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<channel>
<generator>Boost Website Site Tools</generator>
<title>Release notes for work in progress boost</title>
<link>https://www.boost.org/</link>
<atom:link href="https://www.boost.org/generated/dev.rss" rel="self" type="application/rss+xml" />
<description></description>
<language>en-us</language>
<copyright>Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or https://www.boost.org/LICENSE_1_0.txt)</copyright>
<item><title>Version 1.79.0</title><link>https://www.boost.org/users/history/version_1_79_0.html</link><guid>https://www.boost.org/users/history/version_1_79_0.html</guid><pubDate>Wed, 13 Apr 2022 14:22:59 +0000</pubDate><description>
&lt;div id="version_1_79_0.known_issues"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Known Issues&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
These are patches from library authors which were found too late to be fixed
in the release.
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Boost.JSON &lt;code&gt;&lt;span class="identifier"&gt;array&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;erase&lt;/span&gt;&lt;/code&gt; can segfault, see &lt;a href="https://github.com/boostorg/json/issues/692"&gt;#692&lt;/a&gt;.
&lt;a href="https://www.boost.org/patches/1_79_0/0001-json-array-erase-relocate.patch"&gt;Patch&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_79_0.new_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;New Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
No new libraries.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_79_0.updated_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/asio/"&gt;Asio&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;bind_allocator&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;file_base&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;sync_all_on_write&lt;/span&gt;&lt;/code&gt; flag.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added missing implementation of &lt;code&gt;&lt;span class="identifier"&gt;basic_file&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;release&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added per-operation cancellation support to signal sets.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Exposed &lt;code&gt;&lt;span class="identifier"&gt;recycling_allocator&lt;/span&gt;&lt;/code&gt;
as part of the public interface.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;nodiscard&lt;/span&gt;&lt;/code&gt;
attribute to a number of functions.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added OpenSSL 3.0 compatibility.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for adopting an existing &lt;code&gt;&lt;span class="identifier"&gt;SSL&lt;/span&gt;&lt;span class="special"&gt;*&lt;/span&gt;&lt;/code&gt; into an &lt;code&gt;&lt;span class="identifier"&gt;ssl&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stream&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enabled &lt;code&gt;&lt;span class="identifier"&gt;executor_work_guard&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt; in all build configurations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enabled movable socket iostreams when using clang.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;bind_cancellation_slot&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;bind_executor&lt;/span&gt;&lt;/code&gt;
compatibility with legacy completion tokens.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;associator&lt;/span&gt;&lt;/code&gt;
specialisations for &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;append&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;prepend&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;associated_allocator&lt;/span&gt;&lt;/code&gt;
primary template.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;tt&gt;io_uring&lt;/tt&gt; implementations of &lt;code&gt;&lt;span class="identifier"&gt;async_receive_from&lt;/span&gt;&lt;/code&gt; for sockets
and &lt;code&gt;&lt;span class="identifier"&gt;write_some_at&lt;/span&gt;&lt;/code&gt;
for files.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;tt&gt;io_uring&lt;/tt&gt; feature detection.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;coro&lt;/span&gt;&lt;/code&gt;'s
per-operation cancellation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed memory management in &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;promise&lt;/span&gt;&lt;/code&gt;'s
type-erased completion handlers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed move &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;=&lt;/span&gt;&lt;/code&gt; implementation for &lt;code&gt;&lt;span class="identifier"&gt;ssl&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stream&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;any_io_executor&lt;/span&gt;&lt;/code&gt;
implementation to work when both &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ASIO_SEPARATE_COMPILATION&lt;/span&gt;&lt;/code&gt;
are defined.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed implementation of &lt;code&gt;&lt;span class="identifier"&gt;basic_socket&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;at_mark&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; when using the &lt;code&gt;&lt;span class="identifier"&gt;sockatmark&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; system call.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed the recycling allocator to use the default alignment as the
minimum alignment for allocations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for apparent coroutine codegen bug with Apple's
clang.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, changed the file support to open files using the same
sharing mode as &lt;code&gt;&lt;span class="identifier"&gt;fopen&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Linux, fixed UNIX domain sockets implementation to correctly handle
&lt;code&gt;&lt;span class="identifier"&gt;EAGAIN&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed implementation of &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_channel&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;reset&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_concurrent_channel&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;reset&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed potential undefined behaviour in the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;promise&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed the &lt;code&gt;&lt;span class="identifier"&gt;co_spawn&lt;/span&gt;&lt;/code&gt;
implementation to dispatch cancellation signals through the executor
in some circumstances.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed various header inclusion issues.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed various warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
A number of documentation enhancements, including:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added an overview of Asio's asynchronous model.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reworked reference and requirements documentation in terms
of asynchronous model.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated documentation for &lt;code&gt;&lt;span class="identifier"&gt;dispatch&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;post&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, and &lt;code&gt;&lt;span class="identifier"&gt;defer&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Documented per-operation cancellation for serial ports.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clarified the non-concurrency guarantees made for allocators.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reverted the &lt;code&gt;&lt;span class="identifier"&gt;io_context&lt;/span&gt;&lt;/code&gt;
reference documentation to use &lt;code&gt;&lt;span class="identifier"&gt;executor_work_guard&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added more detailed reference documentation to &lt;code&gt;&lt;span class="identifier"&gt;make_strand&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;make_work_guard&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;address_v4&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;address_v6&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_channel&lt;/span&gt;&lt;/code&gt;, and &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_concurrent_channel&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Re-arranged and extended the Overview documentation to cover
recently added features.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a C++11 example showing file descriptor passing over local
sockets.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added C++14 examples of wrapping callback-based APIs in asynchronous
operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Consult the &lt;a href="https://www.boost.org/doc/libs/1_79_0/doc/html/boost_asio/history.html"&gt;Revision
History&lt;/a&gt; for further details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/assert/"&gt;Assert&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;span class="special"&gt;().&lt;/span&gt;&lt;span class="identifier"&gt;file_name&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;span class="special"&gt;().&lt;/span&gt;&lt;span class="identifier"&gt;function_name&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; now return &lt;code&gt;&lt;span class="string"&gt;""&lt;/span&gt;&lt;/code&gt;
instead of &lt;code&gt;&lt;span class="string"&gt;"(unknown)"&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a &lt;code&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;/code&gt;
constructor from &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed &lt;code&gt;&lt;span class="identifier"&gt;BOOST_CURRENT_LOCATION&lt;/span&gt;&lt;/code&gt;
to more closely match the behavior of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;current&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, such as being usable at top level
or as a default function argument.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/atomic/"&gt;Atomic&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation for Universal Windows Platform (UWP). (&lt;a href="https://github.com/boostorg/atomic/issues/54"&gt;#54&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ATOMIC_NO_DARWIN_ULOCK&lt;/span&gt;&lt;/code&gt;
configuration macro. The macro affects compilation on Darwin systems
and disables &lt;code&gt;&lt;span class="identifier"&gt;ulock&lt;/span&gt;&lt;/code&gt;-based
implementation of waiting and notifying operations. This may be useful
to comply with Apple App Store requirements. (&lt;a href="https://github.com/boostorg/atomic/issues/55"&gt;#55&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added missing include for file_body test.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed WebSocket handshake response on failure.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed open append mode for &lt;code&gt;&lt;span class="identifier"&gt;file_posix&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;file_win32&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed file open with append/append_existing flag on Windows
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed clang-cl UTF8 path handling for &lt;code&gt;&lt;span class="identifier"&gt;file_win32&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;file_stdio&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added ARM64 builds to drone CI.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed async_base documentation link.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added tests for file open in append/append_existing mode.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated CI to include gcc 11, clang 12, msvc 14.3.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added individual tests to CMake workflow.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
We'd love to know how you or your company use Beast, consider adding
an entry to the &lt;a href="https://github.com/boostorg/beast/wiki/Companies-and-Individuals-Using-Beast"&gt;Companies
and Individuals Using Beast&lt;/a&gt; list.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/beast/doc/html/beast/release_notes.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/core/"&gt;Core&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Made &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;pointer_traits&lt;/span&gt;&lt;/code&gt; SFINAE friendly,
addressing LWG3545. (Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;allocator_traits&lt;/span&gt;&lt;/code&gt; that uses the
individual allocator access traits. This implementation supports
C++03 and above. (Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated the allocator access traits to support most of the C++11
allocator model in C++03. (Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt; is deprecated and will be removed
in a future release. The header defines &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt;
template, which is equivalent to &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt;
in &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; header. However, since &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt; is itself deprecated in
C++17, users are advised to remove &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt;
or &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt; use from their code.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;verbose_terminate_handler&lt;/span&gt;&lt;/code&gt;, a utility
function intended to be passed to &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;set_terminate&lt;/span&gt;&lt;/code&gt;
that prints information about the uncaught exception to &lt;code&gt;&lt;span class="identifier"&gt;stderr&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/describe/"&gt;Describe&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Enabled unions in &lt;code&gt;&lt;span class="identifier"&gt;BOOST_DESCRIBE_STRUCT&lt;/span&gt;&lt;/code&gt;
and updated examples to check &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;is_union&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added example of defining a &lt;code&gt;&lt;span class="identifier"&gt;fmtlib&lt;/span&gt;&lt;/code&gt;
class formatter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added example of defining a &lt;code&gt;&lt;span class="identifier"&gt;fmtlib&lt;/span&gt;&lt;/code&gt;
enum formatter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added example of printing pointers to members.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v3:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;replace_extension&lt;/span&gt;&lt;/code&gt;
now works in terms of &lt;strong&gt;v3&lt;/strong&gt; definition
of &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;extension&lt;/span&gt;&lt;/code&gt; rather than &lt;strong&gt;v4&lt;/strong&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation of path appending and concatenation operators with
arguments of types convertible to &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;/code&gt;
or compatible string type. (&lt;a href="https://github.com/boostorg/filesystem/issues/223"&gt;#223&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On POSIX systems that support &lt;code&gt;&lt;span class="identifier"&gt;fdopendir&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;O_NOFOLLOW&lt;/span&gt;&lt;/code&gt; and
on Windows, &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt;
is now protected against &lt;a href="https://www.cve.org/CVERecord?id=CVE-2022-21658"&gt;CVE-2022-21658&lt;/a&gt;.
The vulnerability is a race condition that allows a third party process
to replace a directory that is being concurrently processed by &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt; with a directory symlink
and cause &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt;
to follow the symlink and remove files in the linked directory instead
of removing the symlink itself. (&lt;a href="https://github.com/boostorg/filesystem/issues/224"&gt;#224&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, in &lt;code&gt;&lt;span class="identifier"&gt;remove&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt; implementation,
use POSIX semantics for file removal, when supported by the OS (Windows
10 1709 and later). When POSIX semantics is supported, the file name
is removed from the filesystem namespace as soon as the file is marked
for deletion, even if it is still open and in use. With legacy Windows
semantics, the file name remains present in the the filesystem namespace
until the last file handle to the file is closed, which allows the
file marked for deletion to be opened and prevents creating new files
with the same name. (&lt;a href="https://github.com/boostorg/filesystem/issues/216"&gt;#216&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;remove&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt; now
support deleting read-only directories. Support for removing read-only
non-directory files was added previously.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;directory_iterator&lt;/span&gt;&lt;/code&gt;
internal implementation has been reworked to better utilize modern
Windows APIs, which may improve performance while handling symlinks.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, initialize internal WinAPI function pointers early, if
possible, to allow Boost.Filesystem operations to be invoked in global
constructors. This is only supported on MSVC, GCC, Clang and compatible
compilers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;resize_file&lt;/span&gt;&lt;/code&gt;
should no longer fail with an error if the file to be resized is
opened.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Disabled use of the &lt;code&gt;&lt;span class="identifier"&gt;statx&lt;/span&gt;&lt;/code&gt;
syscall on Android prior to 11.0 (API version 30). The syscall is
blacklisted by seccomp and causes process termination in runtime.
(&lt;a href="https://github.com/boostorg/filesystem/issues/229"&gt;#229&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Deprecated:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;filesystem&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;string_file&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
header is deprecated and will be removed in a future release. The
header is no longer included by &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;filesystem&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
by default. Users are advised to implement the functionality themselves
or migrate to other implementations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Deprecated:&lt;/strong&gt; Windows CE support is
deprecated and will be removed in a future release. Windows CE has
been untested for many years and is likely non-functional.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/geometry/"&gt;Geometry&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Major change
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/977"&gt;PR#977&lt;/a&gt; Rescaling is turned off by default. This avoids
many related bugs in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improvements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/961"&gt;PR#961&lt;/a&gt; Added Web Mercator projection.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/966"&gt;PR#966&lt;/a&gt; More efficient cartesian distance strategy
used in simplify.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Solved issues
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/956"&gt;#956&lt;/a&gt; Result of simplify algorithm with incorrect
closure.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/962"&gt;#962&lt;/a&gt; Runtime error in R-tree deserialization due
to load factor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/971"&gt;#971&lt;/a&gt; R-tree insertion time impacted by use of long
double on ARM platforms.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bugfixes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/936"&gt;PR#936&lt;/a&gt; Envelope of polygon containing pole.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/948"&gt;PR#948&lt;/a&gt; Spherical and geographic envelope for near
meridian segments.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/974"&gt;PR#974&lt;/a&gt; Spheroidal normalization utilities for NaN
coordinates.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Various fixes in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/integer/"&gt;Integer&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Optimized &lt;code&gt;&lt;span class="identifier"&gt;integer_log2&lt;/span&gt;&lt;/code&gt;
implementation to use bit operations internally. This allows to employ
bit instructions available on most modern CPUs. (&lt;a href="https://github.com/boostorg/integer/issues/31"&gt;#31&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/io/"&gt;IO&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;io&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_nullbuf&lt;/span&gt;&lt;/code&gt;, a null stream buffer,
and &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_onullstream&lt;/span&gt;&lt;/code&gt;, a null output
stream (Glen Fernandes).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/iterator/"&gt;Iterator&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;counting_iterator&lt;/span&gt;&lt;/code&gt;,
added support for built-in 128-bit integer types supported by gcc
and clang and compatible compilers on some target platforms.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Silenced gcc warnings about deprecated implicit copy assignment operator
in &lt;code&gt;&lt;span class="identifier"&gt;counting_iterator&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/json/"&gt;JSON&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Standalone mode of the library is removed. Users who wish to continue
using standalone JSON can switch to &lt;a href="https://github.com/CPPAlliance/standalone-json.git"&gt;the
C++ Alliance fork&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt; overloads.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;/code&gt; to &lt;code&gt;&lt;span class="identifier"&gt;error_codes&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for JSON Pointer.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Naturally grow string during serialization.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/leaf/"&gt;LEAF&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Support for FreeRTOS and other embedded platforms
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improved diagnostic information
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improved configuration macros
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
BOOST_LEAF_CHECK using statement expressions under __GNUC__
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed symbol demangling bug
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/log/"&gt;Log&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
General changes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;text_file_backend&lt;/span&gt;&lt;/code&gt;,
added support for appending to a previously written log file,
when file rotation is used and log file names use file counters.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Breaking change:&lt;/strong&gt; The &lt;code&gt;&lt;span class="identifier"&gt;file_collector&lt;/span&gt;&lt;/code&gt; interface
has changed:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;scan_for_files&lt;/span&gt;&lt;/code&gt;
method returns a &lt;code&gt;&lt;span class="identifier"&gt;scan_result&lt;/span&gt;&lt;/code&gt;
structure that contains information collected during
the scan;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;is_in_storage&lt;/span&gt;&lt;/code&gt;
method added for testing if a path refers to a file within
the target storage directory.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a new &lt;code&gt;&lt;span class="identifier"&gt;invoke_manip&lt;/span&gt;&lt;/code&gt;
stream manipulator that can be used for injecting user's function
into a stream output expression.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed file counter being set to zero if the user calls &lt;code&gt;&lt;span class="identifier"&gt;text_file_backend&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;scan_for_files&lt;/span&gt;&lt;/code&gt; multiple times,
and the second and the following calls don't find any new files.
