_i_prime, cyl_bessel_k_prime, sph_bessel_prime and sph_neumann_prime (from Anton Bikineev).
- Fixed buggy Student's t example code, along with docs for testing sample means for equivalence.
- Documented max_iter parameter in root finding code better, see #9225.
- Add option to explicitly enable/disable use of __float128 in constants code, see #9240.
- Cleaned up handling of negative values in Bessel I0 and I1 code (removed dead code), see #9512.
- Fixed handling of very small values passed to tgamma and lgamma so they don't generate spurious overflows (thanks to Rocco Romeo).
- #9672 PDF and CDF of a Laplace distribution throwing domain_error Random variate can now be infinite.
- Fixed several corner cases in rising_factorial, falling_factorial and tgamma_delta_ratio with thanks to Rocco Romeo.
- Removed constant pow23_four_minus_pi whose value did not match the name (and was unused by Boost.Math), see #9712.
Move:
- Added BOOST_MOVE_RET.
- Fixed bug #9482: "MSVC macros not undefined in boost/move/detail/config_end.hpp", #9045: "Wrong macro name on docs", #8420: "move's is_convertible does not compile with aligned data".
MPL:
- boost::mpl::for_each is enabled for use on GPU
MultiArray:
- #5664 operator() checks for Collection concept but requires RandomAccessCollection
- #4874 compile errors using Visual C++ 2010 in debug mode
- #3581 MultiArray storage order example incorrect for fortran_storage_ordering
- #4032 Move MultiArray concepts out of detail namespace
- #9212 Broken links to C++ standard papers
- #8368 GCC -Wundef warning about BOOST_MULTI_ARRAY_NO_GENERATORS in multi_array
Multi-index Containers:
- The erase(iterator) member function of hashed indices used to have poor performance under low load conditions due to the requirement that an iterator to the next element must be returned (see ticket #4264). In accordance with the resolution of LWG issue #579, this problem has been fixed while maintaining the interface of erase, at the expense of using one more word of memory per element. In fact, C++ complexity requirements on unordered associative containers have been improved for hashed indices so that
  - deletion of a given element is unconditionally constant-time,
  - worst-case performance is not O(n) but O(n_dist), where n_dist is the number of non-equivalent elements in the index.
  Due to the fact that hashed indices rely on a new data structure, the internal representation of their iterators and local iterators have changed, which affects serialization: their corresponding serialization class version has been bumped from 0 to 1. Old archives involving hashed index (local) iterators can be loaded by Boost 1.56 version of Boost.MultiIndex, but not the other way around.
- Hashed indices now provide reserve.
- Hashed indices can now be checked for equality and inequality following the (suitably adapted) C++ standard specification in [unord.req].
- The public interface of Boost.MultiIndex provide noexcept specifications where appropriate (for compliant compilers).
- Improved performance of failed insertions into a multi_index_container.
- Much internal code aimed at supporting MSVC++ 7.0 and prior has been removed. Compilation times without this legacy code might be slightly faster.
- Fixed a bug with insertion via iterators dereferencing to rvalues (ticket #9665).
- Made Boost.MultiIndex compatible with BOOST_BIND_NO_PLACEHOLDERS (ticket #9798).
- Maintenance fixes.
Multiprecision:
- Change floating point to rational conversions to be implicit, see 10082.
- Fix definition of checked_cpp_rational typedef.
- Fix bug in assignment from string in cpp_int, see 9936.
- Added new cpp_bin_float backend for binary floating point.
- Fix bug in assignment from string in cpp_int, see 9936.
- Added MSVC-specific #include for compiler intrinsics, see 9336.
- Fixed various typos in docs, see 9432.
- Fixed gmp_rational to allow move-copy from an already copied-from object, see 9497.
- Added list of values for numeric_limits.
Odeint:
- Added algebra and operations dispatcher for automatic detection of appropriate algebras and operations.
- Added support for Eigen, Boost.Multiarray, Boost.Mpi, Boost.Compute, Blaze, and NT2.
- Changed algebra interface to use algebra.norm_inf function.
- Added iterators for iterating through the solution of the ODEs, hence an alternative to the integrate functions.
- Added the Velocity-Verlet method.
- Minor bug fixes.
Optional:
- Added support for rvalue references. Now optional<T> works with moveable but non-copyable T's.
- Improved swap (now uses move operations).
- Added function emplace(). This is the last of the requests from #1841.
- optional is moveable, including conditional noexcept specifications, which make it move_if_noexcept-friendly.
- Using explicit operator bool() on platforms that support it (#4227) (breaking change).
- Forward declaration of operator<<(ostream&, optional const&) to prevent inadvertent incorrect serialization of optional objects.
- Removed depprecated function reset() from examples (#9005).
- Equality comparison with boost::none does not require that T be EqualityComparable.
- Optional rvalue references are explicitly disallowed.
- Binding temporaries to optional references is explicitly disallowed (breaking change).
- More ways to access the contained value, functions value(), value_or(), value_or_eval().
- Updated and reorganized documentation, added tutorial and quick guide sections.
Predef:
- Addition of BOOST_PLAT_* platform definitions for MinGW and Windows platform variants.
- Detection of ARM architecture for Windows compilers to target mobile devices of Windows 8.
- Improved ARM detection for 64 bit ARM.
- Added detection of iOS as an operating system.
- Improved detection of endianess on some platforms.
- Addition of exclusive plus emulated definitions for platform and compiler detection.
Preprocessor:
- When using variadic macros tuple functionality was added to match all the array functionality.
Program Options:
- Columns in the --help output are now aligned across all option groups (#6114).
- Option names with dashes are no longer truncated in error messages (#8009).
Regex:
- Breaking change: corrected behavior of basic_regex<>::mark_count() to match existing documentation, basic_regex<>::subexpression(n) changed to match, see #9227
- Fixed issue #8903.
- Fixed documentation typos from #9283.
- Fixed bug in collation code that failed if the locale generated collation strings with embedded nul's, see #9451.
- Apply patch for unusual thread usage (no statically initiallized mutexes), see #9461.
- Added better checks for invalid UTF-8 sequences, see #9473.
Smart Pointers:
- Updated the overloads of make_shared and allocate_shared of array types (T[] or T[N]) to conform to the specification in C++ standard paper N3939 and significantly reduced the spatial overhead of the internal bookkeeping structures.
- Updated the implementations of make_shared and allocate_shared for scalar types and array types, respectively, to resolve C++ standard library defect report #2070.
Thread:
- New Experimental Features:
  - #7446 Async: Add when_any.
  - #7447 Async: Add when_all.
  - #7448 Async: Add async taking a scheduler parameter.
  - #8274 Synchro: Add concurrent queue
  - #8513 Async: Add a basic thread_pool executor.
  - #8518 Synchro: Add a latch class.
  - #8516 Async: Add future/shared_future::then taking a scheduler as parameter.
  - #9058 with_lock_guard function
  - #9571 Add a dynamic executor and an executor adaptor
- Fixed Bugs:
  - #8070 prefer GetTickCount64 over GetTickCount
  - #9333 ex_scoped_thread compile fails on msvc-12.0
  - #9341 compile error scoped_thread(move semantics) intel-linux-14.0.1
  - #9366 async(Executor, ...) fails to compile with msvc-10,11,12
  - #9402 test_excutor regression on msvc-10,11,12
  - #9404 ex_make_future regression error
  - #9471 Synchronization documentation nits
  - #9535 Missing exception safety might result in crash
  - #9618 try_join_for problem: program is not terminate.
  - #9625 Please rewrite boost::thread::~thread() reference section
  - #9632 public method start_thread in boost::thread class
  - #9673 thread compilation with MingW/gcc on Windows gives errors
  - #9708 boost::condition_variable::timed_wait unexpectedly wakes up while should wait infinite
  - #9711 future continuation called twice
  - #9867 Remove references to gcc-mingw
  - #10008 Boost Synchronization documentation typos (futures)
  - #10058 Null pointer access in once
  - #10125 call_once: compile errors in variadic version with rvalue reference emulation
  - #10126 call_once: deprecate (Function, once_flag&) overload
  - #10147 pthread_delay_np() parameters different on AIX even with gcc
  - #10155 thread::physical_concurrency() always returns 0 on PowerPC
  - #10184 Future: multiply defined symbols
TR1:
- This library is now deprecated.
TTI:
- Ticket #9441: Added better support for Sun Solaris Studio C++ compiler.
- Ticket #9444: Handle all situations where the enclosing class is not a class type.
Unordered:
- Minor documentation and warning fixes (#9377, #9719).
- Always use prime number of buckets for integers. Fixes performance regression when inserting consecutive integers (#9282).
- Only construct elements using allocators, as specified in C++11 standard.
Utility:
- Some components were moved to the new Boost.Core library.
- empty_deleter is deprecated in favor of null_deleter from Boost.Core. empty_deleter is an alias for null_deleter, it will be removed in future releases.
- base_from_member utility now supports lvalue reference member types. (#7577)
UUID:
- Added basic support for C++11 features.
- Implemented SSE-optimized versions of some functions of uuid, including comparison operators and swap. The support for different versions of SSE is automatically detected at compile time for most compilers, but can also be explicitly enabled or disabled with configuration macros. (#8509)
- Silenced some compiler warnings. (#8495, #8697)
Variant:
- Breaking change: Variant now uses variadic templates if they are supported by compiler. This leads to smaller binaries and better compilation times but in some cases may break metaprogramming functions, especially if BOOST_VARIANT_ENUM_PARAMS and BOOST_VARIANT_ENUM_SHIFTED_PARAMS are not used. Usage of variadic templates may be disabled.
- Added polymorphic_get function #9479.
- Move-only classes now can be returned by visitors.
- Optimized variant::swap() and fixed ambiguity in move_swap #2839.
- Added conditional noexcepts to move assignments, default and move constructors making boost::variant move_if_noexcept-friendly (#7911).
- Exceptions are now visible across modules even with -fvisibility=hidden flags.
- Dropped support of antique compilers.
- Fixed some warnings (#3020).

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.4, 3.3, 3.2, 3.1, 3.0
- Clang, C++98: 3.3.16
- Clang, C++11, libc++: 3.4.2
- Clang, C++1y: 3.3.16
- GCC: 4.8.2, 4.8.1, 4.7.3, 4.6.4, 4.4.7
- GCC, C++98: 4.9.0
- GCC, C++11: 4.8.2
- GCC, C++1y: 4.9.0
- Intel: 13.1
OS X:
- Apple Clang: 5.1
- Apple Clang, C++11: 5.1
- GCC: 4.2.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.9.0, 4.8.2, 4.7.3, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 12.0, 11.0, 10.0, 9.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC: 4.4.2

Boost's additional test compilers include:

Linux:
- Clang: 3.4, 3.3, 3.2, 3.1, 3.0
- Clang, C++98: 3.3.16
- Clang, C++11, libc++: 3.4.2
- Clang, C++1y: 3.3.16
- Clang, C++14, libc++: trunk
- GCC: 4.8.2, 4.8.1, 4.7.3, 4.6.4, 4.4.7
- GCC, C++98: 4.9.0
- GCC, C++11: 4.9.0, 4.8.2
- GCC, C++1y: 4.9.0
- Intel: 13.1, 13.0, 12.1, 11.1
OS X:
- Apple Clang: 5.1
- Apple Clang, C++11:
- Clang: trunk
- Clang, C++11: trunk
- GCC: 4.2.1
- Intel: 12.0
Windows:
- GCC, mingw: 4.9.0, 4.8.2, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 12.0, 11.0, 10.0, 9.0
FreeBSD:
- GCC: 4.2.1
QNX:
- QCC, ARM: 4.4.2
- QCC, x86: 4.4.2

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.55.0

Mon, 11 Nov 2013 11:50:20 -0800

Other Downloads

Windows binaries
PDF documentation (only for BoostBook based documentation).

News

Support was removed from Config for some very old versions of compilers. The new minimum requirements are:

Digitial Mars 8.41
GCC 3.3
Intel 6.0
Visual C++ 7.1

Note: This is just the mininimum requirements for Config. Some Boost libraries may have higher mininimum requirements and not support all platforms or compilers.

Other compilers are currently unchanged, but we are considering removing support for some other old compilers. Candidates for removal are:

Metroworks C++ (i.e. codewarrior)
SunPro 5.7 and earlier
Borland C++ Builder 2006 (5.82) and earlier

If you're using any of these, please let us know on the mailing lists. We will take into account any feedback received before making a decision.

Known Bugs with Visual Studio 2013/Visual C++ 12

Visual Studio 2013 was released quite late in the release process, so there exist several unresolved issues. These include:

Serialization can't compile because of a missing include.
Using has_member_function_callable_with from Boost.Container's allocator_traits causes a compile error (#9332).
In libraries such as Unordered and MultiIndex, calling overloaded functions with initializer lists can result in a compile error, with Visual C++ claiming that the overloads are ambiguous. This is a Visual C++ bug and it isn't clear if there's a good workaround. This won't affect code that doesn't use initializer lists, or uses an initializer list that doesn't require an implicit conversion (i.e. an initializer list of the container's exact value type).
Thread: ex_scoped_thread compile fails (#9333).

Patches

Log patch: fixes incorrect output of the dump manipulator, when used on AVX2-enabled CPU (e.g. Intel Haswell).

New Libraries

Predef: This library defines a set of compiler, architecture, operating system, library, and other version numbers from the information it can gather of C, C++, Objective C, and Objective C++ predefined macros or those defined in generally available headers, from Rene Rivera.

