Release notes for work in progress boost

Version 1.59.0

In Progress

New Libraries

TODO

Updated Libraries

Multi-index Containers:
- Added ranked indices.
- Maintenance fixes.
TODO

Compilers Tested

Boost's primary test compilers are:

TODO

Boost's additional test compilers include:

TODO

Acknowledgements

TODO

Version 1.58.0

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

Known Issue

Boost.Python will fail to build if it is complied agains 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<U> 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<U>(VariantT) and boost::polymorphic_get<U>(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.