(&lt;a href="https://github.com/boostorg/log/issues/179"&gt;#179&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/libs/log/doc/html/log/changelog.html"&gt;changelog&lt;/a&gt;
for more details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/multi_index/"&gt;Multi-index Containers&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Improved the efficiency of &lt;code&gt;&lt;span class="identifier"&gt;count&lt;/span&gt;&lt;/code&gt;
operations in ranked indices from &lt;code&gt;&lt;span class="identifier"&gt;O&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;log&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;n&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt; &lt;span class="special"&gt;+&lt;/span&gt; &lt;span class="identifier"&gt;count&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;O&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;log&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;n&lt;/span&gt;&lt;span class="special"&gt;))&lt;/span&gt;&lt;/code&gt;.
Contributed by Damian Sawicki.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Maintenance work.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/nowide/"&gt;Nowide&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix compilation issues on some platforms (e.g. GCC 11 on MinGW-w64
and Cygwin)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix missing include when using &lt;code&gt;&lt;span class="identifier"&gt;BOOST_USE_WINDOWS_H&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;WIN32_LEAN_AND_MEAN&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add sanity check when using &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;nowide&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stat&lt;/span&gt;&lt;/code&gt;
with &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;nowide&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stat_t&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/optional/"&gt;Optional&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;a href="https://github.com/boostorg/optional/issues/98"&gt;issue
#98&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;a href="https://github.com/boostorg/optional/issues/92"&gt;issue
#92&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for &lt;code&gt;&lt;span class="identifier"&gt;BOOST_NO_IOSTREAM&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Now aligned storage uses &lt;code&gt;&lt;span class="keyword"&gt;unsigned&lt;/span&gt;
&lt;span class="keyword"&gt;char&lt;/span&gt;&lt;/code&gt; rather than &lt;code&gt;&lt;span class="keyword"&gt;char&lt;/span&gt;&lt;/code&gt; to avoid UB.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Now using cv-unqualified &lt;code&gt;&lt;span class="identifier"&gt;value_type&lt;/span&gt;&lt;/code&gt;
with placement &lt;code&gt;&lt;span class="keyword"&gt;new&lt;/span&gt;&lt;/code&gt; to
avoid UB.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/predef/"&gt;Predef&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Version 1.14.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add detection of LoongArch (from Zhang Na).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/qvm/"&gt;QVM&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added constexpr under C++17
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improved single header distribution
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/smart_ptr/"&gt;Smart Pointers&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;get_allocator_pointer&lt;/span&gt;&lt;/code&gt; to obtain
the Allocator pointer from the result of &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;allocate_unique&lt;/span&gt;&lt;/code&gt;
(Glen Fernandes).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added a &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;/code&gt; parameter to &lt;code&gt;&lt;span class="identifier"&gt;throw_exception_from_error&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;throw_exception_from_error&lt;/span&gt;&lt;/code&gt;
overloads for &lt;code&gt;&lt;span class="identifier"&gt;errc&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;errc_t&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;errc&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;exception_ptr&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;result&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;::&lt;/span&gt;&lt;span class="identifier"&gt;value&lt;/span&gt;&lt;/code&gt; now automatically supplies
&lt;code&gt;&lt;span class="identifier"&gt;BOOST_CURRENT_LOCATION&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;throw_exception_from_error&lt;/span&gt;&lt;/code&gt;
via a default argument.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added an &lt;code&gt;&lt;span class="identifier"&gt;errc&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;make_error_code&lt;/span&gt;&lt;/code&gt; overload taking
a source location.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/throw_exception/"&gt;ThrowException&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;throw_with_location&lt;/span&gt;&lt;/code&gt;, a more lightweight
alternative of &lt;code&gt;&lt;span class="identifier"&gt;BOOST_THROW_EXCEPTION&lt;/span&gt;&lt;/code&gt;
for programs that do not use Boost.Exception.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/unordered/"&gt;Unordered&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
All containers have been updated to support heterogeneous &lt;code&gt;&lt;span class="identifier"&gt;count&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;equal_range&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;find&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
All containers now implement the member function &lt;code&gt;&lt;span class="identifier"&gt;contains&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;erase_if&lt;/span&gt;&lt;/code&gt; has been
implemented for all containers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
All containers have been updated to support heterogeneous &lt;code&gt;&lt;span class="identifier"&gt;erase&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;extract&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed behavior of &lt;code&gt;&lt;span class="identifier"&gt;reserve&lt;/span&gt;&lt;/code&gt;
to eagerly allocate.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Various warning fixes in the test suite.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update code to internally use &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;allocator_traits&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Switch to Fibonacci hashing.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update documentation to be written in AsciiDoc instead of QuickBook.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/variant2/"&gt;Variant2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;lt;&lt;/span&gt;&lt;/code&gt;
for &lt;code&gt;&lt;span class="identifier"&gt;monostate&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/wave/"&gt;Wave&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
C++11 now required for building Wave itself
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/135"&gt;#135&lt;/a&gt;: Comma operators in array subscripts are deprecated
in C++20
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/137"&gt;#137&lt;/a&gt;: Simple unknown directive =&amp;gt; found_unknown_directive
is not called, stripped of pound.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/138"&gt;#138&lt;/a&gt;: Empty ifdef block does not emit line directive
for missing whitespace
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/143"&gt;#143&lt;/a&gt;: Parsing __has_include() fails with trailing tokens
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/145"&gt;#145&lt;/a&gt;: Sanitizer complains about reset_version()
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/147"&gt;#147&lt;/a&gt;: bitwise operations between different enumeration
types are deprecated
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_79_0.updated_tools"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Tools&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/tools/build/"&gt;Build&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Includes release of &lt;a href="https://www.boost.org/tools/build/doc/html/#_version_4_8_2"&gt;B2
version 4.8.2&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_79_0.compilers_tested"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Compilers Tested&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost's primary test compilers are:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.4, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++20: 11.0.0, 12.0.0, 13.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.6.3, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++20: 8.0.1, 9.1.0, 10, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++20: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_79_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow, Michael Caisse and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item><item><title>Version 1.78.0</title><link>https://www.boost.org/users/history/version_1_78_0.html</link><guid>https://www.boost.org/users/history/version_1_78_0.html</guid><pubDate>Wed, 08 Dec 2021 03:45:49 +0000</pubDate><description>
&lt;div id="version_1_78_0.known_issues"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Known Issues&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
These are patches from library authors which were found too late to be fixed
in the release.
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Boost.Build silently skips installation of library headers and binaries
in some cases, see &lt;a href="https://github.com/bfgroup/b2/issues/104"&gt;#104&lt;/a&gt;.
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed in &lt;a href="https://github.com/bfgroup/b2/pull/113"&gt;PR#113&lt;/a&gt;,
&lt;a href="https://www.boost.org/patches/1_78_0/0001-b2-fix-install.patch"&gt;patch&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Boost.Atomic fails to build when targeting UWP, see &lt;a href="https://github.com/boostorg/atomic/issues/54"&gt;#54&lt;/a&gt;. &lt;a href="https://www.boost.org/patches/1_78_0/0002-atomic-fix-uwp-build.patch"&gt;Patch&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_78_0.new_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;New Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
No new libraries.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_78_0.updated_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/asio/"&gt;Asio&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added an io_uring backend that may optionally be used for all I/O
objects, including sockets, timers, and posix descriptors.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for files, with new new classes for stream-oriented
and random-access files. This feature currently supports I/O completion
ports on Windows, and io_uring on Linux.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for portable pipes on POSIX and Windows (when I/O completion
ports are available).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for registered buffers, which are optimised when using
the io_uring backend.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added experimental support for channels, that may be used to send
and queue completions as messages.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Implemented improvements to &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;coro&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Disabled &lt;code&gt;&lt;span class="identifier"&gt;aligned_alloc&lt;/span&gt;&lt;/code&gt;
on &lt;tt&gt;clang&lt;/tt&gt; when using an MSVC runtime.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed to use a faster implementation for &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;network_v4&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;canonical&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added template specialisations for common uses to improve compile
time.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reduced the size of &lt;code&gt;&lt;span class="identifier"&gt;io_context&lt;/span&gt;&lt;/code&gt;
executors to a single pointer.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Increased the small object buffer size for &lt;code&gt;&lt;span class="identifier"&gt;execution&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;any_executor&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;any_io_executor&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed multi-signature handling when variadic templates are disabled.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compatibility with new versions of &lt;tt&gt;gcc&lt;/tt&gt; and
&lt;tt&gt;clang&lt;/tt&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation on Solaris.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed defence against Qt-defined macros when building with MSVC.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improved error messages emitted by &lt;code&gt;&lt;span class="identifier"&gt;ssl&lt;/span&gt;&lt;/code&gt;
facilities.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;bind_executor&lt;/span&gt;&lt;/code&gt;
compatibility with completion tokens.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed build errors when &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT&lt;/span&gt;&lt;/code&gt;
is defined.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added missing move assignment operator to &lt;code&gt;&lt;span class="identifier"&gt;awaitable&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed an access violation when using coroutines with MSVC, due to
incorrect alignment of allocated memory.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a cleanup issue in &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;parallel_group&lt;/span&gt;&lt;/code&gt;
that occured when the execution context was shut down with parallel
operations still pending.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added clarifications to the documentation on concurrency hints.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added documentation on error handling techniques for C++20 coroutines.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed various warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Consult the &lt;a href="https://www.boost.org/doc/libs/1_78_0/doc/html/boost_asio/history.html"&gt;Revision
History&lt;/a&gt; for further details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/assert/"&gt;Assert&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;source_location&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;to_string&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/atomic/"&gt;Atomic&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Use process-local futex operations on Android for non-IPC waiting
and notifying operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for Linux targets that only define &lt;code&gt;&lt;span class="identifier"&gt;SYS_futex_time64&lt;/span&gt;&lt;/code&gt;
syscall, such as riscv32.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for incorrect result of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;alignment_of&lt;/span&gt;&lt;/code&gt;
on clang 8 for 64-bit types on 32-bit x86 targets.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a ulock backend for waiting and notifying operations on Darwin
systems since Mac OS 10.12, iOS 10.0, tvOS 10.0 or watchOS 3.0.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, corrected discrepancy between &lt;tt&gt;&lt;em&gt;atomic-type&lt;/em&gt;::always_has_native_wait_notify&lt;/tt&gt;
and the corresponding capability macros when targeting Windows 8
or later. The library will now directly use &lt;code&gt;&lt;span class="identifier"&gt;WaitOnAddress&lt;/span&gt;&lt;/code&gt;
and related APIs from public headers and therefore require user to
link with &lt;code&gt;&lt;span class="identifier"&gt;synchronization&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;lib&lt;/span&gt;&lt;/code&gt;
if the user requires Windows 8 or later by defining &lt;code&gt;&lt;span class="identifier"&gt;BOOST_USE_WINAPI_VERSION&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;_WIN32_WINNT&lt;/span&gt;&lt;/code&gt; or similar macros.
The library is linked automatically on compilers that support auto-linking
(e.g. MSVC).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for types with padding bits, except unions, on compilers
that provide a way to clear the padding bits. This feature is supported
by gcc 11 and MSVC 14.2 (compiler version 19.27) and newer, as well
as other compilers supporting similar intrinsics. On compilers that
don't allow to clear the padding bits, types with padding are still
generally not supported with the exception of 80-bit &lt;code&gt;&lt;span class="keyword"&gt;long&lt;/span&gt; &lt;span class="keyword"&gt;double&lt;/span&gt;&lt;/code&gt;
on x86 targets. A new &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ATOMIC_NO_CLEAR_PADDING&lt;/span&gt;&lt;/code&gt;
capability macro is defined to indicate when clearing the padding
is not supported.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Initializing constructors of &lt;code&gt;&lt;span class="identifier"&gt;atomic_ref&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;ipc_atomic_ref&lt;/span&gt;&lt;/code&gt;
no longer use atomic instructions to clear the padding bits in the
referenced object. This reduces the cost of the atomic reference
construction.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Initializing constructors of &lt;code&gt;&lt;span class="identifier"&gt;atomic&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;ipc_atomic&lt;/span&gt;&lt;/code&gt; are
now &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt; for enums,
classes and floating point types. For classes and floating point
types, the constructors are &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt;
if the compiler supports &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt;
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;bit_cast&lt;/span&gt;&lt;/code&gt;, the type has no padding
bytes and no padding is required to implement native atomic operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In accordance with C++20, default constructors of &lt;code&gt;&lt;span class="identifier"&gt;atomic&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;ipc_atomic&lt;/span&gt;&lt;/code&gt; now
perform value initialization of the contained object. For types without
a user-defined default constructor, this means the default-constructed
atomic will be zero-initialized.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for compilation error on AIX caused by the assembler
tool not supporting numeric labels. (&lt;a href="https://github.com/boostorg/atomic/pull/50"&gt;PR#50&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for compilation error with Visual Studio 2015
prior to Update 3. (&lt;a href="https://github.com/boostorg/atomic/issues/52"&gt;#52&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/doc/html/atomic/changelog.html"&gt;changelog&lt;/a&gt;
for more details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This maintenance update brings minor bug fixes and updated CI reporting.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed security vulnerability CVE-2016-9840 in zlib implementation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed WebSocket permessage_deflate implementation. This should result
in an increase in compression performance when using Beast WebSockets.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed the test stream and test framework's dependency on RTTI.
You can now use our handy test stream to check your embedded asynchronous
communications code!
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
We'd love to know how you or your company use Beast, consider adding
an entry to the &lt;a href="https://github.com/boostorg/beast/wiki/Companies-and-Individuals-Using-Beast"&gt;Companies
and Individuals Using Beast&lt;/a&gt; list.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/beast/doc/html/beast/release_notes.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/core/"&gt;Core&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added a generic implementation to &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;cmath&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;,
enabled when &lt;code&gt;&lt;span class="identifier"&gt;BOOST_CORE_USE_GENERIC_CMATH&lt;/span&gt;&lt;/code&gt;
is defined or when the platform does not provide the necessary facilities
in &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;cmath&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;type_name&lt;/span&gt;&lt;/code&gt;, a utility function that
returns the name of a type as a string.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;span&lt;/span&gt;&lt;/code&gt;, a C++11 implementation of
C++20's &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;span&lt;/span&gt;&lt;/code&gt; (Glen Fernandes).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/describe/"&gt;Describe&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;has_describe_enumerators&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;has_describe_bases&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;has_describe_members&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;enum_to_string&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;enum_from_string&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added relational and stream insertion operators.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;descriptor_by_name&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;descriptor_by_pointer&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/dll/"&gt;DLL&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed missing #include, thanks to Denis Blank (&lt;a href="https://github.com/boostorg/dll/pull/54"&gt;PR#54&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Dropped TravisCI in favor of GithubAction CI
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v4:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;filename&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt; no longer return an implicit
trailing dot (".") element if the path ends with a directory
separator. Instead, an empty path is returned, similar to C++17 std::filesystem.
