Open-(multi-)methods in C++17 and above, from Jean-Louis Leroy.

Added the execution::inline_exception_handling property to describe what exception handling guarantees are made when execution occurs inline.

Added inline_executor, which always executes the submitted function inline.

Changed the default candidate executor for associated_executor from system_executor to inline_executor.

Added the inline_or_executor<> adapter and inline_or() helper, which will execute inline if possible and otherwise delegate to another executor.

Added overloads of dispatch, post and defer that take a function object to be run on the target executor, and deliver the result to the completion handler.

Added the redirect_disposition completion token adapter, as a generic counterpart for redirect_error.

Annotated deprecated items with the [[deprecated]] attribute.

Added a new configuration parameter "reactor" / "reset_edge_on_partial_read", which determines whether a partial read consumes the edge when using epoll.

Added new configuration parameters "reactor" / "use_eventfd" and "reactor" / "use_timerfd" that are used to determine whether the epoll backend uses eventfd and timerfd respectively.

Added the missing preprocessor check for BOOST_ASIO_DISABLE_TIMERFD.

Implemented a compile-time feature check for std::source_location support, in addition to std::experimental::source_location.

Stopped using the deprecated boost::array::c_array() function.

Fixed a resource leak in asio::awaitable move assignment.

Fixed a memory leak in ssl stream move assignment.

Fixed a thread sanitizer issue in kqueue reactor.

Fixed handler tracking arguments in io_uring backend.

Fixed an unused parameter warning in boost::asio::detail::null_thread.

Changed the macro-based coroutine implementation to ensure deterministic case labels when __COUNTER__ is used.

Fixed synchronous SSL stream shutdown to remap error::eof as async_shutdown does.

Changed stream_file and random_access_file on Windows to treat file paths as UTF-8 encoded strings.

Added checks to experimental::parallel_group and experimental::ranged_parallel_group to detect empty operation sets.

Removed workaround for _FORTIFY_SOURCE, added address length checking to ip::basic_resolver_results.

Fixed experimental::coro to have protection against max as a macro.

Updated detection of std::aligned_alloc for newer libc++ versions.

Various documentation fixes and improvements.

Consult the boost_at:/doc/libs/1_90_0/doc/html/boost_asio/history.html[Revision History] for further details.

http::parser rejects non-standard trailer fields by default.

http::basic_parser uses a dedicated callback for trailer fields.

http::field constants are updated.

Fixed allocator move/copy assignment in flat_buffer and multi_buffer.

Fixed websocket permessage-deflate error on partial message consumption.

http::buffer_body ignores empty chunks.

Added http::basic_fields::contains member function.

Removed dependency on Boost.Preprocessor and Boost.StaticAssert.

Added bulk-mode insertion and lookup for increased performance.

Made lookup implementation branchless for block, fast_multiblock32 and fast_multiblock64, which results in some performance gains, particularly for mixed successful/unsuccessful queries.

Fixed quadmath detection in CMake for cross-compilation.

Fixed an issue where a sufficiently big buffer would error as not large enough in floating point to_chars.

Added to_underlying.hpp (contributed by Braden Ganetsky.)

Reimplemented deque. The original implementation was based on the SGI’s original data structure (similar to libstdc++). Main changes:

Fixed bugs/issues:

Dropped dependency on Boost.SmartPtr.

The implementation of BOOST_TEST_THROWS and BOOST_TEST_NO_THROW macros defined in boost/core/lightweight_test.hpp has been changed to avoid compiler warnings on some compilers, when the macros are used in if/else blocks. As a side effect of this change, the semicolon after the macro is now necessary. (PR#205)

boost::data and boost::size are now aliases for std::data and std::size, respectively, when the latter are provided by compiler. This resolves potential ambiguities when both boost:: and std:: alternatives are found by the compiler, e.g. as a result of ADL. (PR#206)

Fixed issues with std::error_code being passed to boost::system::error_code&. Many thanks to Thomas Klausner for the fix (PR#106).

Fixed install with CMake. Many thanks to Yury Bura for the fix (PR#103).

