New Libraries

• Cobalt: Basic algorithms and types for C++20 coroutines, from Klemens Morgenstern.
• Redis: Redis async client library built on top of Boost.Asio, from Marcelo Zimbres Silva.

Updated Libraries

• Any:

  • C++03 is no longer supported PR#26.
  • Fixed reference documentation generation. Now it is not overwritten by Boost.PFR reference. Thanks to Peter Dimov for the debugging.
• Chrono:

  • C++03 is no longer supported.
• ContainerHash:

  • C++03 is no longer supported.
• Conversion:

  • C++03 is no longer supported PR#27.
• CRC:

  • C++03 support is deprecated and will be removed in release 1.86.
• DLL:

  • C++03 is no longer supported PR#66.
• Endian:

  • C++03 is no longer supported.
• Heap:

  • C++03 support is deprecated and will be removed in release 1.86. New requirement will be C++14.
• LEAF:

  • class result<T> marked nodiscard.
  • Added member typedef result<T>::value_type.
  • verbose_diagnostic_info defers conversion to string until an error handling scope is reached.
  • Improved support for embedded development.
  • Improved Visual Studio 2015 compatibility (thanks godmaycrying).
  • Minor bug fixes an improvements.
  • Dropped support for GCC 4.8 and 4.9.
• LexicalCast:

  • C++03 is no longer supported PR#62.
  • Fixed -Wdeprecated-copy-with-dtor warnings with clang. Thanks to Romain Geissler for the PR PR#59!
  • Dropped dependency on Boost.Range PR#63.
• Lockfree:

  • C++03 support is deprecated and will be removed in release 1.86. New requirement will be C++14.
• Multi-index Containers:

  • Fixed a serialization-related compile-time bug in old compilers without ADL support (issue #70).
• MySQL:

  • Added connection::reset_connection and connection::async_reset_connection. These functions clean session state (including prepared statements, variables, locks and more) without closing and re-opening the connection.
  • Added error codes introduced in MySQL server v8.1.0.
  • Added fuzz testing for the deserialization functions.
• PFR:

  • Big new feature: field names reflection. Added new constexpr boost::pfr::get_name<N, T>() function that returns a std::string_view with a name of field at index N of an aggregate T. Requires C++20. BOOST_PFR_CORE_NAME_ENABLED is defined to 1 if the functionality is available. Many thanks to Denis Mikhailov, Bela Schaum and X-Ryl669 for the PR PR#129 and implementation ideas.
  • for_each_field() is now constexpr for C++17. Many thanks to Alexander Karatarakis for the PR PR#134.
• Predef:

  • Version 1.15.0
  • Add detection of Microsoft STL (from Henrik Gaßmann).
• Ratio:

  • C++03 is no longer supported.
  • Support for BOOST_RATIO_EXTENSIONS has been removed. Ratio is now implemented in terms of the standard <ratio> header.
• Stacktrace:

  • C++03 is no longer supported. Thanks to Alex for the PR PR#139
  • Fixed addr2line for pie binaries. Thanks to ja2142 for the PR PR#138!
  • Fixed build with MinGW-w64 12+. Thanks to yhsb2k for the PR PR#140!
  • Added missing include. Thanks to Francesco Ballarin for the PR PR#143!
• System:

  • Added support for result<U&, E>.
  • Added operator| for result.
  • Added operator& for result.
  • Added operator&= for result.
• Thread:

  • C++03 is no longer supported.
• TypeIndex:

  • C++03 is no longer supported.
  • BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS((A)(B)(C)(D)) changed syntax to BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS(A, B, C, D).
  • Dropped Boost.PP dependency.
• TypeOf:

  • C++03 is no longer supported.
• Unordered:

  • Major update.
  • Added boost::concurrent_flat_set.
  • Added [c]visit_while operations to concurrent containers, with serial and parallel variants.
  • Added efficient move construction of boost::unordered_flat_(map|set) from boost::concurrent_flat_(map|set) and vice versa.
  • Added bulk visitation to concurrent containers for increased lookup performance.
  • Added debug-mode mechanisms for detecting illegal reentrancies into a concurrent container from user code.
  • Added Boost.Serialization support to all containers and their (non-local) iterator types.
  • Added support for fancy pointers to open-addressing and concurrent containers. This enables scenarios like the use of Boost.Interprocess allocators to construct containers in shared memory.
  • Starting with this release, boost::unordered_[multi]set and boost::unordered_[multi]map only work with C++11 onwards.
• variant:

  • C++03 is no longer supported PR#107.
  • Dropped Boost.Move and Boost.Bind dependencies.

Compilers Tested

Boost's primary test compilers are:

Boost's primary test compilers are:

• Linux:

  • Clang, C++03: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
  • GCC, C++03: 4.6.3, 11, 12
  • GCC, C++11: 4.7.3, 4.8.5, 11, 12
  • GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11, 12
  • GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11, 12
  • GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
• OS X:

  • Apple Clang, C++03: 11.0.3
  • Apple Clang, C++11: 11.0.3
  • Apple Clang, C++14: 11.0.3
  • Apple Clang, C++17: 11.0.3
  • Apple Clang, C++20: 11.0.3
• Windows:

  • Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2, 14.3

Acknowledgements

Marshall Clow and Glen Fernandes managed this release.