This also affects other methods that are defined in terms of iterators
or filename, such as &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stem&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;compare&lt;/span&gt;&lt;/code&gt; or &lt;code&gt;&lt;span class="identifier"&gt;lexicographical_compare&lt;/span&gt;&lt;/code&gt;.
For example, &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"a/b/"&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt; &lt;span class="special"&gt;==&lt;/span&gt; &lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"a/b/."&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt;
no longer holds true. (&lt;a href="https://github.com/boostorg/filesystem/issues/193"&gt;#193&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v4:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;lexically_normal&lt;/span&gt;&lt;/code&gt;
no longer produce a trailing dot (".") element and omits
a directory separator after a trailing dot-dot ("..") element
in the normalized paths.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v4:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;/code&gt;
append operations now consider root name and root directory in the
appended path. If the appended path is absolute, or root name is
present and differs from the source path, the resulting path is equivalent
to the appended path. If root directory is present, the result is
the root directory and relative path rebased on top of the root name
of the source path. Otherwise, the behavior is similar to v3. (&lt;a href="https://github.com/boostorg/filesystem/issues/214"&gt;#214&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;lexically_normal&lt;/span&gt;&lt;/code&gt; now converts directory
separators to preferred separators in the root name of the normalized
paths.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Optimized overloads of &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;assign&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;append&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;concat&lt;/span&gt;&lt;/code&gt;
and the corresponding operators to avoid unnecessary path copying
and reduce the amount of code redundancy.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On POSIX systems, fixed &lt;code&gt;&lt;span class="identifier"&gt;absolute&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;p&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt; &lt;span class="identifier"&gt;base&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; returning a path with root name
&lt;code&gt;&lt;span class="identifier"&gt;base&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;root_name&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
if &lt;code&gt;&lt;span class="identifier"&gt;p&lt;/span&gt;&lt;/code&gt; starts with
a root directory. In such a case &lt;code&gt;&lt;span class="identifier"&gt;p&lt;/span&gt;&lt;/code&gt;
is already an absolute path and should be returned as is.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;create_directories&lt;/span&gt;&lt;/code&gt;
no longer reports an error if the input path consists entirely of
dot (".") and dot-dot ("..") elements. The implementation
is no longer using recursion internally and therefore is better protected
from stack overflow on extremely long paths.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;remove&lt;/span&gt;&lt;/code&gt;
now supports deleting read-only files. The operation will attempt
to reset the read-only attribute prior to removal. Note that this
introduces a possibility of the read-only attribute being left unset,
if the operation fails and the original value of the attribute fails
to be restored. This also affects &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt;.
(&lt;a href="https://github.com/boostorg/filesystem/issues/216"&gt;#216&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt; now returns
&lt;code&gt;&lt;span class="keyword"&gt;static_cast&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;
&lt;span class="identifier"&gt;uintmax_t&lt;/span&gt; &lt;span class="special"&gt;&amp;gt;(-&lt;/span&gt;&lt;span class="number"&gt;1&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt;
in case of error, similar to C++17 std::filesystem.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a linking error about unresolved references to Boost.ContainerHash
functions when user's code includes &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;filesystem&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
but not &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;container_hash&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;hash&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt; and the compiler is set to
preserve unused inline functions. (&lt;a href="https://github.com/boostorg/filesystem/issues/215"&gt;#215&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for MSVC and compatible compilers eliminating
path globals cleanup in release builds. This could lead to a memory
leak if Boost.Filesystem shared library was repeatedly loaded and
unloaded in the process. (&lt;a href="https://github.com/boostorg/filesystem/issues/217"&gt;#217&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/geometry/"&gt;Geometry&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Improvements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/894"&gt;PR#894&lt;/a&gt; Optimization and refactoring of rtree queries.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/913"&gt;PR#913&lt;/a&gt; DynamicGeometry and GeometryCollection support
in various algorithms (undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/922"&gt;PR#922&lt;/a&gt; DynamicGeometry and GeometryCollection support
in distance (undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Solved issues
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/867"&gt;#867&lt;/a&gt; Poor performance of rtree query iterator with
nearest predicate for big k.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/870"&gt;#870&lt;/a&gt; Compilation error in boost::geometry::self_turns.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/896"&gt;#896&lt;/a&gt; Assertion failure in get_turns with BOOST_GEOMETRY_NO_ROBUSTNESS.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bugfixes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/906"&gt;PR#906&lt;/a&gt; Invalid result of buffer on macos-11 with
clang-12.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/921"&gt;PR#921&lt;/a&gt; Compilation errors with c++20 (various compilers)
and gcc-5.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Various fixes in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/json/"&gt;JSON&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Standalone mode of the library is deprecated.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Allow external libraries to forward declare &lt;code&gt;&lt;span class="identifier"&gt;value_to&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;value_from&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed signed integer overflow in number parsing.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for &lt;code&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;Zc&lt;/span&gt;&lt;span class="special"&gt;:&lt;/span&gt;&lt;span class="identifier"&gt;implicitNoexcept&lt;/span&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;/code&gt; on MSVC.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/lambda2/"&gt;Lambda2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added special cases in &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;lt;&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; when the first argument is
a stream, to allow &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;cout&lt;/span&gt;
&lt;span class="special"&gt;&amp;lt;&amp;lt;&lt;/span&gt; &lt;span class="identifier"&gt;_1&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;-&amp;gt;*&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;first&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;second&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/log/"&gt;Log&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
General changes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Updated detection of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;codecvt&lt;/span&gt;&lt;/code&gt;
specializations for &lt;code&gt;&lt;span class="keyword"&gt;char16_t&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="keyword"&gt;char32_t&lt;/span&gt;&lt;/code&gt; for
compatibility with C++17 and later. (&lt;a href="https://github.com/boostorg/log/pull/159"&gt;PR#159&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for C++17 &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;byte&lt;/span&gt;&lt;/code&gt;
type to receive methods of the inter-process message queue.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, when building the library for Windows 8 or later,
the library will use &lt;code&gt;&lt;span class="identifier"&gt;nt62&lt;/span&gt;&lt;/code&gt;
tag in the version namespace to denote the target OS ABI. For
example, the version namespace could be named as &lt;code&gt;&lt;span class="identifier"&gt;v2_mt_nt62&lt;/span&gt;&lt;/code&gt;. This name will
be part of all symbols exported by the library. Use the &lt;code&gt;&lt;span class="identifier"&gt;BOOST_USE_WINAPI_VERSION&lt;/span&gt;&lt;/code&gt;
macro consistenly when building Boost and your code to request
the minimum target Windows version.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improved performance of SSSE3 and AVX2 implementations of the
&lt;code&gt;&lt;span class="identifier"&gt;dump&lt;/span&gt;&lt;/code&gt; stream
manipulator.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for CMake build system. Only library build is
supported at this moment, Boost.Build is still used for running
tests.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a race condition on POSIX systems in &lt;code&gt;&lt;span class="identifier"&gt;reliable_message_queue&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;open_or_create&lt;/span&gt;&lt;/code&gt;
or the equivalent constructor. Multiple threads or processes
calling &lt;code&gt;&lt;span class="identifier"&gt;open_or_create&lt;/span&gt;&lt;/code&gt;
concurrently with sending or receiving messages from the same
queue could end up corrupting the queue contents and potentially
crashing the process. (&lt;a href="https://github.com/boostorg/log/issues/162"&gt;#162&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for &lt;code&gt;&lt;span class="identifier"&gt;b2&lt;/span&gt;
&lt;span class="identifier"&gt;install&lt;/span&gt;&lt;/code&gt; failing on
Windows because of missing &lt;code&gt;&lt;span class="identifier"&gt;boost_log_setup&lt;/span&gt;&lt;/code&gt;
library if &lt;code&gt;&lt;span class="identifier"&gt;BOOST_LOG_WITHOUT_SETTINGS_PARSERS&lt;/span&gt;&lt;/code&gt;
is defined. (&lt;a href="https://github.com/boostorg/log/issues/164"&gt;#164&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/libs/log/doc/html/log/changelog.html"&gt;changelog&lt;/a&gt;
for more details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/math/"&gt;Math&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Add support for cubic roots.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt;
versions of various standard library math routines.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for Bezier polynomials.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve worst-case tanh-sinh integration performance.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Disable inadvertant use of integral types in integration routines.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Minor update for erf approximations when the result is with 2ulp
of 1.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Allow Bernoulli code to be used on platforms with no atomic integers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve the mode of the non-central Chi Squared distribution.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve certain edge cases for &amp;lt;cstdfloat&amp;gt; complex-valued elementary
functions, see &lt;a href="https://github.com/boostorg/math/issues/507"&gt;#507&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/multi_index/"&gt;Multi-index Containers&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;contains&lt;/span&gt;&lt;/code&gt; to
key-based indices (issue &lt;a href="https://github.com/boostorg/multi_index/issues/35"&gt;#35&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;merge&lt;/span&gt;&lt;/code&gt; operations
to key-based indices. The functionality goes beyond the standard
specification for (unordered) associative containers in a number
of ways, most notably:
&lt;/div&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The source index can be of any type, including non key-based
indices.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Partial merge is provided: for instance, &lt;code&gt;&lt;span class="identifier"&gt;x&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;merge&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;y&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt;&lt;span class="identifier"&gt;first&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt;&lt;span class="identifier"&gt;last&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; merges only the elements of
&lt;code&gt;&lt;span class="identifier"&gt;y&lt;/span&gt;&lt;/code&gt; within [&lt;code&gt;&lt;span class="identifier"&gt;first&lt;/span&gt;&lt;/code&gt;,&lt;code&gt;&lt;span class="identifier"&gt;last&lt;/span&gt;&lt;/code&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Previous versions of &lt;code&gt;&lt;span class="identifier"&gt;splice&lt;/span&gt;&lt;/code&gt;
for sequenced and random access indices were destructive, i.e. elements
were copy-inserted into the destination and then erased from the
source. Now, &lt;code&gt;&lt;span class="identifier"&gt;splice&lt;/span&gt;&lt;/code&gt;
is based on node transfer much as &lt;code&gt;&lt;span class="identifier"&gt;merge&lt;/span&gt;&lt;/code&gt;
in key-based indices, and has been similarly extended to accept source
indices of any type: in fact, &lt;code&gt;&lt;span class="identifier"&gt;splice&lt;/span&gt;&lt;/code&gt;
can be regarded as a frontend to the same functionality provided
by &lt;code&gt;&lt;span class="identifier"&gt;merge&lt;/span&gt;&lt;/code&gt; in key-based
indices. For reasons of backwards compatibility, the destructive
behavior of &lt;code&gt;&lt;span class="identifier"&gt;splice&lt;/span&gt;&lt;/code&gt;
has been retained in the case that the source and destination containers
have unequal allocators.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The fact has been documented that index iterator types do only depend
on &lt;code&gt;&lt;span class="identifier"&gt;node_type&lt;/span&gt;&lt;/code&gt; and
the position of the index in its &lt;code&gt;&lt;span class="identifier"&gt;multi_index_container&lt;/span&gt;&lt;/code&gt;,
(except for hashed indices, where uniqueness/non-uniqueness is also
a dependency). This has implications on the validity of iterators
to elements transferred by &lt;code&gt;&lt;span class="identifier"&gt;merge&lt;/span&gt;&lt;/code&gt;
or &lt;code&gt;&lt;span class="identifier"&gt;splice&lt;/span&gt;&lt;/code&gt;. This property
is a variant of what has been called &lt;a href="https://wg21.link/n2980"&gt;SCARY
iterators&lt;/a&gt; in the C++ standard mailing lists. SCARYness is
currently (August 2021) not mandated for standard containers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Iterator SCARYness is now also preserved in &lt;a href="https://www.boost.org/libs/multi_index/doc/tutorial/debug.html#safe_mode"&gt;safe
mode&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/multiprecision/"&gt;Multiprecision&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Rework rational_adaptor to remove dependency on Boost.Rational and
improve performance.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix issue with type_traits and clang, see &lt;a href="https://github.com/boostorg/multiprecision/issues/383"&gt;#383&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed buggy Lehmer's GCD routine, see &lt;a href="https://github.com/boostorg/multiprecision/issues/370"&gt;#370&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix mpc_complex constructors so that lossy conversions are explicit,
see &lt;a href="https://github.com/boostorg/multiprecision/issues/363"&gt;#363&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct miscellaneous configuration issues (Intel intrinsic usage
and Apple clang).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct some iostream operators for unsigned char types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct mpq_rational conversions to integer types, see &lt;a href="https://github.com/boostorg/multiprecision/issues/342"&gt;#342&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/nowide/"&gt;Nowide&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Breaking Change: &lt;code&gt;&lt;span class="identifier"&gt;do_unshift&lt;/span&gt;&lt;/code&gt;
for the UTF-32 specialization of &lt;code&gt;&lt;span class="identifier"&gt;utf8_codecvt&lt;/span&gt;&lt;/code&gt;
now correctly returns &lt;code&gt;&lt;span class="identifier"&gt;noconv&lt;/span&gt;&lt;/code&gt;
instead of &lt;code&gt;&lt;span class="identifier"&gt;ok&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Remove unnecessary branch in &lt;code&gt;&lt;span class="identifier"&gt;utf8_codecvt&lt;/span&gt;&lt;/code&gt;
for UTF-16 output
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Suppress deprecation warnings in MSVC when using &lt;code&gt;&lt;span class="identifier"&gt;utf8_codecvt&lt;/span&gt;&lt;/code&gt;
with unicode char types
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix possible double-free when setting a custom buffer (&lt;code&gt;&lt;span class="identifier"&gt;setbuf&lt;/span&gt;&lt;/code&gt;) after &lt;code&gt;&lt;span class="identifier"&gt;filebuf&lt;/span&gt;&lt;/code&gt;
already allocated an internal buffer
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/pfr/"&gt;PFR&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added missing &lt;code&gt;&lt;span class="preprocessor"&gt;#include&lt;/span&gt;
&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;memory&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; for inclusion of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;addressof&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed -Wzero-length-array warning when dealing with empty aggregates
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation on msvc compilers &amp;lt;= 1920 (thanks to Alexey
Romanov aka @alexey-romanov)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added basic CMakeLists.txt support (thanks to @pdimov aka Peter Dimov)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Multiple improvements for docs, including links to https://github.com/apolukhin/pfr_non_boost
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added misc/strip_boost_namespace.sh script to remove &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;BOOST_&lt;/span&gt;&lt;/code&gt; prefixes
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/predef/"&gt;Predef&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Version 1.13.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix spelling of "epoch".