Fixed size variable shadowing.

Added C++20 iterators.

Allowed choosing the underlying container type.

Added constexpr support when compiling as C++20 or later.

Made push_back(), pop_back() and lowest_bit() more efficient.

Made the constructor from basic_string explicit.

Removed several dependencies.

Added push_front(), pop_front(), find_first_off(), find_next_off() and constructors from C-style strings and basic_string_view (the latter in C++17 or later).

Changed the stream inserter to set badbit if an exception is thrown during output.

Made the stream extractor rethrow any exception coming from the underlying vector.

Ported the documentation to MrDocs and Antora.

Clear passed error_code argument on successful completion of the permissions operation. (PR#338)

On Windows, added a workaround for directory_iterator constructor failing with an "Invalid Signature" error for a Samba 3.0.2 share, when SMB signing is required. (#334)

Fixed compile errors in Clang 19 and later due to P0522R0 support.

Major improvements

Improvements

Solved issues

Improvements

Solved issues

Minor documentation fixes.

Fixed bugs:

Removed dependencies on Boost.Align and Boost.StaticAssert.

Switched to a faster hashing algorithm.

More tests and fixes for floating-point special value conversions to integers and bool. Fixes compiler warning C4804 when lexical casting from float to bool.

Dropped dependency to Boost.TypeTraits. Many thanks to Romain Geissler for implementing the major part of the work (PR#87).

Switch from implicit to explicit type conversion to avoid compiler warnings. Many thanks to bmagistro for the PR (PR#85).

Fixed mistakes in documentation. Many thanks to ivanpanch for the PR (PR#86).

Fixed regression in unsigned short to wstring casting without wchar_t builtin type.

Fixed B2 build files to avoid building dynamic versions of various Boost libraries when only static ones are requested (PR#266).

When ISO8859-1 or ISO8859-8 encoding is requested, allow using Windows codepages 1252 or 1255, respectively, instead of using the "C" (classic) locale when the selected Windows locale doesn’t support that ISO8859 encoding.

Enabled a workaround for an issue in Cygwins stdlib when converting some long UTF-8 sequences to UTF-16.

Fixed a missed optimization in value_ref visitation.

Fixed a possible long and useless loop on log file rotation in text_file_backend. If the log file name pattern did not include a file counter and the log file size exceeded the rotation_size limit, then the sink backend would repeatedly try to open a new log file with a different counter value and end up opening the same file every time. (#252)

Made file size checks more robust against integer overflows in text_file_backend.

Added new sub-library: Reverse-Mode Automatic Differentiation.

Added new constant: log_pi.

Added proper promotion policy support to logit, logistic_sigmoid, and logistic distributions.

Numerous fixes and edge case repairs to the special functions.

Updated mp_reverse_fold to work on fixed size lists

Removed dependency on Boost.Spirit.

Auto-reconnection now triggers on any transport-layer error instead of a limited whitelist (#38).

Added at_transport_error callback to the Logger interface.

Refurbished and updated the documentation to use Antora.

Added a new back-end backmp11 offering heavily reduced compile times, a refactored API and a couple of new features. Requires C++17, more details are available in the documentation.

Fixed bug GitHub #87: "boost::any stopped working as Kleene event in 1.86 in boost::msm".

Significant improvements to testing and coverage of newer cpp_double_fp_backend.

Deprecated support for Clang versions older than 4.0. These compilers might still work, but they won’t be actively tested in CI.

Added tests to guarantee compatibility with MySQL 9.x.

Added tests to guarantee compatibility with Clang versions up to 20, and GCC versions up to 15.

Fixed ill-formedness when using move-only callables with closures (PR#284)

Fix wonky const-incompatibility in GlobalState parser template params (#250).

Fix ill-formedness in some cases when using the permutation parser (#268).

Fixed an error in sequence parsing that could cause some attributes to be overwritten by later parsers in a sequence (#279).

Fix the handling of opt-parsers that could leave a std::optional attribute containing a value even though the parser that produced it failed (#279 and #285).