Updated Libraries

Accumulators:
- #7915 Fix silly typos.
- #8850 Fix MSVC warnings.
- #8262 Rename average to fdiv.
Any:
- boost::bad_any_cast exception is now visible across modules #8751.
- Added clear() member function.
- Added missing BOOST_NOEXCEPT.
- Fixed issue with const rvalues #9215.
Asio:
- Implemented a limited port to Windows Runtime. This support requires that the language extensions be enabled. Due to the restricted facilities exposed by the Windows Runtime API, the port also comes with the following caveats:
 - The core facilities such as the io_service, strand, buffers, composed operations, timers, etc., should all work as normal.
 - For sockets, only client-side TCP is supported.
 - Explicit binding of a client-side TCP socket is not supported.
 - The cancel() function is not supported for sockets. Asynchronous operations may only be cancelled by closing the socket.
 - Operations that use null_buffers are not supported.
 - Only tcp::no_delay and socket_base::keep_alive options are supported.
 - Resolvers do not support service names, only numbers. I.e. you must use "80" rather than "http".
 - Most resolver query flags have no effect.
- Fixed a regression (introduced in Boost 1.54) where, on some platforms, errors from async_connect were not correctly propagated through to the completion handler (#8795).
- Fixed a Windows-specific regression (introduced in Boost 1.54) that occurs when multiple threads are running an io_service. When the bug occurs, the result of an asynchronous operation (error and bytes transferred) is incorrectly discarded and zero values used instead. For TCP sockets this results in spurious end-of-file notifications (#8933).
- Fixed a bug in handler tracking, where it was not correctly printing out some handler IDs (#8808).
- Fixed the comparison used to test for successful synchronous accept operations so that it works correctly with unsigned socket descriptors (#8752).
- Ensured the signal number is correctly passed to the completion handler when starting an async_wait on a signal that is already raised (#8738).
- Suppressed a g++ 4.8+ warning about unused typedefs (#8980).
- Enabled the move optimisation for handlers that use the default invocation hook (#8624).
- Clarified that programs must not issue overlapping async_write_at operations (#8669).
- Changed the Windows HANDLE backend to treat ERROR_MORE_DATA as a non-fatal error when returned by GetOverlappedResult for a synchronous read (#8722).
- Visual C++ language extensions use generic as a keyword. Added a workaround that renames the namespace to cpp_generic when those language extensions are in effect.
- Fixed some asynchronous operations that missed out on getting async_result support in Boost 1.54. In particular, the buffered stream templates have been updated so that they adhere to current handler patterns (#9000, #9001).
- Enabled move support for Microsoft Visual Studio 2012 (#8959).
- Added use_future support for Microsoft Visual Studio 2012.
- Removed a use of std::min in the Windows IOCP backend to avoid a dependency on the <algorithm> header (#8758).
- Eliminated some unnecessary handler copies.
- Fixed various minor and cosmetic issues in code and documentation (including #8347, #8950, #8953, #8965, #8997).
Atomic:
- Added support for 64-bit atomic operations on x86 target for GCC, MSVC and compatible compilers. The support is enabled when it is known at compile time that the target CPU supports required instructions.
- Added support for 128-bit atomic operations on x86-64 target for GCC and compatible compilers. The support is enabled when it is known at compile time that the target CPU supports required instructions. The support can be tested for with the new BOOST_ATOMIC_INT128_LOCK_FREE macro.
- Added a more efficient implementation of atomic<> based on GCC __atomic* intrinsics available since GCC 4.7.
- Added support for more ARM v7 CPUs, improved detection of Thumb 2.
- Added support for x32 (i.e. 64-bit x86 with 32-bit pointers) target on GCC and compatible compilers.
- Removed dependency on Boost.Thread.
- Internal lock pool now includes proper padding and alignment to avoid false sharing.
- Fixed compilation with Intel compiler on Windows. Removed internal macro duplication when compiled on Windows.
- Some code refactoring to use C++11 features when available.
Chrono:
- Fixed Bugs:
  - #7868 chrono_io parses time incorrectly (1.53 and 1.52)
  - #9028 Typo in boost/chrono/stopwatches/formatters/base_formatter.hpp
  - #9147 uninitialized std::tm
Circular Buffer:
- Added support for rvalue references and rvalue references emulation using Boost.Move. Values are moved only if value type has noexcept move constructor and noexcept move assignment operator #7888. Now Circular Buffer is usable with move-only types.
- Much better documentation.
- #5362 circular_buffer does not compile with BOOST_NO_EXCEPTIONS.
- #7025 circular buffer reports warning: " type qualifiers ignored on function return type" while compile.
- #7950 Eliminate W4-warnings under VS2005 - warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used.
Config:
- Breaking change: Removed support for some older compilers. The new minimum compiler versions are:
  - Digitial Mars 8.41
  - GCC 3.3
  - Intel 6.0
  - Visual C++ 7.1
  Other compilers are unchanged.
Container:
- Implemented SCARY iterators.
- Fixed bugs #8269, #8473, #8892, #9009, #9064, #9092, #9108.
Context:
- #8650 SSE2 intrinsics
Coroutine:
- New interface (unidirectional data transfer).
- #8782 no best alternative
- #8801 auto-linking
Filesystem:
- Fixed Android compilation #8706.
Fusion:
- #8759 specialization of convert_impl for map_tag
Geometry:
- Additional functionality
  - Added centroid for segment type
  - Added intersects() and disjoints() for Segment-Box and Linestring-Box
  - Added rtree creation using packing algorithm
  - Added contains() and covers() spatial query predicates
  - Added iterative queries
- Bugfixes
  - In some cases .back() or .clear() was called, violating the usage of Concepts. Fixed for the reported cases
- Solved tickets
  - 6958 Intersection generates self-intersection. Caused by spike, fixed
  - 8364 Invalid input exception, caused by spikes in previous steps, fixed
  - 8365 Invalid input exception, caused by spikes in previous steps, fixed
  - 8969 boost::geometry::model::point single argument constructor should be explicit
  - 8825 Patch adding member variable documentation to doxygen_xml2qbk
  - 8652 Intersection fails for triangle-triangle intersection. Caused by spike, fixed
  - 9047 Boost files that include themselves (strategies/intersection.hpp), fixed
Graph:
- void is no longer allowed as a bundled property type (for example, in the VertexProperties template parameters to graph types); it did not work reliably before, but a static assertion now forbids it entirely. Use boost::no_property instead.
- Added support for finish_edge visitor event point in depth-first search; the change should be backward-compatible with visitors that do not have that member function.
- Disabled building of tests on Sun compiler.
- Multiple source vertices are supported in non-named-parameter versions of breadth_first_visit, breadth_first_search, dijkstra_shortest_paths, and dijkstra_shortest_paths_no_init. This feature is not yet documented; to use it, replace the single parameter for the source vertex in each of these functions by two input iterators of the same type containing the source vertices to use.
- Added Hawick circuits algorithm; contributed by Louis Dionne.
- Added edge coloring algorithm; contributed by Maciej Piechotka.
- Added min-cost max-flow algorithm; contributed by Piotr Wygocki.
- Bugs and feature requests from Trac fixed: #5269, #8317, #8433, #8791, #8877, #8986, #9012, #9080.
Hash:
- Simplify a SFINAE check so that it will hopefully work on Sun 5.9 (#8822).
- Suppress Visual C++ infinite loop warning (#8568).
Interprocess:
- Fixed bugs #7156, #7164, #8277, #8976, #9065, #9073, #9008.
Intrusive:
- Source breaking: Deprecated xxx_dont_splay functions from splay containers. Deprecated splay_set_hook from splay containers, use bs_set_hook instead. Both will be removed in Boost 1.56.
- ABI breaking: Hash containers' end iterator was implemented pointing to one-past the end of the bucket array (see #8698) causing severe bugs when values to be inserted where allocated next to the bucket array. End iterator implementation was changed to point to the beginning of the bucket array.
- Big refactoring in order to reduce template and debug symbol bloat. Test object files have been slashed to half in MSVC compilers in Debug mode. Toolchains without Identical COMDAT Folding (ICF) should notice size improvements.
- Implemented SCARY iterators.
Lexical cast:
- std::bad_alloc exceptions are now are not converted to boost::bad_lexical_cast #8966.
- Added static assert that checks for std::numeric_limits specializations if they are required for conversion. Use BOOST_HAS_INT128 for detecting 128 bit integers support #8790.
- Documentation improved and more usage examples added.
Log:
- General changes:
  - Added a new configuration macro BOOST_LOG_WITHOUT_DEFAULT_FACTORIES. By defining this macro the user can disable compilation of the default filter and formatter factories used by settings parsers. This can substantially reduce binary sizes while still retaining support for settings parsers.
  - Rewritten some of the parsers to reduce the compiled binary size. The rewritten parsers are more robust in detecting ambiguous and incorrect input.
  - The following headers are deprecated: boost/log/utility/intrusive_ref_counter.hpp, boost/log/utility/explicit_operator_bool.hpp, boost/log/utility/empty_deleter.hpp. These headers will be removed in future releases. The contents of these headers were moved to other libraries.
- Bug fixes:
  - Fixed timer attribute generating incorrect time readings on Windows on heavy thread contention when QueryPerformanceCounter API was used.
  - Fixed a bug in the filter parser that prevented using parsed filters with some attributes.
  - Fixed thread id formatting discrepancies between the default sink and formatters.
  - Closed tickets: #8815, #8819, #8915, #8917, #9139, #9140, #9153, #9155.
- See changelog for more details.
Math:
- Suppress numerous warnings (mostly from GCC-4.8 and MSVC) #8384, #8855, #9107, #9109..
- Fixed PGI compilation issue #8333.
- Fixed PGI constant value initialization issue that caused erf to generate incorrect results #8621.
- Prevent macro expansion of some C99 macros that are also C++ functions #8732 and #8733..
- Fixed Student's T distribution to behave correctly with huge degrees of freedom (larger than the largest representable integer) #8837.
- Make some core functions usable with long double even when the platform has no standard library long double support #8940.
- Fix error handling of distributions to catch invalid scale and location parameters when the random variable is infinite #9042 and #9126.
- Add workaround for broken <tuple> in Intel C++ 14 #9087.
- Improve consistency of argument reduction in the elliptic integrals #9104.
- Fix bug in inverse incomplete beta that results in cancellation errors when the beta function is really an arcsine or Student's T distribution.
- Fix issue in Bessel I and K function continued fractions that causes spurious over/underflow.
- Add improvement to non-central chi squared distribution quantile due to Thomas Luu.
Move:
- Fixed bugs #7952, #8764, #8765, #8842, #8979.
Meta State Machine:
- New feature: interrupt states now support a sequence of events to end the interruption.
- Fixed Trac #8686.
Multiprecision:
- Added support for Boost.Serialization.
- Suppressed some GCC warnings. See 8872.
- Fixed bug in pow for large integer arguments. See 8809.
- Fixed bug in pow for calculation of 0[super N]. See 8798.
- Fixed bug in fixed precision cpp_int IO code that causes conversion to string to fail when the bit count is very small (less than CHAR_BIT). See 8745.
- Fixed bug in cpp_int that causes left shift to fail when a fixed precision type would overflow. See 8741.
- Fixed some cosmetic warnings from cpp_int. See 8748.
- Fixed calls to functions which are required to be macros in C99. See 8732.
- Fixed bug that causes construction from INT_MIN, LONG_MIN etc to fail in cpp_int. See 8711.
Multi-index Containers:
- Boost.MultiIndex has been brought to a higher level of compliance with C++11.
 - multi_index_container is now efficiently movable.
 - Initializer lists supported.
 - Emplace functions provided.
 - Non-copyable elements (such as std::unique_ptr<T>) supported. This includes insertion of a range [first,last) where the iterators point to a type that is convertible to that of the element: no copy construction happens in the process.
 - Random access indices provide shrink_to_fit().
 Refer to the compiler specifics section for limitations on pre-C++11 compilers.
- The following classes are deprecated:
- Maintenance fixes.
MPI:
- Replaced calls to deprecated MPI functions
- Added support for multi-threaded initialization
- Added in-place collectives
Phoenix:
- #9049 phoenix::function constructor is constexpr.
Polygon:
- Updated CGAL part of the Voronoi benchmark with patches from Sebastien Loriot. Updated documentation.
- Added polygon decomposition capability to polygon_90_set_data container (patch from Intel). Updated documentation.
- Bugs fixed from Trac: #8197.
PropertyMap:
- dynamic_properties objects can now be built by non-destructively chaining .property(name, pm) calls. Example:
```
boost::dynamic_properties()
 .property("color", color_map)
 .property("pos", position_map)
```
- The use of raw pointers as property maps is deprecated; it often failed on Visual Studio in the past. This usage has been removed from all tests and examples in Boost.Graph. The replacement to use for vertex properties in graphs (the most common use for this feature) is:
```
boost::make_iterator_property_map(
 <pointer or container .begin() iterator>,
 get(boost::vertex_index, <graph object>))
```
 (Note: the lack of namespace qualification on get() in this code is necessary for generic code). Outside a graph context, the closest equivalent is:
```
boost::make_iterator_property_map(
 <pointer>,
 boost::typed_identity_property_map<std::size_t>())
```
 There are commented-out static assertions on lines 151 and 159 of <boost/property_map/property_map.hpp> that can be un-commented to find deprecated uses of pointers in user code.
Rational:
- Added lowest and max_digits10, members of std::numeric_limits added in C++11, to the unit-test code. Needed since Boost.Test refers to one of them when compiled in C++11 mode.
- Changed initialization of some internal variables to something that cannot be a narrowing conversion, which fixes issue #5855. Needed since narrowing conversions are an error in C++11.
SmartPtr:
- Added boost/smart_ptr/intrusive_ref_counter.hpp header, extracted from Boost.Log. The header implements a mixin base class that adds support for intrusive_ptr to user's classes.
Thread:
- New Features:
 - #8519 Synchro: Update class barrier with a completion function.
 - #8515 Async: Add shared_future::then.
 - #8519 Synchro: Update class barrier with a completion function
 - #8615 Async: Replace make_future/make_shared_future by make_ready_future.
 - #8627 Async: Add future<>::unwrap and unwrapping constructor.
 - #8677 Async: Add future<>::get_or.
 - #8678 Async: Add future<>::fallback_to.
 - #8891 upgrade_to_unique_lock: missing mutex() function.
 - #8955 Request for more efficient way to get exception_ptr from future.
- Fixed Bugs:
 - #7461 detail::win32::ReleaseSemaphore may be called with count_to_release equal to 0
 - #8070 prefer GetTickCount64 over GetTickCount
 - #8768 win32 condition_variable::wait_until infinite wait in rare cases.
 - #8817 Boost Thread Windows CE _createthreadex handling breaks mingw w64.
 - #8943 Failed to compile code using boost::call_once with Intel C++ Composer XE 2013 on Windows.
 - #8931 Typos in external_locking reference.
 - #9029 Misprint in documentation.
 - #9037 gcc -Wshadow gives warnings in condition_variable{,_fwd}.hpp.
 - #9041 Boost.Thread DSO's may need to link with Boost.Atomic.
 - #9048 boost::scoped_thread useless ctor with variadic template arguments.
 - #9079 Condition variable will wait forever for some timepoint values (Win).
Timer:
- Fixed compilation on Intel compiler #8956.
Type Traits:
- Added is_copy_contructible trait #8802.
Unordered:
- Avoid some warnings (#8851, #8874).
- Avoid exposing some detail functions via. ADL on the iterators.
- Work around variadic parameter bug in Visual Studio 2013. The compiler still has problems with initializer lists, but it might not be possible to work around those.
Utility:
- boost::result_of can be set to use TR1 protocol by default and fall back to decltype if the function object does not support it (like C++11 lambda functions, for example). Define BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK configuration macro to enable this mode.
- Improved support for C++11 in the boost::base_from_member class template. The class implements perfect forwarding for the constructor arguments, if the compiler supports rvalue references, variadic templates and function template default arguments.
- Added boost/utility/explicit_operator_bool.hpp and boost/utility/empty_deleter.hpp headers, which were extracted from Boost.Log. The headers implement utilities for defining explicit conversion operators to bool and a deleter function object that does nothing, respectively.
Variant:
- Fixed compilation of constructor and assignment operator with const rvalues input parameters #8988.
- Fixed compilation of move assignment operator for situations when one of the variant template classes has nothrow copy constructor and throwing move constructor #8772.
- Fix compilation on exception-disabled environments #8717.
- Fix unreachable code warnings #8665.
- Removed duplicate code #7601.
Wave:
- See the Changelog for details.
xpressive:
- #8843 throw instead of assert at incomplete charset
- #8880 remove unused local typedef
- #8882 use RAII instead of try/catch in sequence_stack.hpp
- #8474 make xpressive play nice with clang's -Wimplicit-fallthrough diagnostic