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add missing parenthesis in sparc.h (from tkoecker).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update documentation to use Rouge code styling and Amber general
style.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/regex/"&gt;Regex&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Breaking Change:&lt;/strong&gt; Change \B to be
the opposite of \b as per Perl behaviour.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Change w32_regex_traits.hpp so that windows.h is no longer included.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fxed fuzzing related issues &lt;a href="https://github.com/boostorg/regex/issues/151"&gt;#151&lt;/a&gt;,
&lt;a href="https://github.com/boostorg/regex/issues/152"&gt;#152&lt;/a&gt;,
&lt;a href="https://github.com/boostorg/regex/issues/153"&gt;#153&lt;/a&gt;,
&lt;a href="https://github.com/boostorg/regex/issues/156"&gt;#156&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added support for source locations to &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;to_string&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;to_string&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;what&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;system_error&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;what&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
now contains the source location, if present.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;result&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt; &lt;span class="identifier"&gt;E&lt;/span&gt; &lt;span class="special"&gt;=&lt;/span&gt; &lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;,
a class holding either a value or an error, defined in &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;system&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;result&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/utility/"&gt;Utility&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Library documentation converted to QuickBook (thanks to Alan de Freitas,
&lt;a href="https://github.com/boostorg/utility/pull/79"&gt;PR#79&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/variant2/"&gt;Variant2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;variant2&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;unsafe_get&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;I&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;visit_by_index&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;lt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_78_0.updated_tools"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Tools&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/tools/build/"&gt;Build&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Includes release of &lt;a href="https://www.boost.org/tools/build/doc/html/#_version_4_7_2"&gt;B2
version 4.7.2&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_78_0.compilers_tested"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Compilers Tested&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost's primary test compilers are:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.4, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++20: 11.0.0, 12.0.0, 13.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.6.3, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++20: 8.0.1, 9.1.0, 10, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++20: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_78_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow, Michael Caisse and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item><item><title>Version 1.77.0</title><link>https://www.boost.org/users/history/version_1_77_0.html</link><guid>https://www.boost.org/users/history/version_1_77_0.html</guid><pubDate>Wed, 11 Aug 2021 14:25:13 +0000</pubDate><description>
&lt;div id="version_1_77_0.new_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;New Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/describe/"&gt;Describe&lt;/a&gt;:&lt;/span&gt; A C++14 reflection
library, from Peter Dimov. Provides macros for describing enumerators and
struct/class members, and primitives for querying this information.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/lambda2/"&gt;Lambda2&lt;/a&gt;:&lt;/span&gt; A C++14, dependency-free,
single header lambda library, from Peter Dimov. Allows simple function
objects to be constructed via expressions such as &lt;code&gt;&lt;span class="identifier"&gt;_1&lt;/span&gt;
&lt;span class="special"&gt;+&lt;/span&gt; &lt;span class="number"&gt;5&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;_1&lt;/span&gt; &lt;span class="special"&gt;%&lt;/span&gt;
&lt;span class="number"&gt;2&lt;/span&gt; &lt;span class="special"&gt;==&lt;/span&gt; &lt;span class="number"&gt;0&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;_1&lt;/span&gt;
&lt;span class="special"&gt;&amp;gt;&lt;/span&gt; &lt;span class="identifier"&gt;_2&lt;/span&gt;&lt;/code&gt;,
or &lt;code&gt;&lt;span class="identifier"&gt;_1&lt;/span&gt; &lt;span class="special"&gt;==&lt;/span&gt;
&lt;span class="char"&gt;' '&lt;/span&gt; &lt;span class="special"&gt;||&lt;/span&gt; &lt;span class="identifier"&gt;_1&lt;/span&gt; &lt;span class="special"&gt;==&lt;/span&gt; &lt;span class="char"&gt;'\t'&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_77_0.updated_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/any/"&gt;Any&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;anys&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_any&lt;/span&gt;&lt;/code&gt; - a data type with customizable
Small Object Optimization whose instances can hold instances of any
type that satisfies ValueType requirements (many thanks to Ruslan
Arutyunyan @rarutyun). If you are not sure that you really need it,
then use &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;any&lt;/span&gt;&lt;/code&gt; instead.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Started using GithubActions CI for additional testing
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/asio/"&gt;Asio&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added support for cancellation of individual asynchronous operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;associator&lt;/span&gt;&lt;/code&gt;
trait, used to generically forward associators.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed all asynchronous operations implemented in Asio to invoke
their completion handlers as rvalue references.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for asynchronous operations with multiple completion
signatures.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;&amp;amp;&amp;amp;&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;||&lt;/span&gt;&lt;/code&gt;
for &lt;code&gt;&lt;span class="identifier"&gt;awaitable&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;,
to allow coroutines to be trivially awaited in parallel.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;as_tuple&lt;/span&gt;&lt;/code&gt;
completion token adapter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;append&lt;/span&gt;&lt;/code&gt;
completion token adapter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;prepend&lt;/span&gt;&lt;/code&gt;
completion token adapter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;deferred&lt;/span&gt;&lt;/code&gt;
completion token, whicih allows deferred execution of asynchronous
operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;parallel_group&lt;/span&gt;&lt;/code&gt;
class and &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;make_parallel_group&lt;/span&gt;&lt;/code&gt;
function.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;promise&lt;/span&gt;&lt;/code&gt;,
which allows eager execution and synchronisation of asynchronous
operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;coro&lt;/span&gt;&lt;/code&gt;
class template, a C++20 coroutine primitive with the ability to combine
both asynchronous waiting (&lt;code&gt;&lt;span class="identifier"&gt;co_await&lt;/span&gt;&lt;/code&gt;)
and yielding (&lt;code&gt;&lt;span class="identifier"&gt;co_yield&lt;/span&gt;&lt;/code&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added move assignment to &lt;code&gt;&lt;span class="identifier"&gt;ssl&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stream&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed &lt;code&gt;&lt;span class="identifier"&gt;co_spawn&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;dispatch&lt;/span&gt;&lt;/code&gt; the coroutine's
initial step to the executor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enabled additional optimisations for &lt;code&gt;&lt;span class="identifier"&gt;any_executor&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;any_io_executor&lt;/span&gt;&lt;/code&gt;
when used with asynchronous operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;nodiscard&lt;/span&gt;&lt;/code&gt;
attribute to &lt;code&gt;&lt;span class="identifier"&gt;awaitable&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Increased the number of cached slots in the default recycling allocator.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed the default allocator behaviour to respect alignment requirements,
to support over-aligned types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured the result strings are always initialised in reverse name
resolution.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed recursive template instantiation issues in &lt;code&gt;&lt;span class="identifier"&gt;use_awaitable_t&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;executor_with_default&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed the &lt;code&gt;&lt;span class="identifier"&gt;any_io_executor&lt;/span&gt;&lt;/code&gt;
equality operators to correctly return a result based on the target
executor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;strand&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;
to avoid using a potentially moved-from executor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured &lt;tt&gt;gcc&lt;/tt&gt; tests are not used for &lt;tt&gt;clang&lt;/tt&gt;
when detecting compiler features.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Disabled coroutines support for the &lt;tt&gt;clang&lt;/tt&gt; shipped
with MSVC.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compatibility with recent LibreSSL when &lt;code&gt;&lt;span class="identifier"&gt;OPENSSL_NO_SSL_INTERN&lt;/span&gt;&lt;/code&gt;
is defined.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;posix&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_stream_descriptor&lt;/span&gt;&lt;/code&gt; move operations
to work with non-defaulted executors.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Consult the &lt;a href="https://www.boost.org/doc/libs/1_77_0/doc/html/boost_asio/history.html"&gt;Revision
History&lt;/a&gt; for further details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/atomic/"&gt;Atomic&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;make_atomic_ref&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;make_ipc_atomic_ref&lt;/span&gt;&lt;/code&gt;
factory functions for constructing atomic reference objects.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added C++17 template argument deduction guides for &lt;code&gt;&lt;span class="identifier"&gt;atomic_ref&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;ipc_atomic_ref&lt;/span&gt;&lt;/code&gt;
to allow omitting template arguments when they can be deduced from
constructor arguments.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This maintenance update brings minor bug fixes and updated CI reporting.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
We'd love to know how you or your company use Beast, consider adding
an entry to the &lt;a href="https://github.com/boostorg/beast/wiki/Companies-and-Individuals-Using-Beast"&gt;Companies
and Individuals Using Beast&lt;/a&gt; list.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/beast/doc/html/beast/release_notes.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/conversion/"&gt;Conversion&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;implicit_cast&lt;/span&gt;&lt;/code&gt; is now &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt; (&lt;a href="https://github.com/boostorg/conversion/issues/25"&gt;#25&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed broken links (&lt;a href="https://github.com/boostorg/conversion/pull/23"&gt;PR#23&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Started using GithubActions CI for additional testing
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/core/"&gt;Core&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;uncaught_exceptions&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt; has been modified for compatibility
with Mac OS 10.4 and older. (&lt;a href="https://github.com/boostorg/core/pull/92"&gt;PR#92&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/dll/"&gt;DLL&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
More runtime checks for malformed ELFs in &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;dll&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;library_info&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;dll&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;library_info&lt;/span&gt;&lt;/code&gt; use info from &lt;code&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;dynsym&lt;/span&gt;&lt;/code&gt;
ELF section if &lt;code&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;symtab&lt;/span&gt;&lt;/code&gt;
is empty or missing
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
List protected ELF symbols in &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;dll&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;library_info&lt;/span&gt;&lt;/code&gt;
as they are available for import (&lt;a href="https://github.com/boostorg/dll/issues/50"&gt;#50&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Remove unneeded convert from &lt;code&gt;&lt;span class="keyword"&gt;wchar_t&lt;/span&gt;&lt;/code&gt;
to char on POSIX environment, thanks to Vladislav Shchapov (&lt;a href="https://github.com/boostorg/dll/pull/49"&gt;PR#49&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Started using GithubAction CI for additional testing
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Introducing Boost.Filesystem v4.&lt;/strong&gt;
This new version of the library removes all deprecated features of
v3 and also makes a number of breaking API changes intended to make
Boost.Filesystem more compatible with std::filesystem introduced
in C++17. The differences are described in the release notes and
documentation using &lt;strong&gt;v3&lt;/strong&gt; and &lt;strong&gt;v4&lt;/strong&gt; tags and are also summarised in a separate
section. Users can select Boost.Filesystem version by defining &lt;code&gt;&lt;span class="identifier"&gt;BOOST_FILESYSTEM_VERSION&lt;/span&gt;&lt;/code&gt; macro
to either 3 or 4 when compiling their code. There is no need to separately
compile Boost.Filesystem for each library version - a single binary
supports both v3 and v4. Users should avoid using both v3 and v4
in the same application as this can lead to subtle bugs. Currently,
v3 is the default. In a future release v4 will become the default,
and eventually v3 will be removed. v4 is functional, but it is still
a work in progress and there may be breaking API changes in the future.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v4:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;filename&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stem&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;extension&lt;/span&gt;&lt;/code&gt;
no longer consider root name or root directory of the path as a filename
if the path only consists of those components. For example, on Windows
&lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"C:"&lt;/span&gt;&lt;span class="special"&gt;).&lt;/span&gt;&lt;span class="identifier"&gt;filename&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
used to return "C:" and &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"C:\\"&lt;/span&gt;&lt;span class="special"&gt;).&lt;/span&gt;&lt;span class="identifier"&gt;filename&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; used to return "\" and
both will return an empty path now. (&lt;a href="https://github.com/boostorg/filesystem/issues/88"&gt;#88&lt;/a&gt;, &lt;a href="https://github.com/boostorg/filesystem/issues/194"&gt;#194&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;v4:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;stem&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;extension&lt;/span&gt;&lt;/code&gt; no longer treat a filename
that starts with a dot and has no other dots as an extension. Filenames
starting with a dot are commonly treated as filenames with an empty
extension. The leading dot is used to indicate a hidden file on most
UNIX-like systems. (&lt;a href="https://github.com/boostorg/filesystem/issues/88"&gt;#88&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Improved support for various
path prefixes on Windows. Added support for local device prefix ("\\.\")
and experimental support for NT path prefix ("\??\"). The
prefixes will be included in the root name of a path. Note that using
the prefixes with Boost.Filesystem v3 can lead to surprising results
(e.g. &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"\\\\.\\"&lt;/span&gt;&lt;span class="special"&gt;).&lt;/span&gt;&lt;span class="identifier"&gt;stem&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;
&lt;span class="special"&gt;==&lt;/span&gt; &lt;span class="string"&gt;"\\\\"&lt;/span&gt;&lt;/code&gt;).
It is recommended to use the prefixes only with Boost.Filesystem
v4.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reworked &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;lexically_normal&lt;/span&gt;&lt;/code&gt; implementation
to eliminate some cases of duplicate dot (".") elements
in the normalized paths.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Added runtime detection of
the &lt;code&gt;&lt;span class="identifier"&gt;statx&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;getrandom&lt;/span&gt;&lt;/code&gt; system calls on Linux.
This can be useful if the syscall is present at compile time but
fails with &lt;code&gt;&lt;span class="identifier"&gt;ENOSYS&lt;/span&gt;&lt;/code&gt;
at run time (for example, in Docker containers that restrict the
syscall, even if available on the host). (&lt;a href="https://github.com/boostorg/filesystem/issues/172"&gt;#172&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Added support for disabling
usage of various system APIs at library build time. This can be useful
when a certain API is detected as present by the library configuration
scripts but must not be used for some reason (for example, when runtime
detection does not work on the target system). See the description
of configuration macros in the library documentationfor for more
details.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Added &lt;code&gt;&lt;span class="identifier"&gt;copy_options&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;synchronize_data&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;copy_options&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;synchronize&lt;/span&gt;&lt;/code&gt;
options for the &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt;
operation. These options allow to synchronize the written data and
attributes with the permanent storage. These options are expensive
in terms of performance, but allow to ensure reliability of the copied
data. Note that &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt;
performed implicit data synchronization on POSIX systems since Boost.Filesystem
1.74.0. This release adds support for more platforms and disables
data synchronization by default while allowing the caller to explicitly
request it. (&lt;a href="https://github.com/boostorg/filesystem/issues/186"&gt;#186&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added handling of &lt;code&gt;&lt;span class="identifier"&gt;EINTR&lt;/span&gt;&lt;/code&gt;
error code on POSIX systems for some system calls issued internally.
In particular, &lt;code&gt;&lt;span class="identifier"&gt;EINTR&lt;/span&gt;&lt;/code&gt;
could have been ignored on &lt;code&gt;&lt;span class="identifier"&gt;close&lt;/span&gt;&lt;/code&gt;,
which on HP-UX would result in a leaked file descriptor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In the &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt;
implementations based on Linux &lt;code&gt;&lt;span class="identifier"&gt;sendfile&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;copy_file_range&lt;/span&gt;&lt;/code&gt;
system calls, added handling of error codes indicating that a particular
filesystem does not support the system call and fall back to the
generic &lt;code&gt;&lt;span class="identifier"&gt;read&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;write&lt;/span&gt;&lt;/code&gt; loop. This should fix &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt; failing on &lt;a href="https://www.ecryptfs.org/"&gt;eCryptFS&lt;/a&gt;
and possibly other filesystems. (&lt;a href="https://github.com/boostorg/filesystem/issues/184"&gt;#184&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The &lt;code&gt;&lt;span class="identifier"&gt;copy_file_range&lt;/span&gt;&lt;/code&gt;
system call is now used since Linux kernel 4.5, whereas previously
it was only enabled since 5.3. The &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt;
implementation will fall back to &lt;code&gt;&lt;span class="identifier"&gt;sendfile&lt;/span&gt;&lt;/code&gt;
or &lt;code&gt;&lt;span class="identifier"&gt;read&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;write&lt;/span&gt;&lt;/code&gt; loop if &lt;code&gt;&lt;span class="identifier"&gt;copy_file_range&lt;/span&gt;&lt;/code&gt;
fails to copy a given file across filesystems.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt; implementations
based on Linux &lt;code&gt;&lt;span class="identifier"&gt;sendfile&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;copy_file_range&lt;/span&gt;&lt;/code&gt;
system calls will not be used on filesystems that are known to contain
files with generated content. These system calls are incompatible
with such files, and copying them would result in zero-sized files.