Multiple runtime optimizations (#245, PR#254, PR#255, PR#256).

A modest compile-time and code size optimization (#250).

Make transform constexpr (PR#275).

Move-versus-forward warning mitigation (#272).

Correct the documentation for the attribute type of the if_ directive (#278).

Correct many, many typos in the docs (PR#271).

Added an implementation based on C++26 destructuring into a pack, that fixes majority of known limitations of the library and avoids excessive template instantinations. The new implementation can be explicitly enabled/disabled by a new BOOST_PFR_USE_CPP26 macro. Many thanks to Jean-Michaël Celerier for the PR (PR#194).

Multiple fixes to CMake. Many thanks to Alexander Grund for the PRs!

Fix for construction of xoshiro family of generators from SeedSeq.

Important changes to cancellation:

Added support for custom setup requests using config::setup. When setting these fields, users can replace the library-generated HELLO request by any other arbitrary request. Issue #302 and pull request PR#303.

Deprecated request::config::hello_with_priority. If you need to execute a request before any other, use config::setup, instead. Pull request PR#305.

Valkey long-term support: we guarantee Valkey compatibility starting with this release. Issue #296.

Added a request::append() function, to concatenate request objects. Issue #341.

The health checker algorithm has been redesigned to avoid false positives under heavy loads. PING commands are now only issued when the connection is idle, instead of periodically. Issue #104.

Added config::read_buffer_append_size, which allows to control the expansion of the connection’s read buffer. Pull request PR#283.

Added usage::bytes_rotated, which measures data copying when reading and parsing data from the server. Pull request PR#311.

Bug fixes:

The functionality enabled by the deprecated macros BOOST_SP_ENABLE_DEBUG_HOOKS, BOOST_SP_USE_STD_ALLOCATOR, and BOOST_SP_USE_QUICK_ALLOCATOR has been removed.

The header <boost/smart_ptr/detail/quick_allocator.hpp> has been marked deprecated and will be removed in a future release.

Configurations that define BOOST_NO_CXX11_HDR_ATOMIC are no longer supported; a conforming C++11 <atomic> is now required.

The deprecated macros BOOST_AC_USE_SPINLOCK, BOOST_AC_USE_PTHREADS, BOOST_SP_USE_SPINLOCK, and BOOST_SP_USE_PTHREADS are no longer functional.

Platform-specific implementations of atomic_count, sp_counted_base and spinlock are no longer used and have been removed.

Configurations that define BOOST_NO_CXX11_HDR_MUTEX are no longer supported; a conforming C++11 <mutex> is now required.

Some unused headers in boost/smart_ptr/detail/ have been removed.

Fixed missing include. Thanks to Orgad Shaneh for the fix!

Fixed URL in libbacktrace_impls.hpp, thanks to Jonathan Wakely.

Aligned to_static_[w]string() with std::to_[w]string() in C++26.

Removed usage of an additional buffer in to_static_[w]string().

Added resize_and_overwrite().

Fixed ill-formedness with GCC 14 (PR#80).

Fixed ill-formedness when using move-only callables with closures.

Fixed a few warnings on Windows Clang.

Dropped dependency on Boost.Core.

Run all the tests in CMake too, Many thanks to Alexander Grund for some fixes and help.

segments_view and segments_encoded_view gained constant-time iterator-based subview constructors.

Added zone-id setters (e.g. for IPv6 link-local addresses).

Host setters now accept/propagate zone-id.

Fixed: resolve now replicates the reference fragment in all cases (#920).

Fixed: encoded_host_address assertions account for zone-id.

Refactor: replaced BOOST_STATIC_ASSERT with BOOST_CORE_STATIC_ASSERT (#934).

Refactor: preserved absolute semantics for segment subviews (#939).

string_generator is now constexpr on C++14 and higher.

Added header boost/uuid/constants.hpp.

Renamed boost/uuid/uuid_generators.hpp to boost/uuid/generators.hpp. The old name is retained for compatibility.

More functions have been marked as constexpr, including ~variant. This didn’t matter before C++20, but does now.

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

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

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