Updated Tools

Quickbook:
- Quickbook 1.6 finalized, see the Quickbook documentation for details.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Clang: 3.3, 3.2, 3.1, 3.0
- Clang, C++11, libc++: 3.4, 3.3
- GCC: 4.8.1, 4.7.3, 4.6.3, 4.5.3, 4.4.7
- GCC, C++11: 4.8.1
- GCC, C++98: 4.8.1
OS X:
- GCC: 4.2
- Apple Clang: 5.0
- Apple Clang, C++11: 5.0
Windows:
- GCC, mingw: 4.8.0, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 11.0, 10.0, 9.0

Boost's additional test compilers include:

OS X:
- Apple Clang: 5.0
- Apple Clang, C++11: 5.0
- Clang: trunk
- Clang, C++11: trunk
- GCC: 4.2.1
Linux:
- Clang: 3.3, 3.2, 3.1, 3.0, trunk
- Clang, C++11: 3.4
- Clang, C++11, libc++: 3.4, 3.3
- GCC: 4.9.0 (experimental), 4.8.1, 4.7.3, 4.6.4, 4.5.3, 4.4.7
- GCC, C++11: 4.8.1
- GCC, C++98: 4.8.1
- Intel: 13.0.1, 12.1.6
Windows:
- GCC, mingw: 4.8.0, 4.7.2, 4.6.3, 4.5.4, 4.4.7
- Visual C++: 11.0, 10.0, 9.0

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.54.0

Mon, 1 Jul 2013 10:10:02 -0700

Patches

These are patches from library authors which were found too late to be fixed in the 1.54.0 release. Be careful as they have not been through the normal testing process.

News

Supported CPUs

Boost no longer supports the 80386 target CPU, the minimum x86 32-bit target is i486. The 80386 target was not properly supported by Boost.SmartPtr and Boost.Atomic (as well as the libraries that used them internally) even before this release. Some Boost libraries may have higher requirements on the minimum target CPU (like Boost.Log for example), see the respective library documentation for details.

Also by default, when building Boost for x86 32-bit targets it will compile for i686 (Pentium Pro) and later CPUs. This can be changed by specifying the instruction-set property in b2 or bjam command line, for example:

b2 variant=release architecture=x86 instruction-set=i486 stage

Possible values for the instruction-set are:

Target for the host CPU: native
Generic x86 CPUs: i486, i586, i686
Intel CPUs: pentium, pentium-mmx, pentiumpro, pentium2, pentium3, pentium3m, pentium-m, pentium4, pentium4m, prescott, nocona, core2, corei7, corei7-avx, core-avx-i, conroe, conroe-xe, conroe-l, allendale, merom, merom-xe, kentsfield, kentsfield-xe, penryn, wolfdale, yorksfield, nehalem, sandy-bridge, ivy-bridge, haswell, atom
AMD CPUs: k6, k6-2, k6-3, athlon, athlon-tbird, athlon-4, athlon-xp, athlon-mp, k8, opteron, athlon64, athlon-fx, k8-sse3, opteron-sse3, athlon64-sse3, amdfam10, barcelona, bdver1, bdver2, bdver3, btver1, btver2
VIA CPUs: c3, c3-2
IDT CPUs: winchip-c6, winchip2

Note that not all these values may be supported by a particular compiler.

Signals deprecated

Boost.Signals is no longer being actively maintained, so it has been deprecated. Do not use Boost.Signals for new development (use Boost.Signals2 instead). If you have existing Boost.Signals-based code, it will continue to work, but consider moving to Boost.Signals2. There is a porting guide in the Signals2 documentation.

New Libraries

Log: Logging library, from Andrey Semashev.
TTI: Type Traits Introspection library, from Edward Diener.
Type Erasure: Runtime polymorphism based on concepts.

Updated Libraries

Accumulators:
- Fixes comment typos (#7917)
- Silence unused variable warnings (#6926)
Algorithm:
- The return types for copy_while and copy_until have been changed. This is an interface change. If you were using the return values from these functions, then you will have to modify your code. Instead of just returning the modified OutputIterator, these functions now return a std::pair<InputIterator, OutputIterator>. If this change affects your code, the simplest change is to add a .second to the end of the call, which will get you the same behavior that you had before.
- Added C++14 versions of 'is_permutation', 'equal' and 'mismatch'.
Any:
- Added C++11 features support #6999:
  - Move assignment and move constructors.
  - Added noexcept modifiers.
Asio:
- Added new traits classes, handler_type and async_result, that allow the customisation of the return type of an initiating function.
- Added the asio::spawn() function, a high-level wrapper for running stackful coroutines, based on the Boost.Coroutine library. The spawn() function enables programs to implement asynchronous logic in a synchronous manner. For example: size_t n = my_socket.async_read_some(my_buffer, yield);.
- Added the asio::use_future special value, which provides first-class support for returning a C++11 std::future from an asynchronous operation's initiating function. For example: future<size_t> n = my_socket.async_read_some(my_buffer, asio::use_future);.
- Promoted the stackless coroutine class and macros to be part of Asio's documented interface, rather than part of the HTTP server 4 example.
- Added a new handler hook called asio_handler_is_continuation. Asynchronous operations may represent a continuation of the asynchronous control flow associated with the current executing handler. The asio_handler_is_continuation hook can be customised to return true if this is the case, and Asio's implementation can use this knowledge to optimise scheduling of the new handler. To cover common cases, Asio customises the hook for strands, spawn() and composed asynchronous operations.
- Added four new generic protocol classes, generic::datagram_protocol, generic::raw_protocol, generic::seq_packet_protocol and generic::stream_protocol, which implement the Protocol type requirements, but allow the user to specify the address family (e.g. AF_INET) and protocol type (e.g. IPPROTO_TCP) at runtime.
- Added C++11 move constructors that allow the conversion of a socket (or acceptor) into a more generic type. For example, an ip::tcp::socket can be converted into a generic::stream_protocol::socket via move construction.
- Extended the basic_socket_acceptor<> class's accept() and async_accept() functions to allow a new connection to be accepted directly into a socket of a more generic type. For example, an ip::tcp::acceptor can be used to accept into a generic::stream_protocol::socket object.
- Moved existing examples into a C++03-specific directory, and added a new directory for C++11-specific examples. A limited subset of the C++03 examples have been converted to their C++11 equivalents.
- Various SSL enhancements. Thanks go to Nick Jones, on whose work these changes are based.
 - Added support for SSL handshakes with re-use of data already read from the wire. New overloads of the ssl::stream<> class's handshake() and async_handshake() functions have been added. These accept a ConstBufferSequence to be used as initial input to the ssl engine for the handshake procedure.
 - Added support for creation of TLSv1.1 and TLSv1.2 ssl::context objects.
 - Added a set_verify_depth() function to the ssl::context and ssl::stream<> classes.
 - Added the ability to load SSL certificate and key data from memory buffers. New functions, add_certificate_authority(), use_certificate(), use_certificate_chain(), use_private_key(), use_rsa_private_key() and use_tmp_dh(), have been added to the ssl::context class.
 - Changed ssl::context to automatically disable SSL compression by default. To enable, use the new ssl::context::clear_options() function, as in my_context.clear_options(ssl::context::no_compression).
- Fixed a potential deadlock in signal_set implementation.
- Fixed an error in acceptor example in documentation #8421.
- Fixed copy-paste errors in waitable timer documentation #8602.
- Added assertions to satisfy some code analysis tools #7739.
- Fixed a malformed #warning directive #7939.
- Fixed a potential data race in the Linux epoll implementation.
- Fixed a Windows-specific bug, where certain operations might generate an error_code with an invalid (i.e. NULL) error_category #8613.
- Fixed basic_waitable_timer's underlying implementation so that it can handle any time_point value without overflowing the intermediate duration objects.
- Fixed a problem with lost thread wakeups that can occur when making concurrent calls to run() and poll() on the same io_service object #8354.
- Fixed implementation of asynchronous connect operation so that it can cope with spurious readiness notifications from the reactor #7961.
Chrono:
- Fixed Bugs:
  - #8079 Chrono memory leak
  - #8318 BOOST_FORCEINLINE constructors of time_point and duration
  - #8367 chrono does not compile with clang from XCode 4.5.2 with -std=c++11 -stdlib=libc++ and -arch armv7
  - #8370 typo in chrono reference
  - #8435 Can't compile Chrono on HP-UX due to no CLOCK_REALTIME macro.
Circular Buffer:
- Fixed warnings (#8032).
Container:
- Added experimental static_vector class, based on Andrew Hundt's and Adam Wulkiewicz's high-performance varray class.
- Speed improvements in vector constructors/copy/move/swap, dispatching to memcpy when possible.
- Support for BOOST_NO_EXCEPTIONS #7227.
- Fixed bugs #7921, #7969, #8118, #8294, #8553.
Context:
- Support for SPARC architecture added.
Coroutine:
- Support for segmented stacks (stack grows on demand) added.
- #7805 Typo
- #7972 GCC warnings
- #7988 C++11 range-for
- #8023 Using iterator traits
- #8024 Create const_iterator
- #8101 Postfix operator++ for iterator
- #8526 memory leak
- #8544 calling managed DLL
Geometry:
- Additional functionality
  - added Spatial Index, developed for Boost.Geometry by Adam Wulkiewicz. The spatial index was originally started by Federico J. Fernandez during the Google Summer of Code 2008 program, mentored by Hartmut Kaiser.
  - added SVG-output, this was already in extensions for several years
- Documentation
  - small fixes of missing words
- Bugfixes
  - collinear opposite segments did sometimes (in circles) have a robustness issue, fixed
  - fixed insertion of false intersection point (found by buffer)
  - applied patch of Vladimir Petrovic for debugging traversals
- Solved tickets
  - 7462 degenerate union result for float, fixed
  - 7465 wrong construtors access type in scale_transformer class, fixed
  - 7802 cart_intersect.hpp unused parameter warnings, fixed
  - 8254 faulty intersection, fixed
  - 8393 polygon model doesn't adhere to stated Polygon concept rules, doc updated.
  - 8403 silenced compiler warning C4127: conditional expression is constant
  - 8405 silenced compiler warning C4189: '...' : local variable is initialized but not referenced
- Internal changes
  - Made several algorithms variant-aware (append, area, clear, convert, equals, length, num_points)
Graph:
- Bugs fixed from Trac: #6780, #7016, #7155, #7845, #7863, #7877, #8166, #8192, #8398, #8411, #8427, #8428, #8434, #8490, #8681.
- Added updates to VF2 subgraph isomorphism from Jakob Lykke Andersen and Flavio De Lorenzi.
- Added maximum adjacency search from Fernando Vilas.
- Added timeout support from Brammert Ottens to resource-constrained shortest paths (r_c_shortest_paths) algorithm.
- Various fixes to documentation and examples and removal of outdated compiler workarounds.
Interprocess:
- Added support for platform-specific flags to mapped_region (ticket #8030)
- Fixed bugs #7484, #7598, #7682, #7923, #7924, #7928, #7936, #8521, #8595.
- ABI breaking: Changed bootstamp function in Windows to use EventLog service start time as system bootup time. Previously used LastBootupTime from WMI was unstable with time synchronization and hibernation and unusable in practice. If you really need to obtain pre Boost 1.54 behaviour define BOOST_INTERPROCESS_BOOTSTAMP_IS_LASTBOOTUPTIME from command line or detail/workaround.hpp.
Intrusive:
- Added BOOST_NO_EXCEPTIONS support (bug #7849).
Iostreams:
- tee now works correctly for std::streams (#8315).
- Documentation fixes (#8385, #8460).
- Avoid warning from Clang's -Wimplicit-fallthrough (#8482).
Lexical cast:
- Converting to character pointer now triggers compile time assert instead of runtime #8334.
- Lexical cast is now capable of converting boost::int128_type and boost::uint128_type #7909.
- Changed internal stream buffer handling, now works with libc++ #8267, #7704.
- Restored getting address of lexical_cast function that was broken in 1.53.0 #7421.
- Fixed warnings, internals and tests #2558, #7949, #8162, #8369, #8547.
Math:
- Major reorganization to incorporate other Boost.Math like Integer Utilities (Greatest Common Divisor and Least Common Multiple), quaternions and octonions. Making new chapter headings.
- Added many references to Boost.Multiprecision and cpp_dec_float_50 as an example of a User-defined Type (UDT).
- Added Clang to list of supported compilers.
- Fixed constants to use a thread-safe cache of computed values when used at arbitrary precision.
- Added finding zeros of Bessel functions cyl_bessel_j_zero, cyl_neumann_zero, airy_ai_zeros and airy_bi_zeros(by Christopher Kormanyos).
- More accuracy improvements to the Bessel J and Y functions from Rocco Romeo.
- Fixed nasty cyclic dependency bug that caused some headers to not compile #7999.
- Fixed bug in __tgamma that caused spurious overflow for arguments between 142.5 and 143.
- Fixed bug in raise_rounding_error that caused it to return an incorrect result when throwing an exception is turned off #7905.
- Added minimal __float128 support.
- Fixed bug in edge-cases of poisson quantile #8308.
- Adjusted heuristics used in Halley iteration to cope with inverting the incomplete beta in tricky regions where the derivative is flatlining. Example is computing the quantile of the Fisher F distribution for probabilities smaller than machine epsilon. See ticket #8314.
Meta State Machine:
- Bugfix: Exit points broken for the favor_compile_time policy.
- Bugfix: copy breaks exit points of subsubmachines.
- Bugfix: #8046
Move:
- Fixed bugs #7969), #8231).
Multiprecision:
- Breaking change renamed rational_adapter to rational_adaptor.
- Add support for MPFI.
- Add logged_adaptor.
- Add support for 128-bit floats via GCC's __float128 or Intel's _Quad data types.
- Add support for user-defined literals in cpp_int, improve constexpr support.
- Fixed bug in integer division of cpp_int that results in incorrect sign of cpp_int when both arguments are small enough to fit in a double_limb_type. See 8126.
- Fixed bug in subtraction of a single limb in cpp_int that results in incorrect value when the result should have a 0 in the last limb: 8133.
- Fixed bug in cpp_int where division of 0 by something doesn't get zero in the result: 8160.
- Fixed bug in some transcendental functions that caused incorrect return values when variables are reused, for example with a = pow(a, b). See 8326.
Polygon:
- Updates and fixes to the Voronoi documentation.
- Bugs fixed from Trac: #8026, #8197, #8257.
PropertyMap:
- Added compose_property_map from Guillaume Pinot.
Range:
- Bug fixes:
  - #6944 Some Range concepts use the incorrect Iterator concept
  - #7407 istream_range does not compile with wcin
  - #7408 istream_range should not pull istream
  - #7731 irange doesn't end iteration properly when step_size is 3 or more
  - #7827 [range] cant compile r | indexed to range algorithm
  - #8338 Iterator range does not work with pointer to array as iterator
  - #8453 Incorrect configuration macro BOOST_NO_PARTIAL_TEMPLATE_SPECIALIZATION
Signals:
- No longer actively maintained, so it is deprecated. Use Signals2 for new development.
Thread:
- New Features:
 - #7285 C++11 compliance: Allow to pass movable arguments for call_once.
 - #7445 Async: Add future<>.then
 - #7449 Synchro: Add a synchronized value class
- Fixed Bugs:
 - #4878 MinGW 4.5.0 undefined reference to bool interruptible_wait(detail::win32::handle handle_to_wait_for,detail::t imeout target_time).
 - #4882 Win32 shared_mutex does not handle timeouts correctly.
 - #5752 boost::call_once() is unreliable on some platforms
 - #6652 Boost.Thread shared_mutex.hpp:50:99: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
 - #6843 [Intel C++] Compile Errors with '#include <atomic>'
 - #6966 future boost::future_category inconsistent dll linkage
 - #7720 exception lock_error while intensive locking/unlocking of mutex
 - #7755 Thread: deadlock with shared_mutex on Windows
 - #7980 Build error: msvc-11.0 and BOOST_THREAD_DONT_USE_DATETIME
 - #7982 pthread_delay_np() parm compile error on AIX
 - #8027 thread library fails to compile with Visual Studio 2003
 - #8070 prefer GetTickCount64 over GetTickCount
 - #8136 boost::this_thread::sleep_for() sleeps longer than it should in Windows
 - #8212 Boost thread compilation error on Solaris 10
 - #8237 fix documentation for 'thread_group'
 - #8239 barrier::wait() not marked as interruption_point
 - #8323 boost::thread::try_join_for/try_join_until may block indefinitely due to a combination of problems in Boost.Thread and Boost.Chrono
 - #8337 The internal representation of "std::string(this->code()->message())" escapes, but is destroyed when it exits scope.
 - #8371 C++11 once_flag enabled when constexpr is not available
 - #8443 Header file inclusion order may cause crashes
 - #8451 Missing documented function 'boost::scoped_thread::joinable'
 - #8530 [Coverity] Unused variable thread_handle, uninitialized variable cond_mutex in thread/pthread/thread_data.hpp
 - #8596 With C++0x enabled, boost::packaged_task stores a reference to function objects, instead of a copy.
Type Traits:
- New type traits implemented #8189:
  - is_nothrow_move_constructible
  - is_nothrow_move_assignable
  - has_trivial_move_assign
  - has_trivial_move_constructor
uBLAS:
- #6511 Division by scalar should use enable_if<>
- #7297 Make the free functions 'num_columns' and 'num_rows' support the uBLAS traits system and better work with expression types
- #6010 fixed linkage problems in assignment.hpp
- updated doc
Unordered:
- Some very basic noexcept support.
Utility:
- Fix basic_string_ref::find (#8067).
- Fix string_ref's logical operators.
- Update noncopyable for C++11 (#6578).
- Fix noncopyable compiler warning when used in DLL interface (#6935).
- Fix using boost::addressof with boost::function on SolarisStudio compiler (#7079).
- Disable annoying MSVC warning about operator comma (#7663)
Variant:
- Now uses new type traits from Boost.TypeTrait to detect noexcept constructors and assignment operators #8296. This shall increase performance of boost::variant for many types in C++11.
- Multivisitation implemented #8459.
- Documentation updated to reflect C++11 features support.
Wave:
- See the Changelog for details.
xpressive:
- Remove unused variables, fixes #8039
- Avoid name clash with macro None in glx.h, fixes #8204
- Silence a gcc warning, fixes #8138