The generic &lt;code&gt;&lt;span class="identifier"&gt;read&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;write&lt;/span&gt;&lt;/code&gt; loop will be used instead.
Currently, the blacklisted filesystems are: procfs, sysfs, tracefs
and debugfs.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In the &lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt;
implementation based on &lt;code&gt;&lt;span class="identifier"&gt;read&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;write&lt;/span&gt;&lt;/code&gt; loop, increased the maximum
size of the buffer used for temporary storage and take into account
the target filesystem block size for more optimal performance.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows CE, calling &lt;code&gt;&lt;span class="identifier"&gt;current_path&lt;/span&gt;&lt;/code&gt;
to obtain the current path for a process will now fail with an error
instead of returning successfully with a root path. This platform
does not support current directory. Changing the current path was
already failing similarly in previous releases of Boost.Filesystem.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;canonical&lt;/span&gt;&lt;/code&gt;, fixed
the check for a symlink referencing a directory above root, if an
earlier symlink was resolved to an absolute path with a different
root from the original path.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;canonical&lt;/span&gt;&lt;/code&gt;, added
a limit for the maximum number of symlinks that can be resolved during
the call. The limit is currently at least 40 symlinks.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;canonical&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;weakly_canonical&lt;/span&gt;&lt;/code&gt;
will now use &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;preferred_separator&lt;/span&gt;&lt;/code&gt;
for the root directory separator in the resulting paths. This fixes
"file not found" errors caused by Windows API not handling
generic separators in UNC paths and paths that start with the Win32
filesystem prefix ("\\?\"). (&lt;a href="https://github.com/boostorg/filesystem/issues/87"&gt;#87&lt;/a&gt;, &lt;a href="https://github.com/boostorg/filesystem/issues/187"&gt;#187&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Added &lt;code&gt;&lt;span class="identifier"&gt;weakly_canonical&lt;/span&gt;&lt;/code&gt;
overloads taking &lt;code&gt;&lt;span class="identifier"&gt;base&lt;/span&gt;&lt;/code&gt;
path as an argument.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;weakly_canonical&lt;/span&gt;&lt;/code&gt;
no longer fails with an error if the input path contains elements
that do not exist in the filesystem but are cancelled by a subsequent
dot-dot ("..") element. For example, &lt;code&gt;&lt;span class="identifier"&gt;weakly_canonical&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="string"&gt;"C:\\a\\.."&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; would previously fail if "C:\a"
directory did not exist. (&lt;a href="https://github.com/boostorg/filesystem/issues/201"&gt;#201&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;read_symlink&lt;/span&gt;&lt;/code&gt; on
Windows, corrected reparse point handling. The operation would return
an empty path for some mount points (for example, created by &lt;a href="https://www.box.com/"&gt;Box&lt;/a&gt; cloud storage driver) and
directory junction points that had empty print names. The new implementation
now parses substitute name of the reparse point and attempts to reconstruct
a Win32 path from it. (&lt;a href="https://github.com/boostorg/filesystem/issues/187"&gt;#187&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, file streams provided in &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;filesystem&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;fstream&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
will use wide character paths on libc++ versions 7.0 and higher,
when the standard library supports opening files with wide character
paths. (&lt;a href="https://github.com/boostorg/filesystem/issues/181"&gt;#181&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, creating symlinks should no longer require elevated privileges,
if Windows is configured in &lt;a href="https://docs.microsoft.com/en-us/windows/apps/get-started/enable-your-device-for-development"&gt;Developer
mode&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
With some compilers, global objects used internally in Boost.Filesystem
are now destroyed after user's global destructors are called. This
allows to call Boost.Filesystem methods during the program termination
stage. In particular, this concerns the path locale that is used
for character code conversion and can be installed by calling &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;imbue&lt;/span&gt;&lt;/code&gt;. The supported compilers
include MSVC, GCC and Clang, as well as other compilers that support
customizing program initialization order through &lt;code&gt;&lt;span class="preprocessor"&gt;#pragma&lt;/span&gt;
&lt;span class="identifier"&gt;section&lt;/span&gt;&lt;/code&gt; (for MSVC-compatible
compilers) or &lt;code&gt;&lt;span class="identifier"&gt;__attribute__&lt;/span&gt;
&lt;span class="special"&gt;((&lt;/span&gt;&lt;span class="identifier"&gt;init_priority&lt;/span&gt;&lt;span class="special"&gt;))&lt;/span&gt;&lt;/code&gt; (for GCC-compatible compilers).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/geometry/"&gt;Geometry&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Improvements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/812"&gt;PR#812&lt;/a&gt; Umbrella strategies for distance and comparable_distance
(undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/840"&gt;PR#840&lt;/a&gt; Umbrella strategies for various algorithms
(undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/850"&gt;PR#850&lt;/a&gt; Introduced DynamicGeometry and GeometryCollection
concepts and support in some algorithms (undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/855"&gt;PR#855&lt;/a&gt; Various improvements related to strategies.
Default strategies are now included with algorithms.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Solved issues
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/865"&gt;#865&lt;/a&gt; Exception thrown in rtree serialization.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/439"&gt;#439&lt;/a&gt; Invalid box spherical area computation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/838"&gt;#838&lt;/a&gt; Invalid result of union_().
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/851"&gt;#851&lt;/a&gt; Invalid geographic disjoint segment/box result.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/861"&gt;#861&lt;/a&gt; Invalid result of intersection().
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bugfixes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/832"&gt;PR#832&lt;/a&gt; Fixed box spherical and geographic area computation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/853"&gt;PR#853&lt;/a&gt; Fixed geographic disjoint segment/box.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/866"&gt;PR#866&lt;/a&gt; Fixed serialization of rtree containing lesser
number of elements in root node than minimum.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/886"&gt;PR#886&lt;/a&gt; Fixed knn rtree query bug causing it to be
slow for big k.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Various fixes in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/json/"&gt;JSON&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;value_to&lt;/span&gt;&lt;/code&gt; supports
&lt;code&gt;&lt;span class="identifier"&gt;TupleLike&lt;/span&gt;&lt;/code&gt; types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;value_to&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;value_from&lt;/span&gt;&lt;/code&gt; support &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;array&lt;/span&gt;&lt;/code&gt; and similar types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Implicit conversion operator from &lt;code&gt;&lt;span class="identifier"&gt;string&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;hash&lt;/span&gt;&lt;/code&gt; specializations for json types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed allocation errors in &lt;code&gt;&lt;span class="identifier"&gt;object&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;key_value_pair&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed crash when constructing &lt;code&gt;&lt;span class="identifier"&gt;array&lt;/span&gt;&lt;/code&gt;
from a pair of iterators that form an empty range.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/lexical_cast/"&gt;LexicalCast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed assignment to an int of a floating point value that is out
of representable range for int.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Started using GithubActions CI for additional testing
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/log/"&gt;Log&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation for riscv32 target. (&lt;a href="https://github.com/boostorg/log/pull/150"&gt;PR#150&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/mp11/"&gt;Mp11&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;mp_intersperse&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;mp_split&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;mp_join&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/multi_index/"&gt;Multi-index Containers&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Maintenance work.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/nowide/"&gt;Nowide&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Allow for usage of &lt;code&gt;&lt;span class="identifier"&gt;iostream&lt;/span&gt;&lt;/code&gt;
classes before &lt;code&gt;&lt;span class="identifier"&gt;main&lt;/span&gt;&lt;/code&gt;
(best effort, works for most environments)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix initialization of &lt;code&gt;&lt;span class="identifier"&gt;rdbuf&lt;/span&gt;&lt;/code&gt;
in &lt;code&gt;&lt;span class="identifier"&gt;cin&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;cout&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;cerr&lt;/span&gt;&lt;/code&gt; for redirected input/output
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix corner case in &lt;code&gt;&lt;span class="identifier"&gt;cin&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;unget&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; after using &lt;code&gt;&lt;span class="identifier"&gt;putback&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix possibly delayed &lt;code&gt;&lt;span class="identifier"&gt;close&lt;/span&gt;&lt;/code&gt;
of &lt;code&gt;&lt;span class="identifier"&gt;filebuf&lt;/span&gt;&lt;/code&gt; after
move assignment
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve performance of &lt;code&gt;&lt;span class="identifier"&gt;utf8_codecvt&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/pfr/"&gt;PFR&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
A MurMur Hash based implementation of hash_combine() is now used
to reduce collisions count and improve quality of &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;pfr&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;hash_value&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Visual Studio 2017 now supported in C++14 mode (thanks to Denis Mikhailov
aka @denzor200)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Issues found by inspect tool were fixed
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed some warnings, including removal of extra semicolons in include/boost/pfr/detail/fields_count.hpp
(&lt;a href="https://github.com/boostorg/pfr/issues/72"&gt;#72&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a compile time assert for inherited types (thanks to Denis
Mikhailov aka @denzor200)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reflection of aggregates with non movable fields is now possible
if guaranteed copy elision is on
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed spelling issues
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Started using GithubActions CI for additional testing
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/property_tree/"&gt;PropertyTree&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This is a maintenance release.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Extend compiler coverage in CI.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix Boost compatibility for CMakeLists.txt.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The conversion operator from &lt;code&gt;&lt;span class="identifier"&gt;error_category&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_category&lt;/span&gt;&lt;/code&gt; has been improved
and no longer requires &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;map&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;
or &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;mutex&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The comparison operators of &lt;code&gt;&lt;span class="identifier"&gt;error_category&lt;/span&gt;&lt;/code&gt;
are now inline friends instead of member functions (a side effect
of the previous change.)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;/code&gt; now
defers calling &lt;code&gt;&lt;span class="identifier"&gt;generic_category&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; to avoid instantiating the object
until it's actually needed.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;failed&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;message&lt;/span&gt;&lt;/code&gt;
have been undeprecated, and &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;
&lt;span class="keyword"&gt;bool&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
now once again returns &lt;code&gt;&lt;span class="identifier"&gt;failed&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The system category now doesn't call &lt;code&gt;&lt;span class="identifier"&gt;generic_category&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, to avoid instantiating the object.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The return value of &lt;code&gt;&lt;span class="identifier"&gt;default_error_condition&lt;/span&gt;&lt;/code&gt;
changes in some cases into an &lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;/code&gt;
from the generic category, instead of from the system category. This
happens on POSIX when the input &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;
is from the system category and does not correspond to any &lt;code&gt;&lt;span class="identifier"&gt;errc_t&lt;/span&gt;&lt;/code&gt; value.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The interoperability of &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt; has been improved substantially.
It is now possible to construct &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;system&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;
from &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;, and it's possible to
pass &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;system&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt; to functions taking
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;&amp;amp;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
A stream insertion operator for &lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;/code&gt;
has been added.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/uuid/"&gt;Uuid&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;to_chars&lt;/span&gt;&lt;/code&gt; for
writing uuid strings without allocating (&lt;a href="https://github.com/boostorg/uuid/pull/116"&gt;PR#116&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_77_0.updated_tools"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Tools&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/tools/build/"&gt;Build&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Includes release of &lt;a href="https://www.boost.org/tools/build/doc/html/#_version_4_6_1"&gt;B2
version 4.6.1&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_77_0.compilers_tested"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Compilers Tested&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost's primary test compilers are:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.4, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 5.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0, 12.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++20: 11.0.0, 12.0.0, 13.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.6.3, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 6.4.0, 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1, 9.1.0, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++20: 8.0.1, 9.1.0, 10, 11
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++20: 11.0.3
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 10.0, 11.0, 12.0, 14.0, 14.1, 14.2
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_77_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow, Michael Caisse and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item><item><title>Version 1.76.0</title><link>https://www.boost.org/users/history/version_1_76_0.html</link><guid>https://www.boost.org/users/history/version_1_76_0.html</guid><pubDate>Fri, 16 Apr 2021 21:05:27 +0000</pubDate><description>
&lt;div id="version_1_76_0.new_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;New Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
No new libraries
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_76_0.updated_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/asio/"&gt;Asio&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;scope_id_type&lt;/span&gt;&lt;/code&gt; type alias.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;port_type&lt;/span&gt;&lt;/code&gt; type alias.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;hash&lt;/span&gt;&lt;/code&gt; specialisations for IP addresses.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;hash&lt;/span&gt;&lt;/code&gt; specialisations for &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_endpoint&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Refactored SFINAE usage to improve compile times.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added friendship support to customisation points, and made most customisations
private.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed &lt;code&gt;&lt;span class="identifier"&gt;any_io_executor&lt;/span&gt;&lt;/code&gt;
to a "strong typedef"-style class.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;as_single&lt;/span&gt;&lt;/code&gt;
to work with handler hook deprecation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured pthread condition variable attributes are cleaned up on all
platforms.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clarified thread safety notes on sockets and descriptors.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured &lt;code&gt;&lt;span class="identifier"&gt;errno&lt;/span&gt;&lt;/code&gt; is
not overwritten if &lt;code&gt;&lt;span class="identifier"&gt;socket&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; fails on macOS/FreeBSD.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed work tracking for &lt;code&gt;&lt;span class="identifier"&gt;io_context&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;thread_pool&lt;/span&gt;&lt;/code&gt; executors
when move-assigned.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured internal &lt;code&gt;&lt;span class="identifier"&gt;call_stack&lt;/span&gt;&lt;/code&gt;
objects are accessed only from implementation files.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed I/O object move-assignment to ensure the executor is left in
a valid state.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed detection of compiler support for defaulted template argument
on functions with MSVC.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Prevented the &lt;code&gt;&lt;span class="identifier"&gt;blocking&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;always&lt;/span&gt;&lt;/code&gt;
property from being used with &lt;code&gt;&lt;span class="identifier"&gt;strand&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;, as it did not produce the
correct semantics.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed deprecated file &lt;tt&gt;asio/impl/src.cpp&lt;/tt&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/atomic/"&gt;Atomic&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation with MSVC for ARM. (&lt;a href="https://github.com/boostorg/atomic/pull/49"&gt;PR#49&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This update brings minor bug fixes and revamped CI reporting.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
We'd love to know how you or your company use Beast, consider adding
an entry to the &lt;a href="https://github.com/boostorg/beast/wiki/Companies-and-Individuals-Using-Beast"&gt;Companies
and Individuals Using Beast&lt;/a&gt; list.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/beast/doc/html/beast/release_notes.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/bind/"&gt;Bind&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Add support for using the standard C++11 placeholders with &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;bind&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;apply&lt;/span&gt;&lt;/code&gt; to use variadic templates
and perfect forwarding.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/continer/"&gt;Container&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added [[no-discard]] attribute in all containers to catch bugs related
to unused return values.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Replaced default standard exception classes with Boost.Container
own classes, reducing considerably the included files overhead. Example:
in MSVC 19 &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;container&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;vector&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
preprocessed file size reduces from 1,5MB to 930KB. If you still
want to use standard exception classes, you can define &lt;code&gt;&lt;span class="identifier"&gt;BOOST_CONTAINER_USE_STD_EXCEPTIONS&lt;/span&gt;&lt;/code&gt;
before using any Boost.Container class.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs/issues:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/102"&gt;GitHub
#102: &lt;em&gt;"flat_map::insert ambiguous with initializer
list &amp;amp; pairs that need to convert"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/139"&gt;GitHub
#139: &lt;em&gt;"flat_map merge and iterators"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/141"&gt;GitHub
#141: &lt;em&gt;"small_vector does not propagate no throw
properties of move operation of contained type"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/164"&gt;GitHub
#164: &lt;em&gt;"Compile error when using &lt;code&gt;&lt;span class="identifier"&gt;pmr&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;map&lt;/span&gt;&lt;/code&gt; with a &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;pair&lt;/span&gt;&lt;/code&gt;; works when using a
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;tuple&lt;/span&gt;&lt;/code&gt;"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/171"&gt;GitHub
#171: &lt;em&gt;"deque::clear() uses undefined behaviour"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/core/"&gt;Core&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Add implicit conversion between compatible reference wrappers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;cmath&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;, a portable implementation
of the floating point classification functions from &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;cmath&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;core&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;bit&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;, a portable implementation
of the C++20 standard header &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;bit&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix &lt;code&gt;&lt;span class="identifier"&gt;BOOST_TEST_EQ&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;BOOST_TEST_NE&lt;/span&gt;&lt;/code&gt; for
character types under C++20.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Revise allocator access utilities (now support VS2013, and no workarounds
use &lt;code&gt;&lt;span class="identifier"&gt;allocator_traits&lt;/span&gt;&lt;/code&gt;.)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/dll/"&gt;DLL&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING CHANGE&lt;/strong&gt;: &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;dll&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;import&lt;/span&gt;&lt;/code&gt;
was renamed to &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;dll&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;import_symbol&lt;/span&gt;&lt;/code&gt;
to avoid collision with C++20 &lt;code&gt;&lt;span class="identifier"&gt;import&lt;/span&gt;&lt;/code&gt;
keyword.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated docs, including FAQ section.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Updated compatibility with WASI platform. (&lt;a href="https://github.com/boostorg/filesystem/pull/169"&gt;PR#169&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed an exception being thrown by &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;remove_filename&lt;/span&gt;&lt;/code&gt;
if the path is "////". (&lt;a href="https://github.com/boostorg/filesystem/issues/176"&gt;#176&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;create_directories&lt;/span&gt;&lt;/code&gt;
disregarding errors from file status query operations issued internally.
