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Prior Release (1.82.0)

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What's new in 1.82.0

  • New libraries

    Introduces Mysql, a C++11 client for MySQL built on Asio.

  • Performance improvements

    atomic<T>::value() now uses AVX for 128‑bit loads, and string hash_value gains speed via mulxp1_hash.

  • Dependencies

    Added 4 dependencies across 3 libraries; removed 17 dependencies across 10 libraries.

  • Security & reliability

    Fixed deadlock in thread pool join, dangling references in execution context, and SMBv1 path attribute handling.

  • Developer experience

    New core/snprintf.hpp, core::launder, and url::format improve portability and error messages.

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boost_1_82_0.zip
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boost_1_82_0-bin-msvc-all-32-64.7z
boost_1_82_0-msvc-10.0-32.exe
boost_1_82_0-msvc-10.0-64.exe
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boost_1_82_0-msvc-14.3-64.exe
Release notes version 1.82.0

Version 1.82.0

April 14th, 2023 03:08 GMT

Documentation

Known Issues

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

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

Notice of Dropping C++03 Support

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

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

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

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

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

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

New Libraries

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

Updated Libraries

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

Updated Tools

Compilers Tested

Boost's primary test compilers are:

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

Acknowledgements

Marshall Clow and Glen Fernandes managed this release.

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