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.4.7, 4.5.3, 4.6.2, 4.6.3, 4.7.3
- GCC, C++98 mode: 4.7.3
- GCC, C++11 mode: 4.7.2, 4.7.3, 4.8.0
- Clang: 3.0, 3.1, 3.2
- Clang, C++11 mode: 3.2
OS X:
- GCC: 4.2
- Apple Clang: 4.2.1
- Apple Clang, C++11 mode: 4.2.1
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.2, 4.8.0
- Visual C++: 8.0, 9.0, 10.0, 11.0
FreeBSD:
- GCC: 4.2.1

Boost's additional test compilers include:

Linux:
- Clang: 3.0, 3.1, 3.2, from Subversion
- Clang, with libc++: 3.2
- GCC: 4.4.7, 4.5.3, 4.6.2, 4.6.3, 4.7.2, 4.7.3
- GCC, C++98 mode: 4.7.3
- GCC, C++11 mode: 4.7.3, 4.8.0
OS X:
- Apple Clang: 4.2.1
- Apple Clang, C++11 mode: 4.2.1
- Clang: from Subversion
- Clang, C++11 mode: from Subversion
- GCC: 4.2
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.2, 4.8.0
- Visual C++: 9.0, 10.0, 11.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
AIX:
- IBM XL C/C++ Enterprise Edition: 12.1.0.1
FreeBSD:
- GCC: 4.2.1

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.53.0

Mon, 4 Feb 2013 10:29:19 -0800

New Libraries

Atomic: C++11-style atomic<>, from Helge Bahmann, maintained by Tim Blechmann.
Coroutine: Coroutine library, from Oliver Kowalke.
Lockfree: Lockfree data structures, from Tim Blechmann.
Multiprecision: Extended precision arithmetic types for floating point, integer and rational arithmetic from John Maddock and Christopher Kormanyos.
Odeint: Solving ordinary differential equations, from Karsten Ahnert and Mario Mulansky.

News

This release contains a fix for ticket #7743, in Boost.Locale. For more details, see the security notice.

Updated Libraries

Algorithm:
- Fixed non-ASCII char in comment (#7781).
- Updated the Knuth-Morris-Pratt docs (#7656).
Array:
- Added support for boost::get and std::get (#7652)
Asio:
- Fixed some 64-to-32-bit conversion warnings (#7459).
- Fixed some small errors in documentation and comments (#7761).
- Fixed an error in the example embedded in basic_socket::get_option's documentation (#7562).
- Changed to use long rather than int for SSL_CTX options, to match OpenSSL (#7209).
- Changed to use _snwprintf to address a compile error due to the changed swprintf signature in recent versions of MinGW (#7373).
- Fixed a deadlock that can occur on Windows when shutting down a pool of io_service threads due to running out of work (#7552).
- Enabled the noexcept qualifier for error categories (#7797).
- Changed UNIX domain socket example to treat errors from accept as non-fatal (#7488).
- Added a small block recycling optimisation to improve default memory allocation behaviour.
Bimap:
- Refactor map_view_iterator to improve error messages.
- Fixed replace_(left/right/key/data) bug when using relations with info.
- Fixed vector_of and list_of views assign(size_type,value_type) bug.
- Fixed vector_of views operator[](size_type) and at(size_type) functions return value.
Chrono:
- Deprecated:
 - The chrono i/o version included in Boost.Chrono 1.2.x has been completly refactored in version 2.0.0
 - chrono I/O: The manipulators __duration_short, __duration_long are depreceated. You should use the parameterized form __duration_fmt or the renamed manipulators __duration_symbol and __duration_prefix instead.
 - chrono I/O: The __duration_punct<> facet is depreceated. You should use the __get_duration_style free function to get the informations and use the __duration_units facet for localization purposes.
 - When BOOST_CHRONO_VERSION==2 the preceding deprecated functions are not available.
- Fixes:
 - #7546 time_point<system_clock> output version 2 fails to compile
 - #7547 time_point<system_clock> input version 2 fails to compile
 - #7868 chrono_io parses time incorrectly (1.53 and 1.52)
Container:
- Fixed bug #7650.
- Improved vector's insertion performance.
- Changed again experimental multiallocation interface for better performance (still experimental).
- Added no exception support for those willing to disable exceptions in their compilers.
- Fixed GCC -Wshadow warnings.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
Context:
- Support for iOS on ARM and MacOS X on x86 (32bit) added.
- Support for SEH Overwrite Protection on Win32.
Geometry:
- Bugfixes
  - avoid generating output polygons with interior rings below minimum size (e.g. one or two points)
  - geometry::disjoint for degenerate segments (patched by Karsten Ahnert)
  - problem in geometry::difference for missing handling tangency, reported by H2
  - fixed geometry::for_each for use with Lambda's
  - fixed geometry::comparable_distance point-linestring (and -range, -polygon)
- Additional functionality
  - combinations for geometry::disjoint: point/ring, point/polygon, point/multi_polygon
  - combinations for geometry::intersects: point/ring, point/polygon, point/multi_polygon
- Internal changes
  - updates in specializations/not_implemented for various algorithms (as in an earlier version, these changes are still going on; they take care for simplified structs, better error reporting, and automatized documentation)
  - fixes in unit tests
GIL:
- Fixed self-assignment warnings (#4919).
Graph:
- Fixed the following bugs from Trac: #3468, #4386, #5269, #7428, #7457, #7467, #7600, #7648, #7684, #7728, #7741, #7766, #7771, #7773, #7780, #7787, #7801 plus other bugs not in Trac.
- Added support for reading from GraphML files containing multiple graphs.
- Added versions of A* search specifically for trees, removing the need for a color map when it is acceptable to visit the same vertex multiple times.
- Added VF2 subgraph isomorphism algorithm (contributed by Flavio De Lorenzi).
Hash:
- Add support for boost::int128_type and boost::uint128_type where available.
- On platforms that are known to have standard floating point functions, don't use the automatic detection (#7221, #7470).
Interprocess:
- Fixed GCC -Wshadow warnings.
- Experimental multiple allocation interface improved and changed again. Still unstable.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- ABI breaking: changed node pool allocators internals for improved efficiency.
- Fixed bug #7795.
Intrusive:
- Fixed bugs #7174, #7529, #7815.
- Fixed GCC -Wshadow warnings.
- Added missing explicit keyword in several intrusive container constructors.
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- Small documentation fixes.
Lexical cast:
- New character type detection algorithm for user defined types #6786.
- Documentation updates (#7582, #7831).
- Fixed bugs with std::array #7799.
- Fixed compilation with -ftrapv and numeric to numeric conversions #7814.
Locale:
- Security related bug fix, some invalid UTF-8 sequences where accepted as valid #7743
- Invalid Windows codepage names used #7386
- Fixed missing documentation, caused by a error in Doxygen formatting #7734
- Fixed missing std:: in some places #7701
- Spelling, grammar, typos fixes #7368, #7762
Math:
- Fixed issues #7325, #7415, #7416, #7183, #7649, #7694, #4445 and #7492.
- Fixed mistake in calculating pooled standard deviation in two-sample students t example #7402.
- Improve complex acos/asin/atan, see #7290, #7291.
- Improve accuracy in some corner cases of cyl_bessel_j and gamma_p/gamma_q thanks to suggestions from Rocco Romeo.
- Improve accuracy in Bessel J and Y with integer orders thanks to suggestions from Rocco Romeo.
MinMax:
- Fixed a misuse of the comma operator (#7752).
- Updated the docs to fix broken link (#7751).
Move:
- Better header segregation (bug #6524).
- Small documentation fixes
- Replaced deprecated BOOST_NO_XXXX with newer BOOST_NO_CXX11_XXX macros.
- Fixed #7830, #7832.
Polygon:
- Fixes:
  - #6366 Bug in boost::polygon::contains for polygon_90 type.
  - #7678 multiple definitions of bool boost::polygon::belongs(...) by multiple #include.
- Internal changes:
  - refactored point/segment/interval data/concept/traits.
  - added unit tests for point and interval data/concept/traits.
  - simplified transform.hpp to operate only in 2D.
  - removed point_3d data/concept/traits.
Random:
- Now compiles with exceptions disabled (#5399).
Range:
- Bug fixes:
  - #5603 the "range/any_range.hpp" header is not self-sufficient
  - #6103 boost::range_detail vs. boost::range::range_detail compiler error
- Documentation fixes:
  - #5160
  - #5314
  - #5440
  - #5775
  - #6212
  - #7585
  - #7843
  - #7916
  - #7926
Ratio:
- Fixes:
 - #7616 br_mul::nan - warning C4293: '<<' : shift count negative or too big, undefined behavior`.
Regex: Fixed Issues: #7744, #7644.
Smart Pointers:
- New Features:
  - Glen Fernandes provided implementations of make_shared and allocate_shared for arrays. They achieve a single allocation for an array that can be initialized with constructor arguments or initializer lists as well as overloads for default initialization and no value initialization. See the 'make_shared and allocate_shared for arrays' page for more information.
  - shared_ptr can now be used to hold a pointer to a dynamically allocated array. This is accomplished by using an array type (T[] or T[N]) as the template parameter.
  - Smart pointers now use explicit operator bool on C++11 compilers. This can break code that passes a smart pointer to a function taking a bool, or that returns a smart pointer from a function with a bool return type. Please use p != 0 or !!p in such cases.
StringAlgo:
- Fixed a bug where it wouldn't find overlapping patterns (#7784).
- Disambiguated some calls to insert (#7346).
Thread:
- Deprecated features:
 - Deprecated features since boost 1.53 will be available only until boost 1.58.
 - C++11 compliance: packaged_task<R> is deprecated, use instead packaged_task<R()>.
 - #7537 deprecate Mutex::scoped_lock and scoped_try_lock and boost::condition
- New Features:
 - #6270 C++11 compliance: Add thread constructor from movable callable and movable arguments
 - #7279 C++11 compliance: Add noexcept in system related functions
 - #7280 C++11 compliance: Add promise::...at_thread_exit functions
 - #7281 C++11 compliance: Add ArgTypes to packaged_task template.
 - #7282 C++11 compliance: Add packaged_task::make_ready_at_thread_exit function
 - #7412 C++11 compliance: Add async from movable callable and movable arguments
 - #7413 C++11 compliance: Add async when the launch policy is deferred.
 - #7414 C++11 compliance: future::get post-condition should be valid()==false.
 - #7422 Provide a condition variable with zero-overhead performance penality.
 - #7444 Async: Add make_future/make_shared_future.
 - #7540 Threads: Add a helper class that join a thread on destruction.
 - #7541 Threads: Add a thread wrapper class that joins on destruction.
 - #7575 C++11 compliance: A future created by async should "join" in the destructor.
 - #7587 Synchro: Add strict_lock and nested_strict_lock.
 - #7588 Synchro: Split the locks.hpp in several files to limit dependencies.
 - #7590 Synchro: Add lockable concept checkers based on Boost.ConceptCheck.
 - #7591 Add lockable traits that can be used with enable_if.
 - #7592 Synchro: Add a null_mutex that is a no-op and that is a model of UpgardeLockable.
 - #7593 Synchro: Add a externally_locked class.
 - #7594 Threads: Allow to disable thread interruptions.
- Fixed Bugs:
 - #7464 BOOST_TEST(n_alive == 1); fails due to race condition in a regression test tool.
 - #7657 Serious performance and memory consumption hit if condition_variable methods condition notify_one or notify_all is used repeatedly.
 - #7665 this_thread::sleep_for no longer uses steady_clock in thread.
 - #7668 thread_group::join_all() should check whether its threads are joinable.
 - #7669 thread_group::join_all() should catch resource_deadlock_would_occur.
 - #7671 Error including boost/thread.hpp header on iOS.
 - #7672 lockable_traits.hpp syntax error: "defined" token misspelled.
 - #7798 boost::future set_wait_callback thread safety issues.
 - #7808 Incorrect description of effects for this_thread::sleep_for and this_thread::sleep_until.
 - #7812 Returns: cv_status::no_timeout if the call is returning because the time period specified by rel_time has elapsed, cv_status::timeout otherwise.
 - #7874 compile warning: thread.hpp:342: warning: type attributes are honored only at type definition.
 - #7875 BOOST_THREAD_THROW_IF_PRECONDITION_NOT_SATISFIED should not be enabled by default.
 - #7882 wrong exception text from condition_variable::wait(unique_lock<mutex>&).
 - #7890 thread::do_try_join_until() is missing a return type.
Unordered:
- Remove support for the old pre-standard variadic pair constructors, and equality implementation. Both have been deprecated since Boost 1.48.
- More internal implementation changes, including a much simpler implementation of erase, and removed more deprecated config macros.
Utility:
- Added string_ref, a non-owning reference to a contiguous sequence of characters.
Variant:
- Added rvalue constructors and rvalue assignment operators (for C++11 compatible compilers only). Library now can be used with move-only types (#7620, #7718).
Wave:
- See the Changelog for details.
xpressive:
- Accomodate recent smart pointer changes (#7809).