This could result in incorrect error codes returned by &lt;code&gt;&lt;span class="identifier"&gt;create_directories&lt;/span&gt;&lt;/code&gt;. (&lt;a href="https://github.com/boostorg/filesystem/issues/182"&gt;#182&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/geometry/"&gt;Geometry&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Improvements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/670"&gt;PR#670&lt;/a&gt; New IOs to_wkt() and from_wkt() (thanks to
Baidyanath Kundu).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/756"&gt;PR#756&lt;/a&gt; Non cartesian and robust convex hulls.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/768"&gt;PR#768&lt;/a&gt; Umbrella strategies for relops, setops, index,
buffer and more (undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/797"&gt;PR#797&lt;/a&gt; New azimuth() algorithm.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/801"&gt;PR#801&lt;/a&gt; Improved accuracy in geographic area computations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/820"&gt;PR#820&lt;/a&gt; Parameter scale added to svg_mapper.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bugfixes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/808"&gt;PR#808&lt;/a&gt; Fixed compilation error with rtree serialization
enabled (thanks to Tristan Carel).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/815"&gt;PR#815&lt;/a&gt; Fixed issue in buffer().
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Various fixes in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Breaking changes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Removed strategy convex_hull::graham_andrew.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/gil/"&gt;GIL&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
BREAKING: In next release, we are going to drop support for GCC 5.
We will also change the required minimum C++ version from C++11 to
C++14.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/histogram/"&gt;Histogram&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This release contains critical fixes, please check that your results
are not affected.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/libs/histogram/doc/html/histogram/history.html"&gt;Release
Notes&lt;/a&gt; for details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/intrusive/"&gt;Intrusive&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Reduced compile-time dependencies:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;linear_slist_algorithms&lt;/span&gt;&lt;/code&gt;
use a simple node_ptr instead of std::pair on return.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;list&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;slist&lt;/span&gt;&lt;/code&gt; use &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;
&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;
&lt;span class="special"&gt;==&lt;/span&gt;&lt;/code&gt; instead of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;equal_to&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;less&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;a href="https://github.com/boostorg/intrusive/issues/54"&gt;GitHub
#54: &lt;em&gt;set.rbegin() looks like O(log(N))&lt;/em&gt;&lt;/a&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/interprocess/"&gt;Interprocess&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="keyword"&gt;wchar_t&lt;/span&gt;&lt;/code&gt; API support
for named resources in operating systems that offer native wide character
API (e.g. Windows). The following classes were updated with &lt;code&gt;&lt;span class="keyword"&gt;wchar_t&lt;/span&gt;&lt;/code&gt; name support:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;file_mapping&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;managed_mapped_file&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;managed_shared_memory&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;managed_windows_shared_memory&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;shared_memory_object&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;windows_shared_memory_object&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;file_lock&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_condition&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_condition_any&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_mutex&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_recursive_mutex&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_semaphore&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_sharable_mutex&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;named_upgradable_mutex&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;message_queue&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;BOOST_INTERPROCESS_FORCE_NATIVE_EMULATION&lt;/span&gt;&lt;/code&gt;
macro option to disable the use of generic emulation code for process
shared synchronization primitives instead of native POSIX or Winapi
functions.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/issues/76"&gt;GitHub
#76 (&lt;em&gt;"Cygwin compilation errors"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/pull/83"&gt;GitHub
#83 (&lt;em&gt;"Add BOOST_INTERPROCESS_FORCE_NATIVE_EMULATION
option"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/pull/92"&gt;GitHub
#92 (&lt;em&gt;"bufferstream: Correct MSVC compilation
warning"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/pull/106"&gt;GitHub
#106 (&lt;em&gt;"Use fallocate on truncate_file"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/issues/120"&gt;GitHub
#120 (&lt;em&gt;"segment_manager customization"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/issues/122"&gt;GitHub
#122 (&lt;em&gt;"Mark constructors/assignment/swap noexcept
where possible"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/issues/126"&gt;GitHub
#126 (&lt;em&gt;"_ReadWriteBarrier is deprecated warning
when compiling with clang-cl.exe"&lt;/em&gt;)&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/json/"&gt;JSON&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://cppalliance.org/pdf/C%20Plus%20Plus%20Alliance%20-%20Boost%20JSON%20Security%20Assessment%202020%20-%20Assessment%20Report%20-%2020210317.pdf"&gt;Security
Report&lt;/a&gt; from Bishop Fox.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
(&lt;a href="https://github.com/boostorg/json/issues/481"&gt;#481&lt;/a&gt;) Refactored &lt;code&gt;&lt;span class="identifier"&gt;value_from&lt;/span&gt;&lt;/code&gt;
implementation; user customizations are now always preferred over
library-provided overloads.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
(&lt;a href="https://github.com/boostorg/json/issues/484"&gt;#484&lt;/a&gt;) Fix imprecise parsing for some floating point numbers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
(&lt;a href="https://github.com/boostorg/json/issues/485"&gt;#485&lt;/a&gt;) Fix link errors in standalone mode, when used alongside
Boost.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
(&lt;a href="https://github.com/boostorg/json/issues/497"&gt;#497&lt;/a&gt;) Fix Boost.Build builds on GCC 4.8.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/lexical_cast/"&gt;LexicalCast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Dropped dependency on Boost.Math (thanks to Peter Dimov &lt;a href="https://github.com/boostorg/lexical_cast/issues/37"&gt;#37&lt;/a&gt;,
&lt;a href="https://github.com/boostorg/lexical_cast/issues/39"&gt;#39&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixes for the CI and coverage (thanks to Sam Darwin from "The
C++ Alliance" &lt;a href="https://github.com/boostorg/lexical_cast/issues/38"&gt;#38&lt;/a&gt;, &lt;a href="https://github.com/boostorg/lexical_cast/issues/42"&gt;#42&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/log/"&gt;Log&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Corrected a formal race condition in the thread-safe log record
queue implementation used in the &lt;code&gt;&lt;span class="identifier"&gt;unbounded_fifo_queue&lt;/span&gt;&lt;/code&gt;
policy of the &lt;code&gt;&lt;span class="identifier"&gt;asynchronous_sink&lt;/span&gt;&lt;/code&gt;
frontend. The race could be detected by TSAN, but it was not
a real problem on most current CPU architectures and compilers.
(&lt;a href="https://github.com/boostorg/log/issues/139"&gt;#139&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
When copying a logger with a channel attribute (e.g. &lt;code&gt;&lt;span class="identifier"&gt;channel_logger&lt;/span&gt;&lt;/code&gt;), the channel
attribute is now deep-copied from the original logger. This
means that modifying the channel in the new logger will no
longer affect the original logger.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Replaced the use of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;allocator&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="keyword"&gt;void&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; in template parameters
with a new tag type &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;log&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;use_std_allocator&lt;/span&gt;&lt;/code&gt;
to silence libc++ warnings about the former being deprecated
in C++17 and later. The tag indicates that the instantiated
template should be using a specialization of &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;allocator&lt;/span&gt;&lt;/code&gt; internally to allocate
dynamic memory, so the change has no functional effect. (&lt;a href="https://github.com/boostorg/log/issues/141"&gt;#141&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Boost.Log no longer defines &lt;code&gt;&lt;span class="identifier"&gt;__MSVCRT_VERSION__&lt;/span&gt;&lt;/code&gt;
macro on MinGW and MinGW-w64. Defining this macro caused incompatibility
with UCRT, which is available as an option in recent MinGW-w64.
(&lt;a href="https://github.com/boostorg/log/pull/149"&gt;PR#149&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/libs/log/doc/html/log/changelog.html"&gt;changelog&lt;/a&gt;
for more details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/math/"&gt;Math&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Breaking Change:&lt;/strong&gt; C++03 support is
now removed, a C++11 or later conformant compiler is now required
to use this library.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;span class="link"&gt;Z-test&lt;/span&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added execution policy support to univariate and bivariate statistics:
enables parallel execution (requires C++17 and &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;execution&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Big update/improvement on CI testing.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bivariate statistics now have integer support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
T-Test now has integer support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Linear regression now has integer support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct PDF of the beta distribution at the endpoints.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct use of Stirling's approximation in certain multiprecision
cases, fixes &lt;a href="https://github.com/boostorg/math/issues/396"&gt;#396&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Eliminate -Wimplicit-int-float-conversion on clang.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix some constexpr issues in quaternion/octonion.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Minor performance fix to tanh_sinh integration.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update hypergeometric functions internal scaling to allow for 64-bit
(long long) exponents with multiprecision types.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/move/"&gt;Move&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/move/issues/35"&gt;Git Issue
#35: &lt;em&gt;"New nothrow move traits are incomplete"&lt;/em&gt;&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/multiprecision/"&gt;Multiprecision&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING CHANGE&lt;/strong&gt;: Massive refactoring
and code simplification makes C++11 an absolute requirement.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Use BOOST_TRY/CATCH in headers so code can be used in exception-free
environments.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct corner case in pow, fixes &lt;a href="https://github.com/boostorg/multiprecision/issues/277"&gt;#277&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct exception type thrown to match docs in lsb/msb: fixes &lt;a href="https://github.com/boostorg/multiprecision/issues/257"&gt;#257&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Allow moves and operators between related but different types (ie
types with the same allocator), fixes &lt;a href="https://github.com/boostorg/multiprecision/issues/278"&gt;#278&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/nowide/"&gt;Nowide&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix discarding of characters for text file streams when seek or sync
functions are used and newlines were converted (e.g. on Windows)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix potential use-after-free bug when reusing (via &lt;code&gt;&lt;span class="identifier"&gt;open&lt;/span&gt;&lt;/code&gt;) a file stream that has been
closed
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix potential invalid memory access when using a file stream that
has been moved or swapped to where the source had a put-back character
or was set to unbuffered mode
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix compatibility with ucrt runtime by not defining &lt;code&gt;&lt;span class="identifier"&gt;__MSVCRT_VERSION__&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Known issues: Read performance for text files is degraded. Binary
files and writing is unaffected.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/optional/"&gt;Optional&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed MSVC warning C4702.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/outcome/"&gt;Outcome&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Announcements:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
BREAKING CHANGE: After a year and three major Boost releases
announcing this upcoming change, this is the FIRST RELEASE
of the v2.2 branch. This branch has a number of major breaking
changes to the Outcome v2.1 which shipped in Boost 1.75 and
earlier, see the documentation for details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enhancements:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
VS2019.8 changed how to enable Coroutines, which caused Outcome
to not compile on that compiler.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
If on C++ 20, we now use C++ 20 &lt;code&gt;&lt;span class="special"&gt;[[&lt;/span&gt;&lt;span class="identifier"&gt;likely&lt;/span&gt;&lt;span class="special"&gt;]]&lt;/span&gt;&lt;/code&gt;
instead of compiler-specific markup to indicate when TRY has
likely success or failure.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
BREAKING CHANGE: Previously the value of &lt;code&gt;&lt;span class="identifier"&gt;spare_storage&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="keyword"&gt;const&lt;/span&gt;
&lt;span class="identifier"&gt;basic_result&lt;/span&gt;&lt;span class="special"&gt;|&lt;/span&gt;&lt;span class="identifier"&gt;basic_outcome&lt;/span&gt; &lt;span class="special"&gt;*)&lt;/span&gt;
&lt;span class="keyword"&gt;noexcept&lt;/span&gt;&lt;/code&gt; was not propagated
over &lt;code&gt;&lt;span class="identifier"&gt;BOOST_OUTCOME_TRY&lt;/span&gt;&lt;/code&gt;,
which causes things like stack backtraces captured at the point
of construction of an errored result to get dropped at every
&lt;code&gt;&lt;span class="identifier"&gt;TRY&lt;/span&gt;&lt;/code&gt; point.
