Release notes for work in progress boost

Version 1.62.0

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

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
Coroutine2:
- #12221 coroutine<>::push_type function starts without pushing
- do not swallow exceptions thrown at coroutine<>::push_type construction
Functional/Forward:
- Fix C++11 compile error.
TODO

Compilers Tested

Boost's primary test compilers are:

TODO

Boost's additional test compilers include:

TODO

Acknowledgements

TODO

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<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.