Updated Tools

Boost Build System:
- Qt5 toolset
- improved rcc support (#7576)

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.1.2, 4.2.4, 4.4.4, 4.5.3, 4.6.3, 4.7.2
- GCC, C++11 mode: 4.4.4, 4.5.3, 4.6.3, 4.7.2
- Intel: 11.1, 12.1
- LLVM Clang: 2.8
- LLVM Clang, with libc++: 3.2
OS X:
- GCC: 4.4.7
- GCC, C++11 mode: 4.4.4
- Intel: 11.1, 12.0
Windows:
- Visual C++: 9.0, 10.0
FreeBSD:
- GCC: 4.2.1, 32 and 64 bit

Boost's additional test compilers include:

Linux:
- Cray: 4.6.1
- Clang: from subversion
- LLVM Clang, with libc++: 3.2
- GCC: 4.2.4, 4.4.4, 4.5.3, 4.6.3, 4.7.1
- GCC, C++11 mode: 4.4.4, 4.5.3, 4.6.3, 4.7.1, 4.7.2
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.1
- Intel, C++11 mode: 13.0.1
- Visual Age:
OS X:
- Clang: from subversion
- Clang, C++11 mode: from subversion
- Intel: 11.1, 12.0
- GCC: 4.4.7
- GCC, C++11 mode: 4.4.4
Windows:
- Visual C++: 10.0, 11.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
AIX:
- IBM XL C/C++ Enterprise Edition: V12.1.0.1

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.52.0

Mon, 5 Nov 2012 08:05:58 -0800

Updated Libraries

Accumulators:
- Fix long-standing dependency tracking bug, #7409
Config:
- Define BOOST_NO_SFINAE_EXPR for gcc-4.4, since the support was found to be too buggy.
Chrono:
- New Features:
 - #5980 Enhance chrono I/O with H. Hinnant proposal proposal which has the advantage to provide I/O for system clocks using the Gregorian Calendar.
 - #5981 Add i/o state savers for duration and time_point formatting state.
 - #7059 Add low level i/o facilities.
- Deprecated features:
 - The chrono i/o version included in Boost.Chrono 1.2.x has been completly refactored in version 2.0.0
 - chrono I/O: The manipulators __duration_short, __duration_long are depreceated. You should use the parameterized form __duration_fmt or the renamed manipulators __duration_symbol and __duration_prefix instead.
 - chrono I/O: The __duration_punct<> facet is deprecated. You should use the __get_duration_style free function to get the informations and use the __duration_units facet for localization purposes.
 - When BOOST_CHRONO_VERSION==2 the preceding deprecated functions are not available.
- Fixes:
 - #7381 C++11 compliance: unresolved symbol when assigning a constexpr duration to a non-const local variable.
 - #7479 Compile fails with compilers supporting constexpr fails if the standard library doesn't provides the constexpr interface
- Would not fix:
 - #6871 chrono_io.hpp: operator<<(ostream& os, ...) modifies the state of os. The neww io interface provided in version 2 solves this issue. You should move to the new version.
Container:
- Improved stable_vector's template code bloat and type safety.
- Changed typedefs and reordered functions of sequence containers to improve doxygen documentation.
- Fixed bugs #6615, #7139, #7215, #7232, #7269, #7439.
- Implemented LWG Issue #149 (range insertion now returns an iterator) & cleaned up insertion code in most containers
- Corrected aliasing errors.
DateTime:
- Document BOOST_DATE_TIME_NO_LIB (#6077).
- Fix nth_as_str (#7022).
- Fix some warnings (#7234).
Foreach:
- Fix alignment warning on gcc.
Function:
- Move constructors and move assignment operators added (only for compilers with C++11 rvalue references support) #7330.
Graph:
- Fixed bugs #6950, #7226,#7308, #7327, #7338, #7341, #7378, #7380, #7398, and #7428, plus others not in Trac.
Hash:
- Restore enum support, which was accidentally removed in the last version (#7437).
- New floating point hasher - will hash the binary representation on more platforms, which should be faster.
Interprocess:
- Added shrink_by and advise functions in mapped_region.
- ABI breaking: Reimplemented message_queue with a circular buffer index (the old behavior used an ordered array, leading to excessive copies). This should greatly increase performance but breaks ABI. Old behaviour/ABI can be used undefining macro BOOST_INTERPROCESS_MSG_QUEUE_CIRCULAR_INDEX in boost/interprocess/detail/workaround.hpp
- Improved message_queue insertion time avoiding priority search for common cases (both array and circular buffer configurations).
- Implemented interproces_sharable_mutex and interproces_condition_any.
- Improved offset_ptr performance.
- Added integer overflow checks.
Iterator:
- Fixed:
  - #5825 constructing function_input_iterator without consuming an item
  - #7194 Error in documentation of make_function_input_iterator
- Breaking changes:
  - Due to the fix for #5825, a function_input_iterator will no longer make unnecessary invokations to the wrapped nullary function. For example, constructing an end iterator will now not trigger an invokation; and dereferencing-and-incrementing an iterator N times will trigger N invokations, not N+1 as before. User code that relied on the old behavior will need to be adjusted.
Lexical cast:
- Restored compilation on MSVC-2003 (was broken in 1.51.0) #7255.
- Added lexical_cast(const CharType* chars, std::size_t count) function overload. #6663.
- Fixed bug #7228.
Math:
- Added Airy functions and Jacobi Elliptic functions.
- In several distributions (particulary the Students T) corrected moments for small degrees of freedom #7177 (reported by Thomas Mang).
- Corrected failure to detect bad parameters in many distributions #6934 (reported by Florian Schoppmann) by adding a function check_out_of_range to test many possible bad parameters. This test revealed several distributions where the checks for bad parameters were ineffective, and these have been rectified.
- Fixed issue in Hankel functions that causes incorrect values to be returned for x < 0 and ν odd, see #7135.
- In non-central T permitted infinite degrees of freedom #7259 implemented using the normal distribution (requested by Thomas Mang). Also much enhanced accuracy for large degrees of freedom and/or large non-centrality parameters by switching to use the Students t distribution (or Normal distribution for infinite degrees of freedom) centered at delta, when delta / (4 * v) < epsilon for the floating-point type in use. See #7259. It was also found that the incomplete beta was suffering from serious cancellation errors when degrees of freedom was very large. (That has now been fixed in our code, but any code based on Didonato and Morris's original papers (probably every implementation out there actually) will have the same issue).
- Fixed minor issues #6517, #6362, #7053, #2693, #6937, #7099.
Phoenix:
- Make Phoenix work with decltype-based boost::result_of.
Polygon:
- Included Voronoi diagram extensions.
- Introduced new Segment concept.
- Fixed compilation issues.
Proto:
- The data parameter to primitive transforms can now optionally have slots indexed by key.
- Primitive transforms can now operatate on temporary expressions that are non-const qualified.
- Add callable function object types for the free functions in <iterator> and also for some Boost.Range functions.
- Boost.MPL algorithms work on Proto expression nodes.
- proto::pass_through primitive transform now accepts an optional Domain template parameter for specifying the target domain of the resulting expression.
Ratio:
- Features:
 - Replace the short_name and long_name functions by symbol and prefix functions respectively.
- Deprecated:
 - The ratio_string<>::short_name and ratio_string<>::long_name are deprecated. Use ratio_string<>::symbol and ratio_string<>::prefix respectively. These functions be removed in 1.55.
- Fixes:
 - #7478 Compiles fails with compilers supporting char16_t and char32_t fails if the library doesn't provides std::u16string and std::u32string.
Result_of:
- Switch boost::result_of to use decltype on compilers for which support is deemed "good enough". That means if the compiler implements n3276. (For now, that only includes very recent versions of clang.)
- boost::result_of is now "sfinae-friendly" when it uses decltype. See n3436.
Thread:
- Deprecated Features: Deprecated features since boost 1.50 available only until boost 1.55. These deprecated features will be provided by default up to boost 1.52. If you don't want to include the deprecated features you could define BOOST_THREAD_DONT_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. Since 1.53 these features will not be included any more by default. Since this version, if you want to include the deprecated features yet you could define BOOST_THREAD_PROVIDE_DEPRECATED_FEATURES_SINCE_V3_0_0. These deprecated features will be only available until boost 1.55, that is you have yet 1 year to move to the new features.
  - Time related functions don't using the Boost.Chrono library, use the chrono overloads instead.
- Breaking changes when BOOST_THREAD_VERSION==3 (Default value since Boost 1.53): There are some new features which share the same interface but with different behavior. These breaking features are provided by default when BOOST_THREAD_VERSION is 3, but the user can however choose the version 2 behavior by defining the corresponding macro. As for the deprecated features, these broken features will be only available until boost 1.55.
  - #6229 C++11 compliance & Breaking change: Rename the unique_future to future following the c++11.
  - #6266 C++11 compliance & Breaking change: thread destructor should call terminate if joinable.
  - #6269 C++11 compliance & Breaking change: thread move assignment should call terminate if joinable.
- New Features:
  - #4710 C++11 compliance: Missing async().
  - #7283 C++11 compliance: Add notify_all_at_thread_exit.
  - #7345 C++11 compliance: Add noexcept to recursive mutex try_lock.
- Fixed Bugs:
  - #2361 thread_specific_ptr: document nature of the key, complexity and rationale.
  - #2797 Two problems with thread_specific_ptr.
  - #5274 failed to compile future.hpp with stlport 5.1.5 under msvc8.1, because of undefined class.
  - #5431 compile error in Windows CE 6.0(interlocked).
  - #5752 boost::call_once() is unreliable on some platforms.
  - #7045 Thread library does not automatically compile date_time.
  - #7173 wrong function name interrupt_point().
  - #7200 Unable to build boost.thread modularized.
  - #7220 gcc 4.6.2 warns about inline+dllimport functions.
  - #7238 this_thread::sleep_for() does not respond to interrupt().
  - #7245 Minor typos on documentation related to version 3.
  - #7272 win32/thread_primitives.hpp: (Unneccessary) Warning.
  - #7284 Clarify that there is no access priority between lock and shared_lock on shared mutex.
  - #7329 boost/thread/future.hpp does not compile on HPUX.
  - #7336 BOOST_THREAD_DONT_USE_SYSTEM doesn't work.
  - #7349 packaged_task holds reference to temporary.
  - #7350 allocator_destructor does not destroy object
uBLAS:
- improved performance of inplace_solve (issue #4024)
- fixed coordinate_matrix for use with gcc 4.7 (issue #7363)
Unordered:
- In assignment, reuse existing nodes where possible.
- Fix bugs when erasing ranges (#7471).
- Some work on the implementation.
Uuid:
- Fixes #6118, #6788, #7375.
- #7128 - fixed bug in sha1.hpp for messages longer than 536,870,912 bytes.
Wave:
- See the Changelog for details.
xpressive:
- Make sub_match work with Boost.Range. Fixes #7237.