This has been fixed by adding an optional &lt;code&gt;&lt;span class="identifier"&gt;spare_storage&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;success_type&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;failure_type&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;, as well as to &lt;code&gt;&lt;span class="keyword"&gt;auto&lt;/span&gt; &lt;span class="identifier"&gt;success&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;
&lt;span class="special"&gt;&amp;amp;&amp;amp;,&lt;/span&gt; &lt;span class="special"&gt;...)&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="keyword"&gt;auto&lt;/span&gt; &lt;span class="identifier"&gt;failure&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;T&lt;/span&gt;
&lt;span class="special"&gt;&amp;amp;&amp;amp;,&lt;/span&gt; &lt;span class="special"&gt;...)&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Boost.Outcome should now compile with &lt;code&gt;&lt;span class="identifier"&gt;BOOST_NO_EXCEPTIONS&lt;/span&gt;&lt;/code&gt;
defined. Thanks to Emil, maintainer of Boost.Exception, making
a change for me, Boost.Outcome should now compile with C++
exceptions globally disabled. You won't be able to use &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;exception_ptr&lt;/span&gt;&lt;/code&gt; as it can't
be included if C++ exceptions are globally disabled.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
BREAKING CHANGE &lt;a href="https://github.com/ned14/outcome/issues/244"&gt;#244&lt;/a&gt;
It came as a shock to learn that &lt;code&gt;&lt;span class="identifier"&gt;BOOST_OUTCOME_TRY&lt;/span&gt;&lt;/code&gt;
had been broken since the inception of this library for certain
corner case code, which required a breaking change in how TRY
works. See &lt;a href="https://boostorg.github.io/outcome/changelog.html"&gt;the
changelog in the documentation for more detail&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/parameter/"&gt;Parameter&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for MSVC 2015 code miscompilation when an rvalue
was used as a default value of a named parameter of a function. (&lt;a href="https://github.com/boostorg/parameter/pull/109"&gt;PR#109&lt;/a&gt;,
&lt;a href="https://github.com/boostorg/log/issues/132"&gt;#132&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/pfr/"&gt;PFR&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed reflection of types with missing &lt;code&gt;&lt;span class="keyword"&gt;const&lt;/span&gt;&lt;/code&gt;
in SFINAE expressions in template constructor. Now reflection of
aggregates with &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;optional&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;chrono&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;duration&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;???&amp;gt;&amp;gt;&lt;/span&gt;&lt;/code&gt; fields works on any
Standard Library implementation, even if LWG3050 is not fixed.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Comparison functions are now &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt;
&lt;a href="https://github.com/boostorg/pfr/issues/52"&gt;#52&lt;/a&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed numerous typos in docs (thanks to Phil Miller &lt;a href="https://github.com/boostorg/pfr/issues/63"&gt;#63&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/poly_collection/"&gt;PolyCollection&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Worked around &lt;a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95888"&gt;GCC
bug&lt;/a&gt; affecting GCC versions 9.3-10.2 (issue &lt;a href="https://github.com/boostorg/poly_collection/issues/20"&gt;#20&lt;/a&gt;).
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/predef/"&gt;Predef&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Version 1.13
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;ARCH_PPC_64&lt;/span&gt;&lt;/code&gt; predef.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix &lt;code&gt;&lt;span class="identifier"&gt;ARCH_WORD_BITS&lt;/span&gt;&lt;span class="special"&gt;*&lt;/span&gt;&lt;/code&gt; redefinition warnings/errors.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;ARCH_E2K&lt;/span&gt;&lt;/code&gt;, Elbrus
2000, architecture from Konstantin Ivlev.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix not handling recent C++ version that go above 10.x version.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Version 1.12
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Switch to using the endian.h header on OpenBSD. (Brad Smith)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix not handling recent versions of stdcxx that go above version
9.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix including sub-BSD OS headers directly causing redef warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add CI testing of direct inclusion of all headers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add CI testing on FreeBSD for clang and gcc.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;WORD_BITS&lt;/span&gt;&lt;/code&gt; set
of predefs to detect the architecture word size. Initial implementation
inspired by submission from Mikhail Komarov.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add CI testing for Cygwin 32 and 64.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/property_tree/"&gt;PropertyTree&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Property Tree has a new maintainer.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix usage of deprecated Boost.Bind features.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Link to Wikipedia fixed.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Use BOOST_OVERRIDE to fix GCC warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add extensive CI testing.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/regex/"&gt;Regex&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Regex is now header only except in C++03 mode.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Support for C++03 is now deprecated.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The library can now be used "standalone" without the rest
of Boost being present.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/stacktrace/"&gt;Stacktrace&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Better support for pre-C++11 builds on clang &lt;a href="https://github.com/boostorg/stacktrace/issues/102"&gt;#102&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bigger warning for &lt;strong&gt;do not use boost::stacktrace::stacktrace
in signal handlers&lt;/strong&gt; &lt;a href="https://github.com/boostorg/stacktrace/issues/71"&gt;#71&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/type_traits/"&gt;TypeTraits&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix for Visual Studio managed code projects.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/variant2/"&gt;Variant2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Improved generated code for the double buffered case.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_76_0.updated_tools"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Tools&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/tools/build/"&gt;Build&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Includes release of &lt;a href="https://www.boost.org/tools/build/doc/html/#_version_4_4_1"&gt;B2
version 4.4.1&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_76_0.compilers_tested"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Compilers Tested&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost's primary test compilers are:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.0, 4.0.1, 6.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++0x: 3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0,
9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2,
6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.4.7
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Intel, C++14: 18.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++1z: 9.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++2a: 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.6.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.1, 4.9.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.1.0, 7.2.0, 7.3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
FreeBSD:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++1z: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;
Boost's additional test compilers include:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++0x: 3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2,
6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.4.7
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Intel, C++14: 18.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++1z: 9.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++2a: 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.6.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.1, 4.9.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.1.0, 7.2.0, 7.3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
FreeBSD:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++1z: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_76_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow, Michael Caisse and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item><item><title>Version 1.75.0</title><link>https://www.boost.org/users/history/version_1_75_0.html</link><guid>https://www.boost.org/users/history/version_1_75_0.html</guid><pubDate>Fri, 11 Dec 2020 19:50:02 +0000</pubDate><description>
&lt;div id="version_1_75_0.known_issues"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Known Issues&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost.Operators is currently &lt;strong&gt;incompatible with C++20&lt;/strong&gt;
compilers, which in some cases may manifest as an infinite recursion or infinite
loop in runtime when a comparison operator is called. The problem is caused
by the new operator rewriting behavior introduced in C++20. As a workaround,
users are advised to target C++17 or older C++ standard. More details can be
found in &lt;a href="https://github.com/boostorg/utility/issues/65"&gt;#65&lt;/a&gt;.
&lt;/p&gt;
&lt;/div&gt;
&lt;div id="version_1_75_0.new_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;New Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/json/"&gt;JSON&lt;/a&gt;:&lt;/span&gt; JSON parsing, serialization,
and DOM in C++11, from Vinnie Falco and Krystian Stasiowski.
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fast compilation requiring only C++11
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Easy and safe modern API with allocator support
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Compile without Boost, define &lt;code&gt;&lt;span class="identifier"&gt;BOOST_JSON_STANDALONE&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Optional header-only, without linking to a library
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/leaf/"&gt;LEAF&lt;/a&gt;:&lt;/span&gt; A lightweight error-handling
library for C++11, from Emil Dotchevski.
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Small single-header format, no dependencies.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Designed for maximum efficiency ("happy" path and "sad"
path).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
No dynamic memory allocations, even with heavy payloads.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
O(1) transport of arbitrary error types (independent of call stack
depth).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Can be used with or without exception handling.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/pfr/"&gt;PFR&lt;/a&gt;:&lt;/span&gt; Basic reflection without macro
or boilerplate code for user defined types, from Antony Polukhin.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_75_0.updated_libraries"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Updated Libraries&lt;/span&gt;&lt;/h3&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/asio/"&gt;Asio&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Enabled support for UNIX domain sockets on Windows.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added executor-converting construction and assignment to &lt;code&gt;&lt;span class="identifier"&gt;ip&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;basic_resolver&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added compatibility between polymorphic executors and the (deprecated)
handler invocation hook.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;experimental&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;as_single&lt;/span&gt;&lt;/code&gt;
completion token adapter.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for &lt;code&gt;&lt;span class="identifier"&gt;MSG_NOSIGNAL&lt;/span&gt;&lt;/code&gt;
on more platforms by using &lt;code&gt;&lt;span class="identifier"&gt;_POSIX_VERSION&lt;/span&gt;&lt;/code&gt;
to detect whether it is supported.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the ability to compile using libpthread on Windows.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added workarounds for the Intel C++ compiler.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added more support for detecting and optimising for handlers that
have no custom executor.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reduced lock contention for timer cancellation on Windows.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reinstated a previously removed null-pointer check, as it had a measurable
impact on performance.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed the &lt;code&gt;&lt;span class="identifier"&gt;executor&lt;/span&gt;&lt;/code&gt;
concept to test for a const-qualified &lt;code&gt;&lt;span class="identifier"&gt;execute&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;any_executor&lt;/span&gt;&lt;/code&gt;
support for builds without RTTI support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed the &lt;code&gt;&lt;span class="identifier"&gt;thread_pool&lt;/span&gt;&lt;/code&gt;
unit test to work without RTTI support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed C++20 coroutines compatibility with clang on Windows.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed some compatibility issues with Windows Runtime.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed shadow name warnings caused by addition of &lt;code&gt;&lt;span class="identifier"&gt;asio&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;query&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a "logical ‘or’ of equal expressions" warning
on linux.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a benign switch fallthrough warning.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added missing &lt;code&gt;&lt;span class="identifier"&gt;push&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;pop_options&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
includes.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Suppressed zero-as-null-pointer-constant warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a comma-operator warning.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated the documentation to clarify when the &lt;tt&gt;select&lt;/tt&gt;
reactor is used on Windows.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed potential ambiguity caused by &lt;code&gt;&lt;span class="identifier"&gt;any_executor&lt;/span&gt;&lt;/code&gt;
comparisons and conversion.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added detection of non-experimental C++20 coroutines on MSVC 19.8.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compatibility with uClibc.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;strand&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;&lt;/span&gt;&lt;/code&gt;
adaptation of Networking TS executors when targeting older C++ versions
or less conformant compilers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Consult the &lt;a href="https://www.boost.org/doc/libs/1_75_0/doc/html/boost_asio/history.html"&gt;Revision
History&lt;/a&gt; for further details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/atomic/"&gt;Atomic&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Implemented SSE2 and SSE4.1 versions of address lookup algorithm,
which is used in the internal lock pool implementation. This may
improve performance of waiting and notifying operations in heavily
contended cases.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a possible compilation error on AArch64 targets caused by incorrect
instructions generated for bitwise (logical) operations with immediate
constants. (&lt;a href="https://github.com/boostorg/atomic/issues/41"&gt;#41&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This update brings bug fixes and support for the &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ASIO_ENBALE_HANDLER_TRACKING&lt;/span&gt;&lt;/code&gt;
compile flag from Boost.Asio:
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
We'd love to know how you or your company use Beast, consider adding
an entry to the &lt;a href="https://github.com/boostorg/beast/wiki/Companies-and-Individuals-Using-Beast"&gt;Companies
and Individuals Using Beast&lt;/a&gt; list.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/beast/doc/html/beast/release_notes.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/container/"&gt;Container&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
New &lt;code&gt;devector&lt;/code&gt;
container.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs/issues:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/152"&gt;#152&lt;/a&gt; Tree-based containers have troubles with move-only
types.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/156"&gt;#156&lt;/a&gt; Compile error with vector.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/pull/157"&gt;PR#157&lt;/a&gt; Add missing include.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/159"&gt;#159&lt;/a&gt;: pmr::monotonic_buffer_resource crashes on
large single allocations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/160"&gt;#160&lt;/a&gt;: Usage of uses_allocator needs a remove_cvref_t.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/162"&gt;#162&lt;/a&gt;: small_vector on MSVC x86 call-by-value crash.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/161"&gt;#161&lt;/a&gt;: polymorphic_allocator(memory_resource*) non-standard
extension causes headache.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/pull/163"&gt;PR#163&lt;/a&gt;: container_rebind for small_vector with
options.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/165"&gt;#165&lt;/a&gt;: Link error with shared library and memory_resource
inline members.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/pull/166"&gt;PR#166&lt;/a&gt;: Fix encoding error in copyright headers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/pull/167"&gt;PR#167&lt;/a&gt;: error: the address of 'msg' will always
evaluate as 'true' warning with GCC 4.4.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/container/issues/169"&gt;#169&lt;/a&gt;: flood of warnings building dlmalloc_ext_2_8_6.c
on clang11.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/endian/"&gt;Endian&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;endian_arithmetic&lt;/span&gt;&lt;/code&gt;
no longer inherits from &lt;code&gt;&lt;span class="identifier"&gt;endian_buffer&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
When &lt;code&gt;&lt;span class="identifier"&gt;BOOST_ENDIAN_NO_CTORS&lt;/span&gt;&lt;/code&gt;
is defined, the unaligned &lt;code&gt;&lt;span class="identifier"&gt;endian_buffer&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;endian_arithmetic&lt;/span&gt;&lt;/code&gt;
are C++03 PODs, to enable use of &lt;code&gt;&lt;span class="identifier"&gt;__attribute__&lt;/span&gt;&lt;span class="special"&gt;((&lt;/span&gt;&lt;span class="identifier"&gt;packed&lt;/span&gt;&lt;span class="special"&gt;))&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;New:&lt;/strong&gt; Added &lt;code&gt;&lt;span class="identifier"&gt;creation_time&lt;/span&gt;&lt;/code&gt;
operation, which allows to obtain file creation time. (Inspired by
&lt;a href="https://github.com/boostorg/filesystem/pull/134"&gt;PR#134&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The returned value of &lt;code&gt;&lt;span class="identifier"&gt;last_write_time&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;p&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt; &lt;span class="identifier"&gt;ec&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; operation in case of failure has
been changed to a minimal value representable by &lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;time_t&lt;/span&gt;&lt;/code&gt;
instead of -1.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The returned value of &lt;code&gt;&lt;span class="identifier"&gt;hard_link_count&lt;/span&gt;&lt;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;p&lt;/span&gt;&lt;span class="special"&gt;,&lt;/span&gt; &lt;span class="identifier"&gt;ec&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; operation in case of failure has
been changed to &lt;code&gt;&lt;span class="keyword"&gt;static_cast&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;uintmax_t&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;(-&lt;/span&gt;&lt;span class="number"&gt;1&lt;/span&gt;&lt;span class="special"&gt;)&lt;/span&gt;&lt;/code&gt; instead of 0.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On POSIX systems, &lt;code&gt;&lt;span class="identifier"&gt;file_size&lt;/span&gt;&lt;/code&gt;
will now indicate error code &lt;code&gt;&lt;span class="identifier"&gt;errc&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;function_not_supported&lt;/span&gt;&lt;/code&gt;
if the path resolves to a non-regular file. Previously, &lt;code&gt;&lt;span class="identifier"&gt;errc&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;operation_not_permitted&lt;/span&gt;&lt;/code&gt; was reported.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Linux, many operations now use &lt;code&gt;&lt;span class="identifier"&gt;statx&lt;/span&gt;&lt;/code&gt;
system call internally, when possible, which allows to reduce the
amount of information queried from the filesystem and potentially
improve performance. The &lt;code&gt;&lt;span class="identifier"&gt;statx&lt;/span&gt;&lt;/code&gt;
system call was introduced in Linux kernel 4.11.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed &lt;code&gt;&lt;span class="keyword"&gt;const&lt;/span&gt;&lt;/code&gt;-qualification
from return types of some &lt;code&gt;&lt;span class="identifier"&gt;path&lt;/span&gt;&lt;/code&gt;
methods. This could prevent move construction and move assignment
at the call site in some cases. (&lt;a href="https://github.com/boostorg/filesystem/issues/160"&gt;#160&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On OpenBSD 4.4 and newer, use &lt;code&gt;&lt;span class="identifier"&gt;statvfs&lt;/span&gt;&lt;/code&gt;
system call to obtain filesystem space information. (Inspired by
&lt;a href="https://github.com/boostorg/filesystem/pull/162"&gt;PR#162&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, &lt;code&gt;&lt;span class="identifier"&gt;space&lt;/span&gt;&lt;/code&gt;
now returns with an error if the provided path does not idendify
an existing file. (&lt;a href="https://github.com/boostorg/filesystem/issues/167"&gt;#167&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/geometry/"&gt;Geometry&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
WARNING: Following the deprecation notice of C++03 issued with Boost
1.73, from now on the Boost.Geometry requires a capable C++14 compiler.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improvements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/726"&gt;PR#726&lt;/a&gt; Umbrella strategies for area, envelope, expand
(undocumented for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/733"&gt;PR#733&lt;/a&gt; Added example of adaptation of std::array&amp;lt;&amp;gt;
to Point concept (thanks to Ben FrantzDale).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/745"&gt;PR#745&lt;/a&gt; constexpr added in geometries and arithmetic.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/747"&gt;PR#747&lt;/a&gt; Added optional traits::make (undocumented
for now).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/748"&gt;PR#748&lt;/a&gt; Modernized usage of type traits.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/759"&gt;PR#759&lt;/a&gt; MPL_ASSERT replaced with standard static_assert.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/767"&gt;PR#767&lt;/a&gt; Modernized usage of tuple.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Solved issues
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/issues/716"&gt;#716&lt;/a&gt; Dangling proxy references.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bugfixes
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Various fixes in set operations and buffer.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/gil/"&gt;GIL&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
BREAKING: In next release, we are going to drop support for GCC 5.