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.2.4, 4.3.4, 4.4.3, 4.5.3, 4.6.2, 4.7.2
- GCC, C++11 mode: 4.3.4, 4.4.3, 4.5.3, 4.6.2
- Intel: 11.1, 12.0, 12.1
- LLVM Clang: 2.8
OS X:
- GCC: 4.4.4
- GCC, C++11 mode: 4.4.4
- Intel: 11.1, 12.0
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.0
- Visual C++: 8.0, 9.0, 10.0
FreeBSD:
- GCC: 4.2.1, 32 and 64 bit

Boost's additional test compilers include:

Linux:
- Cray: 8.0
- Clang: from subversion
- LLVM Clang:
- GCC: 4.2.4, 4.3.4, 4.4.4, 4.5.3, 4.6.2, 4.6.3, 4.7.0, 4.7.1, 4.7.2
- GCC, C++11 mode: 4.3.4, 4.4.4, 4.5.3, 4.6.3, 4.7.1
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.0, 12.1
- Visual Age: 10.1
OS X:
- Clang: from subversion
- Clang, C++11 mode: from subversion
- Intel: 11.1, 12.0
- GCC: 4.4.4
- GCC, C++11 mode: 4.4.4
Windows:
- Visual C++: 8.0, 9.0, 10.0, 11.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.0
AIX:
- IBM XL C/C++ Enterprise Edition: V12.1.0.0
FreeBSD:
- GCC: 4.2.1, 64 bit
Solaris:
- Sun: 5.10

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.51.0

Mon, 20 Aug 2012 16:00:21 -0700

Patches

Locale Patch - Fixes a bug which causes boost::locale::utf::utf_traits to accept some invalid UTF-8 sequences, which is a possible security flaw.

New Libraries

Context: Context switching library, from Oliver Kowalke.

Updated Libraries

Algorithm:
- Fixed is_sorted_until ; now matches the c++11 standard behavior on ranges with duplicate values.
- Added range support for the rest of the search algorithms.
- unhex now uses Boost.Exception to signal bad input.
Asio:
- Fixed an incompatibility between ip::tcp::iostream and C++11 (#7162).
- Decorated GCC attribute names with underscores to prevent interaction with user-defined macros (#6415).
- Added missing #include <cctype>, needed for some versions of MinGW.
- Changed to use gcc's atomic builtins on ARM CPUs, when available (#7140).
- Changed strand destruction to be a no-op, to allow strand objects to be destroyed after their associated io_service has been destroyed.
- Added support for some newer versions of glibc which provide the epoll_create1() function but always fail with ENOSYS (#7012).
- Changed the SSL implementation to throw an exception if SSL engine initialisation fails (#6303).
- Fixed another regression in buffered_write_stream (#6310).
- Implemented various minor performance improvements, primarily targeted at Linux x86 and x86-64 platforms.
Config:
- Deprecated a whole bunch of macros that were c++11 specific, but not named to show that they were c++11 specific. Made new macros with better names, and paired the old macros with the new ones. Updated the documentation to list the deprecated macros.
Chrono:
- #6918 Boost Chrono compilation failure on HP uX due to undefined pthread_getcpuclockid.
- #6241 boost::chrono compilation problems without std::wstring support.
- #6987 Documentation & C++11.
- #7041 time_point.hpp depends on Boost.System.
- #7042 Avoiding time_point and duration dependency on time.h and CLOCK_REALTIME.
- #7058 Make it work when BOOST_NO_EXCEPTIONS is defined.
- #7069 Misspellings in clock_string<thread_clock>.
- #7081 WinError.h capitalization in boost/detail/win/basic_types.hpp.
Geometry:
- points accessed through a pointer (e.g. in a linestring) should now be specialized without the pointer. In previous versions a type my_point used like linestring<my_point*> had to be specalized like: template<> struct tag<my_point*>. Now the library itself removes the pointer before calling the traits class, so now it should be like: template<> struct tag<my_point>
- intersection was sometimes wrong for integer points, fixed
- documentation, order of parameters in simplify was wrong, fixed
- 7030 spherical distance, fixed (by patch of Karsten Ahnert)
Graph:
- Refactored support for internal and bundled properties in Boost.Graph-provided graph types, and cleaned up named parameter functionality:
  - Enabled old-style (non-bundled) internal properties in compressed_sparse_row_graph.
  - Bundled properties should work correctly for all graph types and adaptors.
- Bugs fixed:
  - #6993: Typo Bundled Properties document
  - #7002: Problem with initialization of CSR bidirectional graph
  - #7023: Enclose internal type graphml_reader in anonymous namespace
  - Other bugs and warnings not in Trac
Hash:
- Support the standard smart pointers.
- hash_value now implemented using SFINAE to avoid implicit casts to built in types when calling it.
- Updated to use the new config macros.
Lexical cast:
- Better performance, less memory usage for boost::array<character_type, N> and std::array<character_type, N> conversions.
- Fixed bug with volatile input parameter #7157.
Math:
- Updated to use the new config macros.
MSM:
- Support for boost::any https://www.boost.org/doc/libs/1_51_0/libs/msm/doc/HTML/ch03s03.html#any-event or kleene https://www.boost.org/doc/libs/1_51_0/libs/msm/doc/HTML/ch03s04.html#kleene-event as acceptable events
- Bugfix: compiler error with fsm internal table and none (compound) event.
- Bugfix: euml::defer_ leading to stack overflow.
Proto:
- Proto transforms get pseudo-parameter pack expansion support for unpacking expressions. See the Release Notes for more information.
Ratio:
- #7075 Workaround for error: the type of partial specialization template parameter constant "n1" depends on another template parameter.
Regex:
- Updated to use the new config macros.
Thread:
- #4258 Linking with boost thread does not work on mingw/gcc 4.5.
- #4885 Access violation in set_tss_data at process exit due to invalid assumption about TlsAlloc.
- #6931 mutex waits forwever with Intel Compiler and /debug:parallel
- #7044 boost 1.50.0 header missing.
- #7052 Thread: BOOST_THREAD_PROVIDES_DEPRECATED_FEATURES_SINCE_V3_0_0 only masks thread::operator==, thread::operator!= forward declarations, not definitions.
- #7066 An attempt to fix current_thread_tls_key static initialization order.
- #7074 Multiply defined symbol boost::allocator_arg.
- #7078 Trivial 64-bit warning fix on Windows for thread attribute stack size
- #7089 BOOST_THREAD_WAIT_BUG limits functionality without solving anything
Unordered:
- Fix construction/destruction issue when using a C++11 compiler with a C++03 allocator (#7100).
- Remove a try..catch to support compiling without exceptions.
- Adjust SFINAE use to try to supprt g++ 3.4 (#7175).
- Updated to use the new config macros.
Wave:
- See the Changelog for details.
xpressive:
- Work around buggy wide ctype facet on cygwin and mingw.
- Work around absence of __isctype on some glibc implementations.
- op::as shouldn't assume string::iterator != char*.
- Fix assertion in cpp_regex_traits on libc++, thanks to John Fletcher.

Compilers Tested

Boost's primary test compilers are:

Linux:
- GCC: 4.2.4, 4.3.4, 4.4.3, 4.5.3, 4.6.2, 4.7
- GCC, C++11 mode: 4.3.4, 4.4.3, 4.5.3, 4.6.2
- Intel: 11.1, 12.0, 12.1
- LLVM Clang 2.8
OS X:
- GCC: 4.4
- GCC, C++11 mode: 4.4
- Intel: 11.1, 12.0
Windows:
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.3
- Visual C++: 8.0, 9.0, 10.0
FreeBSD:
- GCC: 4.2.1, 32 and 64 bit

Boost's additional test compilers include:

Linux:
- Clang: from subversion
- LLVM Clang: 3.0
- GCC: 4.2.4, 4.3.4, 4.4.4, 4.4.7, 4.5.3, 4.6.2, 4.6.3, 4.7.0, 4.7.1
- GCC, C++11 mode: 4.3.4, 4.4.4, 4.5.3, 4.6.3
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.0, 12.1
- Visual Age: 10.1
OS X:
- Clang: from subversion
- Clang, C++11 mode: from subversion
- Intel: 11.1, 12.0
- GCC: 4.4
- GCC, C++11 mode: 4.4
Windows:
- Visual C++: 8.0, 9.0, 10.0
- GCC, mingw: 4.4.0, 4.6.3, 4.7.0
AIX:
- IBM XL C/C++ Enterprise Edition: V12.1.0.0
FreeBSD:
- GCC: 4.2.1, 32 and 64 bit
Solaris:
- Sun: 5.10

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.50.0

Thu, 28 Jun 2012 08:48:57 -0400

Patches

Boost.Unordered patch - Fixes a bug when compiled using a C++11 compiler, but with a C++03 allocator. When inserting elements, allocator_traits detects that the node can be constructed using an accidental implicit conversion which causes several problems.
Locale Patch - Fixes a bug which causes boost::locale::utf::utf_traits to accept some invalid UTF-8 sequences, which is a possible security flaw.

New Libraries

Algorithm: A collection of useful generic algorithms, from Marshall Clow. This includes several different searching algorithms, as well as most of the new algorithms from the C++11 standard library
Functional/OverloadedFunction: Overload different functions into a single function object, from Lorenzo Caminiti.
LocalFunction: Program functions locally, within other functions, directly within the scope where they are needed, from Lorenzo Caminiti.
Utility/IdentityType: Wrap types within round parenthesis so they can always be passed as macro parameters, from Lorenzo Caminiti.

Updated Libraries

Accumulators:
- add missing #include <boost/throw_exception.hpp>, fixes #6702.
- work around for msvc which allows ctor templates to be copy ctors, fixes #6535.
- shorten filenames to meet boost guidelines, fixes #6196.
Array:
- add support for Boost.Hash #6791.
Asio:
- Changed the epoll_reactor backend to do lazy registration for EPOLLOUT events.
- Fixed the epoll_reactor handling of out-of-band data, which was broken by an incomplete fix in the last release.
- Changed Asio's SSL wrapper to respect OpenSSL's OPENSSL_NO_ENGINE feature test #define (#6432).
- Fixed windows::object_handle so that it works with Windows compilers that support C++11 move semantics (such as g++).
- Improved the performance of strand rescheduling.
- Added support for g++ 4.7 when compiling in C++11 mode (#6620).
- Fixed a problem where signal_set handlers were not being delivered when the io_service was constructed with a concurrency_hint of 1 (#6657).
Bimap:
- Remove spurious dependency on Boost.Serialization, fixes #3868.
- Solve unused constructor parameter warning, fixes #5749.
- Add key_type and mapped_type (leaving data_type for backward compatibility) typedefs to map views, fixes #6031.
Chrono:
- Fixed Bugs:
  - #6361 integer overflow in boost::chrono::process_real_cpu_clock::now() under Windows 32bits.
  - #6628 compiler warning in process_cpu_clocks.hpp.
  - #6666 thread_clock.hpp needs pthread.h.
Concept Check:
- Fixed:
  - #6738 Shadowed variable warning.
Filesystem:
- Remove Filesystem Version 2 from the distribution. Version 3 is now the only distributed version. Those still using V2 are urged to migrate to V3 as soon as possible.
- Add constexpr value_type preferred_separator to class path.
- Fix #5118, replace_extension doesn't work as specified in documentation. The documentation, implementation, and test cases have all had fixes applied. The documentation had failed to mention that any existing extension is removed. The behavior for simple cases has been reverted to the Version 2 behavior, but with corrections so that complex replacements now work. Two test cases from #5118 have been added.
- Fix #3737, Boost.Filesystem does not compile on Windows Mobile. On Windows, <sys/stat.h> is no longer included.
- Fix #4065, Boost Filesystem lexicographic path comparison inconsistent. This required multiple source code bug fixes and code cleanup, correcting problems not related to lexicographical issues.
- Add class path member function compare for consistency with std::string.
- Tighten BOOST_FILESYSTEM_DYN_LINK and BOOST_FILESYSTEM_STATIC_LINK logic in filesystem/config.hpp so that one or the other is always defined, and both being defined is a #error.
- Fix #6690 and #6737, resolving static linking related problems with VC++ 8 through 11. Note that this fix may reintroduce codecvt thread safety problems #4889, #6320, for these compilers if static linking is used.
- Add path::operator+= and concat functions to tack on things like suffixes or numbers. Suggested by Ed Smith-Rowland and others.
- Fix #6809, Implementation of filesystem::rename() method for MS Windows is wrong, by adding MOVEFILE_COPY_ALLOWED to deal with renames across drives, volumes, file systems. Fix has no effect on non-Windows systems.
- Fix #6819, A path operand with a source that was a one character array was treated as empty, even if it wasn't empty. Such arrays can occur in unions or in code using C variable length array idioms.
- Fix #6932, create_directories throws exception even if error_code is specified.
Foreach:
- Revert fix for #6131 which caused more harm than good.
Geometry:
- Fixed Bugs:
  - the return type of comparable projected point strategy for integer points was wrong (integer), fixed
  - several robustness issues in intersection of segments and polygons, fixed
  - invalid intersection output is filtered out
  - disjoint for multi_polygon's might incorrectly return true, fixed
- Solved tickets
  - 6585 patch for alternative syntax multipoint, applied
  - 6584 patch for bug in distance, applied
  - 5730 same issue as 6584, fixed
  - 6166 patch for missing transformation, applied
  - 6696 invalid intersection output, was (by chance) already fixed in Trunk before reported
- Additional functionality
  - added algorithm "touches" (OGC SF compliant) for *polygon/*polygon
Graph:
- Fixed Bugs:
 - #4622 clear_vertex on a vertex with a self-loop can cause a segmentation fault.
 - #6033 Lowpoint map calculated by biconnected_components(...) is sometimes wrong.
 - #6242 isomorphism doesn't reset mapping.
 - #6435 cube_topology documentation should say 3D, not 2D.
 - #6520 small_world_1_70_6_0p02.png is broken in documentation of graph_parallel.
 - #6564 BGL copy constructor for subgraph does not track local vertices/edges.
 - #6573 BGL: boost::isomorphism routine fails with large graphs.
 - #6583 Dijkstra Visitor Concept docs probably show wrong type for variable.
 - #6647 BGL strong_components do not compile on MSVC 8.
 - #6656 Dependent type in subgraph used without typename.
 - #6707 is_straight_line_drawing.hpp missing #include <map>.
 - #6708 Make bool boost::intersects() in is_straight_line_drawing.hpp inline?
 - #6739 Cannot use write_graphviz_dp with a constified subgraph.
 - #6858 boost::get() calls wrongly resolved by g++.
 - #6892 VertexIndexGraph concept not required for bron_kerbosch_all_cliques().
 - Other bugs and warnings not in Trac.
Hash:
- Support std::array and std::tuple when available (#6806).
- Avoid gcc's -Wfloat-equal warning (#6771).
- Add deprecation warning to the long deprecated boost/functional/detail/container_fwd.hpp.
Iostreams:
- Improved gzip support (#5908).
- Update tests for latest Boost.Filesystem and Boost.Test.
- Fix some documentation errors (#6530, #6650).
Iterator:
- Fixed:
  - #5127 Incorrect result_of usage in transform_iterator
  - #5697 iterator_facade::operator-> is broken for proxy references
MultiArray:
- Concepts bug fix and Workaround for Visual Studio 2010 (#4874)
- Fix to assert.cpp test case (Patch)
Lexical cast:
- boost::bad_lexical_cast exception is now globaly visible and can be catched even if code is compiled with -fvisibility=hidden
- Now it is possible to compile and use library with disabled exceptions #5800
- Better performance, less memory usage and bugfixes for boost::iterator_range<character_type*> conversions
- Fixed bugs and warnings: #6645, #6562, #6812, #6852, #6717, #6770, #6504.
Locale:
- Fixed build issues with STLPort library
- Boost.System is now required depenency
- Fixed bugs #6635, #6833
Math:
- Promoted math constants to be 1st class citizens, including convenient access to the most widely used built-in float, double, long double via three namespaces.
- Added the Owen's T function and Skew Normal distribution written by Benjamin Sobotta.
- Added Hankel functions.
- Corrected issue #6627 nonfinite_num_put formatting of 0.0 is incorrect based on a patch submitted by K R Walker.
- Changed constant initialization mechanism so that it is thread safe even for user-defined types, also so that user defined types get the full precision of the constant, even when long double does not. So for example 128-bit rational approximations will work with UDT's and do the right thing, even though long double may be only 64 or 80 bits.
- Fixed issue in bessel_jy which causes Y[sub 8.5](4[pi]) to yield a NaN.
MSM:
- eUML : better syntax for front-ends defined with eUML as transition table only. Caution: Breaking Change!https://www.boost.org/doc/libs/1_50_0/libs/msm/doc/HTML/ch03s04.html#eUML-composite-table
- Bugfix: graph building was only working if initial_state defined as a sequence.
- Bugfix: flags defined for a Terminate or Interrupt state do not break the blocking function of these states any more.
- Bugfix: multiple deferred events from several regions were not working in every case.
- Bugfix: visitor was passed by value to submachines.
- Bugfix: no_transition was not called for submachines who send an event to themselves.
- Fixed warnings with gcc.
Program Options:
- Improved error reporting (Patch from Leo Goodstadt).
- Support for customizing name of option's value in help messages (#4781)
- Fixed compilation with gcc 4.7 (#6790).
PropertyMap:
- Fixed Bugs:
  - #6539 the return type of get() is not documented correctly.
  - #6721 property_map_traits documentation does not mention reference.
Proto:
- Use decltype-based result_of if and only if the compiler implements N3276.
- For C++11, force parameter to mpl::eval_if_c and mpl::if_c to be bool.
- Disable '__forceinline not inlined' warning on msvc.
Ratio:
- Fixed Bugs:
  - #6498 boost::ratio won't compile with default settings.
ScopeExit:
- New Features:
  - Use variadic macros to specify captures as commas-separated lists (but kept preprocessor sequence syntax for backward compatibility).
  - Capture the object in scope using this_.
  - Support empty captures using void.
  - Implicit lambda-like captures using BOOST_SCOPE_EXIT_ALL on compilers that support C++11 lambda functions.
Thread:
- New Features:
 - #1850 Request for unlock_guard to compliment lock_guard.
 - #2637 Request for shared_mutex duration timed_lock and timed_lock_shared.
 - #2741 Proposal to manage portable and non portable thread attributes.
 - #3567 Request for shared_lock_guard.
 - #6194 Adapt to Boost.Move.
 - #6195 c++11 compliance: Provide the standard time related interface using Boost.Chrono.
 - #6217 Enhance Boost.Thread shared mutex interface following Howard Hinnant proposal.
 - #6224 c++11 compliance: Add the use of standard noexcept on compilers supporting them.
 - #6226 c++11 compliance: Add explicit bool conversion from locks.
 - #6228 Add promise constructor with allocator following the standard c++11.
 - #6230 c++11 compliance: Follows the exception reporting mechanism as defined in the c++11.
 - #6266 Breaking change: thread destructor should call terminate if joinable.
 - #6269 Breaking change: thread move assignment should call terminate if joinable.
 - #6272 c++11 compliance: Add thread::id hash specialization.
 - #6273 c++11 compliance: Add cv_status enum class and use it on the conditions wait functions.
 - #6231 Add BasicLockable requirements in the documentation to follow c++11.
 - #6342 c++11 compliance: Adapt the one_flag to the c++11 interface.
 - #6671 upgrade_lock: missing mutex and release functions.
 - #6672 upgrade_lock:: missing constructors from time related types.
 - #6675 upgrade_lock:: missing non-member swap.
 - Added missing packaged_task::result_type and packaged_task:: constructor with allocator.
 - Added packaged_task::reset()
- Fixed Bugs:
 - #2575 Bug- Boost 1.36.0 on Itanium platform.
 - #4345 thread::id and joining problem with cascade of threads.
 - #4921 BOOST_THREAD_USE_DLL and BOOST_THREAD_USE_LIB are crucial and need to be documented.
 - #5013 documentation: boost::thread: pthreas_exit causes terminate().
 - #5173 boost::this_thread::get_id is very slow.
 - #5351 interrupt a future get boost::unknown_exception.
 - #5516 Upgrade lock is not acquired when previous upgrade lock releases if another read lock is present.
 - #5990 shared_future<T>::get() has wrong return type.
 - #6174 packaged_task doesn't correctly handle moving results.
 - #6222 Compile error with SunStudio: unique_future move.
 - #6673 shared_lock: move assign doesn't works with c++11.
 - #6674 shared_mutex: try_lock_upgrade_until doesn't works.
 - Fix issue signaled on the ML with task_object(task_object const&) in presence of task_object(task_object&&)
Unordered:
- Fix equality for unordered_multiset and unordered_multimap.
- Implement reserve (#6857).
- Avoid gcc's -Wfloat-equal and -Wshadow warnings (#6190, #6771).
- Fix namespace issue with bcp (#6905).
- Fix Sun workarounds (#6784).
- Some internal changes to bucket allocation.
- See the change log for full details.
Wave:
- Wave V2.3.2, see the Changelog for details.
xpressive:
- Remove very ugly lexical_cast hack with a slightly less ugly one.
- Replace MPL assert with static assert since it's problematic in C++11, fixes #6846.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Intel: 11.1
- LLVM Clang 2.8
- GCC: 4.2.4, 4.3.4, 4.4.3, 4.5.3, 4.6.2
- GCC, C++0x mode: 4.3.4, 4.4.3, 4.5.3, 4.6.2
OS X:
- Intel: 11.1
- GCC: 4.4.4
- GCC, C++0x mode: 4.4.4
Windows:
- Visual C++ 8.0, 9.0, 10.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.1, 4.7.0
FreeBSD:
- GCC 4.2.1, 32 and 64 bit
QNX:
- QCC, C++0x mode: 4.4.0, 4.4.7, 4.5.4, 4.6.3, 4.7.0

Boost's additional test compilers include:

Linux:
- Clang from subversion
- GCC: 4.2.4, 4.3.4, 4.4.4, 4.5.3, 4.6.2
- GCC, C++0x mode: 4.3.4, 4.4.4, 4.5.3, 4.6.2
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.0, 12.1
- Visual Age 10.1
OS X:
- Clang from subversion
- Intel 11.1, 12.0
- GCC: 4.4.4
- GCC, C++0x mode: 4.4.4
Windows:
- Visual C++ 8.0, 10.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.2, 4.5.4, 4.6.4, 4.7.0
- GCC, C++0x mode, mingw: 4.5.2
AIX:
- IBM XL C/C++ Enterprise Edition, V12.1.0.0
FreeBSD:
- GCC 4.2.1, 32 and 64 bit
Solaris:
- Sun 5.10

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James, Vladimir Prus and Marshall Clow managed this release.

Version 1.49.0

Fri, 24 Feb 2012 16:20:32 -0500

New Libraries

Heap: Priority queue data structures, from Tim Blechmann.

Updated Libraries

Asio:
- Added a new class template basic_waitable_timer based around the C++11 clock type requirements. It may be used with the clocks from the C++11 <chrono> library facility or, if those are not available, Boost.Chrono. The typedefs high_resolution_timer, steady_timer and system_timer may be used to create timer objects for the standard clock types.
- Added a new windows::object_handle class for performing waits on Windows kernel objects. Thanks go to Boris Schaeling for contributing substantially to the development of this feature.
- On Linux, connect() can return EAGAIN in certain circumstances. Remapped this to another error so that it doesn't look like a non-blocking operation (#6048).
- Fixed a compile error on NetBSD (#6098).
- Fixed deadlock on Mac OS X (#6275).
- Fixed a regression in buffered_write_stream (#6310).
- Fixed a non-paged pool "leak" on Windows when an io_service is repeatedly run without anything to do (#6321).
- Reverted earlier change to allow some speculative operations to be performed without holding the lock, as it introduced a race condition in some multithreaded scenarios.
- Fixed a bug where the second buffer in an array of two buffers may be ignored if the first buffer is empty.
Chrono:
- Bug Fixes:
  - #6092 Input from non integral durations makes the compiler fail.
  - #6093 [1/3]second fails as valid duration input.
  - #6113 duplicate symbol when BOOST_CHRONO_HEADER_ONLY is defined.
  - #6243 Sandia-pgi-11.9: more than one instance of overloaded function "min" matches.
  - #6257 process_cpu_clock::now() on linux gives time_points 1/1000 times.
Container:
- Fixed bugs #6499, #6336, #6335, #6287, #6205, #4383.
- Added allocator_traits support for both C++11 and C++03 compilers through an internal allocator_traits clone.
Filesystem:
- Fix #3714, Added test cases and fixes for class path errors when assignment or append used self or portion of self as source.
- Fix #4889, #6320, Locale codecvt_facet not thread safe on Windows. Move Windows, Mac OS X, locale and codecvt facet back to namespace scope. POSIX except OS X uses local static initialization (IE lazy) to ensure exceptions are catchable if environmental variables are misconfigured and to avoid use of locale("") if not actually used.
- Fix #5652, recursive_directory_iterator fails on cyclic symbolic links. Thanks to Daniel Aarno for the patch.
- Fix #5653, recursive_directory_iterator(error_code) can still throw filesystem_error.
- Fix #5900, directory_iterator access violation on Windows if error is thrown. Thanks to Andreas Eckleder for the patch.
- Fix #5900 comment 2, a bug in director_iterator construction with error_code argument that caused increment to be called without the ec argument being passed.
- Fix #5989 by cleaning up test suite path_test.cpp code even though the ticket itself was not a defect, and clarifying docs; iteration over a path yields generic format.
- Fix #5592, Change Windows codecvt processing from CP_THREAD_ACP to CP_ACP.
- Operations function fixes for PGI compiler, thanks to Noel Belcourt.
- Relax permissions test to reflect reality, particularly on the Sandia test platforms.
Foreach:
- Fix for #6131
Geometry:
- Fixed bugs
  - Distance for multi-geometries ignored specified distance strategy.
  - In difference for polygon/multi_polygon (reported 2011/10/24 on GGL-list).
  - Raise exception for calculation of distances of multi-geometrie(s) where one of them is empty
  - Multi DSV did not correctly use settings.
  - Self-intersections could sometimes be missed (introduced in 1.48).
  - Convex hull crashed on empty range (e.g. empty multi point).
- Solved tickets
  - #6028 Documentation: closure.
  - #6178 Missing headerfile.
  - #6021 convex hull of multipoint.
- Additional functionality
  - Support for line/polygon intersections and differences
  - Support for convert of segment/box of different point types
  - Support for append for multi point
  - Scalar functions (distance, area, length, perimeter) now throw an empty_input_exception on empty input
- Documentation
  - Updated support status
- Internal changes
  - Updates in specializations/not_implemented for distance/convert/assign/area
  - Move of wkt/dsv to io folder, making domains redundant
  - Strategy concepts assigned to zero to avoid clang warnings (patched by Vishnu)
Graph:
- Fixed bugs #5881, #6033, #6061, #6137, #6246, #6239, #6293, #6306, #6313 and #6371, plus others not in Trac.
- Re-enabled LEDA graph support (thanks to Jens Muller for the patch).
- Added documentation for edge_predecessor_recorder.
Icl:
- Fixed tickets #6095 and #6210.
- Added move semantics for constructors, assignment operators and binary operators.
Interprocess:
- Fixed bugs #6531, #6412, #6398, #6340, #6319, #6287, #6265, #6233, #6147, #6134, #6058, #6054, #5772, #5738, #5622, #5552, #5518, #4655, #4452, #4383, #4297.
- Fixed timed functions in mutex implementations to fulfill POSIX requirements: Under no circumstance shall the function fail with a timeout if the mutex can be locked immediately. The validity of the abs_timeout parameter need not be checked if the mutex can be locked immediately.
Intrusive:
- Fixed bugs #6347, #6223, #6153.
Lexical cast:
- Fixed bugs and warnings: #6127, #6132, #6159, #6182, #6186, #6193, #6264, #6290, #6298, #6400.
- Better performance and less memory usage for boost::container::basic_string conversions.
Locale:
- Fixed incorrect use of MultiByteToWideChar in detection of invalid input sequences.
Move:
- Fixed bugs #6417, #6183, #6185, #6395, #6396,
PropertyTree:
- Fixes for bugs #4840, #5259, #5281, #5944, #5757, #5710, and #5307.
Proto:
- Force some functions to be inline, fixes #5735.
- Add user documentation for per-domain as_expr and as_child; other doc tweaks.
- Fix some buggy and over-complicated example programs.
- Add some missing copyright notices.
Spirit:
- Spirit V2.5.2, see the 'What's New' section for details.
Thread:
- Fixed Bugs:
  - #2309 Lack of g++ symbol visibility support in Boost.Thread.
  - #2639 documentation should be extended(defer_lock, try_to_lock, ...).
  - #3639 Boost.Thread doesn't build with Sun-5.9 on Linux.
  - #3762 Thread can't be compiled with winscw (Codewarrior by Nokia).
  - #3885 document about mix usage of boost.thread and native thread api.
  - #3975 Incorrect precondition for promise::set_wait_callback().
  - #4048 thread::id formatting involves locale
  - #4315 gcc 4.4 Warning: inline ... declared as dllimport: attribute ignored.
  - #4480 OpenVMS patches for compiler issues workarounds.
  - #4819 boost.thread's documentation misprints.
  - #5040 future.hpp in boost::thread does not compile with /clr.
  - #5423 thread issues with C++0x.
  - #5502 race condition between shared_mutex timed_lock and lock_shared.
  - #5594 boost::shared_mutex not fully compatible with Windows CE.
  - #5617 boost::thread::id copy ctor.
  - #5739 set-but-not-used warnings with gcc-4.6.
  - #5826 threads.cpp: resource leak on threads creation failure.
  - #5839 thread.cpp: ThreadProxy leaks on exceptions.
  - #5859 win32 shared_mutex constructor leaks on exceptions.
  - #6100 Compute hardware_concurrency() using get_nprocs() on GLIBC systems.
  - #6141 Compilation error when boost.thread and boost.move are used together.
  - #6168 recursive_mutex is using wrong config symbol (possible typo).
  - #6175 Compile error with SunStudio.
  - #6200 patch to have condition_variable and mutex error better handle EINTR.
  - #6207 shared_lock swap compiler error on clang 3.0 c++11.
  - #6208 try_lock_wrapper swap compiler error on clang 3.0 c++11.
Unordered:
- On compilers without rvalue references, the containers are no longer movable by default, as move emulation was causing some odd quirks (#6167, #6311). Define BOOST_UNORDERED_USE_MOVE to make them movable - Boost.Move is still used for elements regardless.
- Fix sequence point warning (#6370).
- Better support for C++11 compilers using older standard libraries.
Uuid:
- fixed #6258
- fixed #5325 (sha1 implementation handles messages as long as the specification)
- progress on #6118 (there are fewer warnings)
xpressive:
- Eliminate some unused variable warnings on gcc.