We may also change the required minimum C++ version from C++11 to
C++14.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/histogram/"&gt;Histogram&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
This update brings
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Bug-fixes for corner-cases
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Small documentation improvements
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixes for new warnings from latest compilers and when compiling
against the C++20 standard
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See the full &lt;a href="https://www.boost.org/libs/histogram/doc/html/histogram/history.html"&gt;Release
Notes&lt;/a&gt; for a complete list of changes.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/interprocess/"&gt;Interprocess&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/interprocess/issues/127"&gt;#127&lt;/a&gt;: static assertion failure with boost interprocess
1.74 and basic_managed_shared_memory.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/intrusive/"&gt;Intrusive&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/intrusive/pull/48"&gt;PR#48&lt;/a&gt;: MSVC "assignment within conditional"
warning fix.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/intrusive/pull/49"&gt;PR#49&lt;/a&gt;: Fix empty control statement warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/intrusive/issues/52"&gt;#52&lt;/a&gt;: Invalid casting in BOOST_INTRUSIVE_BSR_INTRINSIC.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/log/"&gt;Log&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Corrected the file counter that would be used in &lt;code&gt;&lt;span class="identifier"&gt;text_file_backend&lt;/span&gt;&lt;/code&gt; when generating
the target file name (based on the pattern set by &lt;code&gt;&lt;span class="identifier"&gt;set_target_file_name_pattern&lt;/span&gt;&lt;/code&gt;
method) when the log file is rotated. (&lt;a href="https://github.com/boostorg/log/issues/125"&gt;#125&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Replaced a volatile version counter in &lt;code&gt;&lt;span class="identifier"&gt;basic_sink_frontend&lt;/span&gt;&lt;/code&gt;
with an atomic. (&lt;a href="https://github.com/boostorg/log/issues/128"&gt;#128&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In the &lt;code&gt;&lt;span class="identifier"&gt;asynchronous_sink&lt;/span&gt;&lt;/code&gt;
frontend, resolved a possible conflict between &lt;code&gt;&lt;span class="identifier"&gt;flush&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;run&lt;/span&gt;&lt;/code&gt;
methods, if &lt;code&gt;&lt;span class="identifier"&gt;run&lt;/span&gt;&lt;/code&gt;
is called from a user's thread instead of the internal dedicated
thread spawned by the frontend. (&lt;a href="https://github.com/boostorg/log/issues/131"&gt;#131&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
See &lt;a href="https://www.boost.org/libs/log/doc/html/log/changelog.html"&gt;changelog&lt;/a&gt;
for more details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/move/"&gt;Move&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/move/issues/30"&gt;#30&lt;/a&gt;: (void) C-cast is a non-portable way of suppressing
compiler warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/mp11/"&gt;Mp11&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;mp_pairwise_fold&lt;/span&gt;&lt;/code&gt;
(suggested by Barry Revzin)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed &lt;code&gt;&lt;span class="identifier"&gt;mp_invoke&lt;/span&gt;&lt;/code&gt;
(use &lt;code&gt;&lt;span class="identifier"&gt;mp_invoke_q&lt;/span&gt;&lt;/code&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/optional/"&gt;Optional&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;none&lt;/span&gt;&lt;/code&gt; is &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt;-declared.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;a href="https://github.com/boostorg/optional/issues/78"&gt;issue
#78&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/outcome/"&gt;Outcome&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Announcements:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
After a year and three major Boost releases announcing this
upcoming change, this is the FINAL RELEASE of the v2.1 branch.
From Boost 1.76 onwards, the v2.2 branch becomes the default.
This branch has a number of major breaking changes to Outcome
v2.1, see the documentation for details.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enhancements:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The ADL discovered event hooks have been replaced with policy-specified
event hooks instead. This is due to brittleness (where hooks
would quietly self-disable if somebody changed something),
compiler bugs (a difference in compiler settings causes the
wrong hooks, or some but not all hooks, to get discovered),
and end user difficulty in using them at all. The policy-specified
event hooks can be told to default to ADL discovered hooks
for backwards compatibility: set &lt;code&gt;&lt;span class="identifier"&gt;OUTCOME_ENABLE_LEGACY_SUPPORT_FOR&lt;/span&gt;&lt;/code&gt;
to less than &lt;code&gt;&lt;span class="number"&gt;220&lt;/span&gt;&lt;/code&gt;
to enable emulation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve configuring &lt;code&gt;&lt;span class="identifier"&gt;OUTCOME_GCC6_CONCEPT_BOOL&lt;/span&gt;&lt;/code&gt;.
Older GCCs had boolean based concepts syntax, whereas newer
GCCs are standards conforming. However the precise logic of
when to use legacy and conforming syntax was not well understood,
which caused Outcome to fail to compile depending on what options
you pass to GCC. The new logic always uses the legacy syntax
if on GCC 8 or older, otherwise we use conforming syntax if
and only if GCC is in C++ 20 mode or later. This hopefully
will resolve the corner case build failures on GCC.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Bug fixes:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Boost.Outcome should now compile with &lt;code&gt;&lt;span class="identifier"&gt;BOOST_NO_EXCEPTIONS&lt;/span&gt;&lt;/code&gt;
defined. Thanks to Emil, maintainer of Boost.Exception, making
a change for me, Boost.Outcome should now compile with C++
exceptions globally disabled. You won't be able to use &lt;code&gt;&lt;span class="identifier"&gt;boost&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;exception_ptr&lt;/span&gt;&lt;/code&gt; as it can't
be included if C++ exceptions are globally disabled.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/ned14/outcome/issues/236"&gt;#236&lt;/a&gt;
In the Coroutine support the &lt;code&gt;&lt;span class="identifier"&gt;final_suspend&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; was not &lt;code&gt;&lt;span class="keyword"&gt;noexcept&lt;/span&gt;&lt;/code&gt;,
despite being required to be so in the C++ 20 standard. This
has been fixed, but only if your compiler implements &lt;code&gt;&lt;span class="identifier"&gt;noop_coroutine&lt;/span&gt;&lt;/code&gt;. Additionally,
if &lt;code&gt;&lt;span class="identifier"&gt;noop_coroutine&lt;/span&gt;&lt;/code&gt;
is available, we use the much more efficient coroutine handle
returning variant of &lt;code&gt;&lt;span class="identifier"&gt;await_suspend&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; which should significantly
improve codegen and context switching performance.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/polygon/"&gt;Polygon&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
C++20 fixes for &lt;code&gt;&lt;span class="identifier"&gt;event_comparison_type&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;vertex_equality_predicate_type&lt;/span&gt;&lt;/code&gt;,
and &lt;code&gt;&lt;span class="identifier"&gt;voronoi_predicates&lt;/span&gt;&lt;/code&gt;.
(Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/preprocessor/"&gt;Preprocessor&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
When variadic data is empty in C++20 mode with __VA_OPT__ support
the variadic size has been corrected to be 0. This also means that
in this C++20 mode it is now valid to convert to and from empty arrays
and lists and variadic data. The end-user can read the "C++20
Support For Variadic Macros" part of the "variadic macros"
topic for more information about empty variadic data in the library.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The macro BOOST_PP_IS_STANDARD() has been added for identifying if
the currently used preprocessor is a C++ standard conforming preprocessor.
A number of preprocessors which generally work correctly with the
library but need various internal workarounds, including the currently
default VC++ preprocessor, are not considered C++ standard conforming
preprocessors. However most preprocessors, including among others
gcc, clang, and the new but currently non-default VC++ preprocessor
in VS2019, are C++ standard conforming preprocessors.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
For C++ standard conforming preprocessors a number of the limits
defined in the config/limits.hpp can now be changed to higher amounts
for a TU. The end-user should read the "limitations" topic
to understand how and which limits can be changed.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
For C++ standard conforming preprocessors, in order to allow the
maximum number of FOR and WHILE iterations, the beginning 'r' and
'd' iteration numbers in the user-defined macros start at 1 and not
2, as it did in previous releases. This could be a breaking change
if these iteration numbers are used in the user-defined macros (
they probably would not be ), but the change was necessary to fix
some arcane bugs when dealing with numerical/logical operations with
maximum numbers as well to allow the user-defined macros to be called
the correct possible maximum number of times. For non-C++ conforming
preprocessors, this change was not made because those non-conforming
C++ preprocessors generally have limitations which disallow the maximum
number of looping constructs to be run, and it was felt not to introduce
a possible breaking change to those more fragile preprocessors would
be better. It was also felt that besides fixing some arcane preprocessor
bugs and providing the possible maximum number of user-defined macro
invocations, this change could be made because it has never been
documented what the starting 'r' and 'd' iteration numbers actually
are but only that these numbers are incremented for each iteration.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The library has been upgraded to assume variadic macro support for
any compiler working with the library. Ostensibly this means that
the library is now a C++11 on up library, yet most of the major compilers,
including gcc, clang, and VC++, also support variadic macros in C++98/C++03
mode as long as strict compliance to C++98/C++03 is not turned on
when using one of those compilers.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/rational/"&gt;Rational&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix Rational operators to not break under new C++20 &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt;&lt;span class="special"&gt;==&lt;/span&gt;&lt;/code&gt;
rewriting rules. (Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/signals2/"&gt;Signals2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Correct C++ allocator model support to fix compilation in C++20 standards
mode. (Glen Fernandes)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The platform-specific headers &lt;code&gt;&lt;span class="identifier"&gt;windows_error&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;linux_error&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;, and &lt;code&gt;&lt;span class="identifier"&gt;cygwin_error&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
emit deprecation messages and are slated for removal.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The old names for &lt;code&gt;&lt;span class="identifier"&gt;generic_category&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;system_category&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; emit deprecation messages and are
slated for removal.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;failed&lt;/span&gt;&lt;/code&gt; is deprecated and is slated
for removal. &lt;code&gt;&lt;span class="keyword"&gt;operator&lt;/span&gt; &lt;span class="keyword"&gt;bool&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
for &lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;/code&gt;
has been reverted to its old meaning of &lt;code&gt;&lt;span class="identifier"&gt;value&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt; &lt;span class="special"&gt;!=&lt;/span&gt; &lt;span class="number"&gt;0&lt;/span&gt;&lt;/code&gt;. This is done for compatibility with
&lt;code&gt;&lt;span class="identifier"&gt;std&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;/code&gt; as the next release
is expected to improve interoperability with &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;system_error&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;
even further. &lt;em&gt;Note that this does not
affect&lt;/em&gt; &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;failed&lt;/span&gt;&lt;/code&gt;,
which is still alive and well.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The overload of &lt;code&gt;&lt;span class="identifier"&gt;error_condition&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;message&lt;/span&gt;&lt;/code&gt;
that takes a buffer is deprecated and is slated for removal, for
the same reasons. &lt;em&gt;Note that this does
not affect&lt;/em&gt; &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;message&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/numeric/ublas/"&gt;uBLAS&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Correct C++ allocator model support to fix compilation in C++20 standards
mode. (Glen Fernandes and Conrad Poelman)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/vmd/"&gt;VMD&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The VMD number parsing has been upgraded to support the ability for
the end-user to change the number limits in the Preprocessor library.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The macro BOOST_VMD_IS_GENERAL_IDENTIFIER has been added to support
the parsing of input that represents a preprocessor token which matches
the VMD identifier syntax, without having to register the identifier
as a specific identifier.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;span class="library"&gt;&lt;a href="https://www.boost.org/libs/wave/"&gt;Wave&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added new C++20 tokens, including the spaceship operator &amp;lt;=&amp;gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/94"&gt;#94&lt;/a&gt;: fix incorrect behavior of __LINE__ and __FILE__
under rescanning
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_75_0.compilers_tested"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Compilers Tested&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Boost's primary test compilers are:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.0, 4.0.1, 6.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++0x: 3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0,
9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2,
6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0, 9.0.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.4.7, 4.5.3, 4.6.3, 5.4.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.4.7
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 5.5.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Intel, C++14: 18.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 9.1.0, 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++1z: 9.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++2a: 10.0.0, 11.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.6.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.1, 4.9.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.1.0, 7.2.0, 7.3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
FreeBSD:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++1z: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;
Boost's additional test compilers include:
&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Linux:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 3.0, 3.8.1, 3.9.1, 4.0.1, 5.0.2, 6.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++0x: 3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 3.5.0, 3.6.0, 3.7.1, 3.8.0, 3.9.1, 4.0.0, 4.0.1, 5.0.2,
6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++17: 5.0.2, 6.0.1, 7.0.0, 8.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.4.7, 4.5.3, 4.6.3, 4.9.4, 5.4.0, 5.5.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.4.7
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 4.9.4, 5.4.0, 6.4.0, 7.1.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.4.0, 5.5.0, 6.3.0, 6.4.0, 7.1.0, 7.3.0, 8.0.1, 8.1.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.3.0, 8.0.1
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Intel, C++14: 18.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
OS X:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++11: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++14: 9.0.0, 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++17: 9.1.0, 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++1z: 9.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Apple Clang, C++2a: 10.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Windows:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 3.4.5, 4.1.2, 4.2.4, 4.3.3, 4.4.0, 4.5.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++0x: 4.6.4
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.1, 4.9.3
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++14: 5.1.0, 5.2.0, 5.3.0, 6.1.0, 6.2.0, 6.3.0, 6.4.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++17: 7.1.0, 7.2.0, 7.3.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Visual C++: 7.1, 8.0, 9.0, 10.0, 11.0, 12.0, 14.0, 14.1
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
FreeBSD:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Clang: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++14: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++1z: 4.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_75_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow, Michael Caisse and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item>
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