Compilers Tested

Boost's primary test compilers are:

Linux:
- Intel: 11.1
- LLVM Clang 2.8
- GCC: 3.4.6, 4.2.4, 4.3.4, 4.4.3, 4.5.2, 4.6.2
- GCC, C++0x mode: 4.3.4, 4.4.3, 4.5.2
OS X:
- Intel: 11.1
- GCC: 4.2.1, 4.4.4
- GCC, C++0x mode: 4.4.4
Windows:
- Visual C++ 8.0, 9.0, 10.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.1, 4.7.0
FreeBSD:
- GCC 4.2.1, 32 and 64 bit.
QNX:
- QCC, C++0x mode: 4.4.2, 4.6.1, 4.6.2

Boost's additional test compilers include:

Linux:
- GCC: 4.2.4, 4.3.4, 4.4.4, 4.5.2, 4.6.2
- GCC, C++0x mode: 4.3.4, 4.4.4, 4.5.2
- pgCC: 11.9
- Intel: 10.1, 11.1, 12.0
- PathScale: 4.0.8
- Visual Age 10.1
OS X:
- Clang from subversion
- Intel 11.1, 12.0
- GCC: 4.4.4
- GCC, C++0x mode: 4.4.4
Windows:
- Visual C++ 8.0, 9.0, 10.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
- GCC, mingw: 4.4.0, 4.5.2
- GCC, C++0x mode, mingw: 4.5.2
- GCC, mingw 64-bit: 4.4.7, 4.5.4, 4.6.1
AIX:
- IBM XL C/C++ Enterprise Edition, V11.1.0.0
FreeBSD:
- GCC 4.2.1, 32 and 64 bit
Solaris:
- Sun 5.10

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James and Vladimir Prus managed this release.

Version 1.48.0

Tue, 15 Nov 2011 10:47:30 -0500

New Libraries

Container: Standard library containers and extensions, from Ion Gaztañaga.
Locale: Provide localization and Unicode handling tools for C++, from Artyom Beilis.
Move: Portable move semantics for C++03 and C++11 compilers, from Ion Gaztañaga.

Updated Libraries

Asio:
- Implemented various performance improvements, including:
  - Using thread-local operation queues in single-threaded use cases (i.e. when concurrency_hint is 1) to eliminate a lock/unlock pair.
  - Allowing some epoll_reactor speculative operations to be performed without holding the lock.
  - Improving locality of reference by performing an epoll_reactor's I/O operation immediately before the corresponding handler is called. Also improves scalability across CPUs.
  - Specialising asynchronous read and write operations for buffer sequences that are arrays (boost::array or std::array) of exactly two buffers.
- Fixed compile error in regex overload of async_read_until (#5688).
- Fixed Windows-specific compile error by explicitly specifying the signal() function from the global namespace (#5722).
- Changed deadline_timer implementation to not read clock unless the timer heap is non-empty.
- Changed SSL buffer sizes to be large enough to hold a complete TLS record (#5854).
- Fixed synchronous null_buffers operations so that they obey the user's non-blocking setting (#5756).
- Changed to set fd_set size at runtime when using Windows.
- Disabled MSVC warning due to const qualifier being applied to function type.
- Fixed crash that occurs when using Intel C++ compiler (#5763).
- Changed OpenSSL initialisation to support all available algorithms.
- Fixed SSL error mapping when session is gracefully shut down.
- Added some latency test programs.
- Clarified that a read operation ends when the buffer is full (#5999).
- Fixed exception safety issue in epoll_reactor initialisation (#6006).
- Made number of strand implementations configurable via BOOST_ASIO_STRAND_IMPLEMENTATIONS macro.
- Added support for BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION flag which switches strand allocation to use a round-robin approach rather than hashing.
- Fixed potential strand starvation issue that can occur when strand.post() is used.
Chrono:
- #5979 Added chrono rounding utilities as defined by Howard Hinnant here.
- #5978 Add BOOST_CHRONO_HAS_PROCESS_CLOCKS to know if process clocks are available.
- #5998 Make possible to disable hybrid error handling.
- #5906 Take in account the constexpr as defined in the standard.
- #5907 Take in account noexcept for compilers supporting it.
- Fixed some bugs.
- See the History for more details.
Config:
- Add BOOST_NO_DECLTYPE_N3276 config macro. (See N3276.)
Fusion:
- Make single_view a random access fusion sequence.
- Remove bogus compile-time asserts from fusion::distance.
- Cleaner implementation of segmented Fusion.
Geometry:
- Bugfixes:
 - Robustness issue, in some circumstances the union failed to output. Fixed.
 - Robustness issue, in some circumstances the calculated intersection point was outside the segment. Fixed.
 - Concept issue, cartesian intersect didn't understand segments other than the provided one. Fixed.
 - Sometimes self-intersections in linestrings were missed. Fixed.
 - The fusion coordinate system was not registered correctly. Fixed.
- Solved tickets:
 - #5726 (Segment intersection algorithm still assumes 'first', 'second' members)
 - #5744 (mistake fusion adapt example)
 - #5748 (need include <boost/foreach.hpp>)
 - #5954 (distance_pythagoras skips sqrt() step)
- Improvements on algorithms:
 - Checking self-intersections is now not done automatically, this can blast performance.
 - Besides that, checking self-intersections is made faster.
 - Intersections now avoid outputting duplicate points. So they output the minimal set.
- Additional algorithms:
 - covered_by: within is defined as "within, not on boundary". covered_by is "within or on boundary"
- Additional functionality:
 - within: strategies can now be specified for within<point, box> and within<box, box>
 - convert: a much broader range of conversions is supported
 - assign: idem, (currently partly) synonym for convert (but reversed arguments)
- Additional coordinate types:
 - Basic support for Boost.Rational
Graph:
- Fixed bugs #5185, #5506, #5813 and #5919.
- Various other bug fixes not in Trac.
- Changed edge_descriptor type for reverse_graph to a new data type to avoid ambiguities with the edge_descriptor of the underlying graph.
Interprocess:
- Fixed bugs #2796, #4031, #4251, #4452, #4895, #5077, #5120, #5123, #5230, #5197, #5287, #5294, #5306, #5308, #5392, #5409,
- Added support to customize offset_ptr and allow creating custom managed segments that might be shared between 32 and 64 bit processes.
- Shared memory in windows has again filesystem lifetime: kernel bootstamp and WMI use to get a reliable timestamp was causing a lot of trouble.
Intrusive:
- Fixed bugs #4797, #5165, #5183, #5191.
Lexical cast:
- Added code to work with Inf and NaN values on any platform (#5689).
- New Quickbook documentation (#5723).
- Better performance and less memory usage for many combinations of Source and Target types.
- Better performance for C locale.
Math:
- Added new series evaluation methods to the cyclic Bessel I, J, K and Y functions. Also taken great care to avoid spurious over and underflow of these functions. Fixes issue #5560.
- Added an example of using Inverse Chi-Squared distribution for Bayesian statistics, provided by Thomas Mang.
- Added tests to use improved version of lexical_cast which handles C99 nonfinites without using global facets.
- Corrected wrong out-of-bound uniform distribution CDF complement values #5733.
- Enabled long double support on OpenBSD (issue #6014).
- Changed nextafter and related functions to behave in the same way as other implementations - so that nextafter(+INF, 0) is a finite value (issue #5832).
- Changed tuple include configuration to fix issue when using in conjunction with Boost.Tr1 (issue #5934).
- Changed class eps_tolerance to behave correctly when both ends of the range are zero (issue #6001).
- Fixed missing include guards on prime.hpp (issue #5927).
- Removed unused/undocumented constants from constants.hpp (issue #5982).
- Fixed missing std:: prefix in nonfinite_num_facets.hpp (issue #5914).
- Minor patches for Cray compiler compatibility.
MSM:
- eUML: added easier event reprocessing: process(event_) and reprocess()
- Rewrite of internal transition tables. There were a few bugs (failing recursivity in internal transition tables of sub-sub machines) and a missing feature (unused internal transition table of the main state machine).
- Bugfixes
  - Reverted favor_compile_time policy to Boost 1.46 state
  - none event now is convertible from any other event
  - eUML and pseudo exit states
  - Fixed not working Flag_AND
  - Fixed rare bugs causing multiple processing of the same event in a submachine whose transition table contains this event and a base event of it.
  - gcc warnings about unused variables
- Breaking change: the new internal transition table feature causes a minor breaking change. In a submachine, the "Fsm" template parameter for guards / actions of an internal table declared using internal_transition_table now is the submachine, not the higher-level state machine. Internal transitions declared using internal rows in the higher-level state machine keep their behavior (the "Fsm" parameter is the higher-level state machine). To sum up, the internal transition "Fsm" parameter is the closest state machine containing this transition.
Numeric.Conversion:
- Added numeric_cast_traits; see 'numeric_cast_traits' for details.
Proto:
- Breaking Change: Reduce numbers of operator overloads by using rvalue references on compilers that support them. Any user code that defines additional operator overloads on Proto expressions could potentially be rendered ambiguous by this change. The solution is to use a grammar to disable Proto's operators that are made ambiguous by any user-defined operators.
- Move definitions of Proto tag types into an ADL-blocking namespace.
- Add second template parameter to proto::siwtch_ to control dispatching to cases.
- Allow dependent domains to be specified with BOOST_PROTO_EXTENDS and BOOST_PROTO_BASIC_EXTENDS.
Regex:
- Fixed issues: #698, #5835, #5958, #5736.
Spirit:
- Spirit V2.5.1, see the 'What's New' section for details.
TypeTraits:
- Extension to support operator detection.
Unordered:
- Improved support for the C++11 standard - breaking change to equality and emplace.
- Use Boost.Move to implement move semantics.
- See the change log for full details.
Wave:
- See the Changelog for details.

Compilers Tested

Boost's primary test compilers are:

Linux:
- LLVM Clang 2.8
- GCC: 3.4.6, 4.2.4, 4.3.4, 4.4.3, 4.5.1, 4.5.2, 4.6
- GCC, C++0x mode: 4.3.4, 4.4.3, 4.5.2
- Intel 11.1
OS X:
- Intel 11.1
- GCC: 4.2.1, 4.4.4
- GCC, C++0x mode: 4.4.4
Windows:
- Visual C++ 8.0, 9.0, 10.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.4, 4.6.1
FreeBSD:
- GCC 4.2.1, 32 and 64 bit.
QNX:
- QCC 4.4.2
- QCC, C++0x mode: 4.4.2, 4.6.1

Boost's additional test compilers include:

Linux:
- Clang from subversion, with libc++ and GNU libstdc++
- LLVM Clang 2.8 x
- GCC: 3.4.6, 4.2.4, 4.3.4, 4.4.4, 4.5.2, 4.5.4, 4.6.1, 4.6.2
- GCC, C++0x mode: 4.3.4, 4.4.3, 4.4.4, 4.5.2
- pgCC: 11.2 x
- Intel: 10.1, 11.1, 12.0
- PathScale: 4.0.8
- Visual Age 10.1
OS X:
- Clang from subversion, with libc++ and GNU libstdc++.
- Intel 11.1.
- GCC: 4.2.1, 4.4.4.
- GCC, C++0x mode: 4.4.4.
Windows:
- Visual C++ 8.0, 9.0, 10.0
- Visual C++ with STLport: 9.0
- Visual C++, Windows Mobile 5, with STLport: 9.0
- GCC, mingw: 4.4.0, 4.4.7, 4.5.2, 4.5.4, 4.6.1
- GCC, C++0x mode, mingw: 4.5.2
- GCC, mingw 64-bit: 4.7.0
AIX:
- IBM XL C/C++ Enterprise Edition, V11.1.0.0
FreeBSD:
- GCC 4.2.1, 32 and 64 bit.
Solaris:
- Sun 5.10

Acknowledgements

Beman Dawes, Eric Niebler, Rene Rivera, Daniel James and Vladimir Prus managed this release.