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<rss version="2.0" xmlns:boostbook="urn:boost-org:boostbook" xmlns:atom="http://www.w3.org/2005/Atom">
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<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>
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<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 1.81.0</title><link>https://www.boost.org/users/history/version_1_81_0.html</link><guid>https://www.boost.org/users/history/version_1_81_0.html</guid><pubDate>Thu, 17 Nov 2022 03:53:54 +0000</pubDate><description>
&lt;div id="version_1_81_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/doc/libs/1_81_0_beta1/libs/url/"&gt;URL&lt;/a&gt;:&lt;/span&gt; A library for parsing, modifying,
and printing URLs using only C++11, from Vinnie Falco and Alan de Freitas.
Features include fast compilation, strong invariants, and strict compliance
using a memory-friendly approach.
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_81_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/doc/libs/1_81_0_beta1/libs/beast/"&gt;Beast&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="identifier"&gt;buffers_generator&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;beast&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;http&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;message_generator&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;buffer_ref&lt;/span&gt;&lt;/code&gt;,
so beast buffers can be used with asio.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Support for per-operation cancellation
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
C++20 awaitable examples.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
websocket per-message compression options
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
websocket timeout option api
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
multiple content length error
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Support for default-completion and rebind
&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/doc/libs/1_81_0_beta1/libs/container_hash/"&gt;Container Hash&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Major update.&lt;/strong&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The specializations 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;hash&lt;/span&gt;&lt;/code&gt;
have been removed; it now always calls &lt;code&gt;&lt;span class="identifier"&gt;hash_value&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Support for &lt;code&gt;&lt;span class="identifier"&gt;BOOST_HASH_NO_EXTENSIONS&lt;/span&gt;&lt;/code&gt;
has been removed. The extensions are always enabled.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
All standard containers are now supported. This includes &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;forward_list&lt;/span&gt;&lt;/code&gt; and the unordered
associative containers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
User-defined containers (types that have &lt;code&gt;&lt;span class="identifier"&gt;begin&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;end&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; member functions that return iterators)
are now supported out of the box.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Described structs and classes (those annotated with &lt;code&gt;&lt;span class="identifier"&gt;BOOST_DESCRIBE_STRUCT&lt;/span&gt;&lt;/code&gt; or &lt;code&gt;&lt;span class="identifier"&gt;BOOST_DESCRIBE_CLASS&lt;/span&gt;&lt;/code&gt;) are now supported
out of the box.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;hash_combine&lt;/span&gt;&lt;/code&gt; has
been improved.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The performance (and quality, as a result of the above change) of
string hashing has been improved. &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;hash&lt;/span&gt;&lt;/code&gt;
for strings now passes SMHasher in 64 bit mode.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
The documentation has been substantially revised to reflect the 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/doc/libs/1_81_0_beta1/libs/describe/"&gt;Describe&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
To allow the inclusion of &lt;code&gt;&lt;span class="identifier"&gt;enumerators&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;bases&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;members&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
when the option &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;pedantic&lt;/span&gt;&lt;/code&gt;
is used, the invocation of &lt;code&gt;&lt;span class="identifier"&gt;BOOST_DESCRIBE_ENUM&lt;/span&gt;&lt;/code&gt;
has been moved from &lt;code&gt;&lt;span class="identifier"&gt;modifiers&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
into a separate header, &lt;code&gt;&lt;span class="identifier"&gt;modifier_description&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;.
As a consequence, &lt;code&gt;&lt;span class="identifier"&gt;modifiers&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
no longer includes &lt;code&gt;&lt;span class="keyword"&gt;enum&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;.
Code that has been relying on this implicit inclusion may fail, and
will need to be fixed to include &lt;code&gt;&lt;span class="keyword"&gt;enum&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&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/doc/libs/1_81_0_beta1/libs/locale/"&gt;Locale&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Major update with some breaking changes.&lt;/strong&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
C++11 support is now required, support for C++03 and earlier is dropped
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Some enums have been converted to enum classes - Avoids name clashes
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Replace &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK_LOCALE&lt;/span&gt;&lt;/code&gt;
&amp;amp; &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK&lt;/span&gt;&lt;/code&gt;
by fine-grained configuration options as done in Boost.RegEx
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix detection of libiconv allowing Boost.Locale to be build (again)
on some platforms
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Remove use of and support for &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;auto_ptr&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Make the &lt;code&gt;&lt;span class="identifier"&gt;codecvt&lt;/span&gt;&lt;/code&gt;
using &lt;code&gt;&lt;span class="keyword"&gt;wchar_t&lt;/span&gt;&lt;/code&gt; on Windows
assume/use UTF-16 enconding
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Performance improvements: Make &lt;code&gt;&lt;span class="identifier"&gt;basic_format&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;date_time&lt;/span&gt;&lt;/code&gt; &amp;amp;
&lt;code&gt;&lt;span class="identifier"&gt;hold_ptr&lt;/span&gt;&lt;/code&gt; movable,
Fix use of format cache
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Make Boost.Locale compatible with more ICU versions (especially the
tests)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix RTTI definitions for some classes (visibility issues)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix compatibility of the ICU backend with some libc++ versions
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix return value of some operators to correctly return non-const
&lt;code&gt;&lt;span class="special"&gt;*&lt;/span&gt;&lt;span class="keyword"&gt;this&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix int-overflow on negative roll of years in &lt;code&gt;&lt;span class="identifier"&gt;date_time&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Handle or suppress many warnings which makes the build log cleaner
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for more Windows codepages
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix support for Windows codepages like ISO-2022-JP
&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/doc/libs/1_81_0_beta1/libs/nowide/"&gt;Nowide&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix build failure of tests 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/doc/libs/1_81_0_beta1/libs/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
The macro &lt;code&gt;&lt;span class="identifier"&gt;BOOST_SYSTEM_DISABLE_THREADS&lt;/span&gt;&lt;/code&gt;
can now be defined to disable the use of &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;
(e.g. on single-threaded libstdc++).
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;value_type&lt;/span&gt;&lt;/code&gt;,
&lt;code&gt;&lt;span class="identifier"&gt;error_type&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;in_place_value&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;in_place_error&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;result&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;
Added &lt;code&gt;&lt;span class="identifier"&gt;emplace&lt;/span&gt;&lt;/code&gt; to
&lt;code&gt;&lt;span class="identifier"&gt;result&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;/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/doc/libs/1_81_0_beta1/libs/unordered/"&gt;Unordered&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;Major update.&lt;/strong&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added fast containers &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;unordered_flat_map&lt;/span&gt;&lt;/code&gt;
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;unordered_flat_set&lt;/span&gt;&lt;/code&gt; based on open
addressing.
&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/doc/libs/1_81_0_beta1/libs/variant2/"&gt;Variant2&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added support for &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;json&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;value_from&lt;/span&gt;&lt;/code&gt;
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;json&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;value_to&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/doc/libs/1_81_0_beta1/libs/flyweight/index.html"&gt;Flyweight&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/doc/libs/1_81_0_beta1/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;/ul&gt;
&lt;/div&gt;
&lt;div id="version_1_81_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, 13.0.0, 14.0.0, 15.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0, 15.0.0
&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, 13.0.0,
14.0.0, 15.0.0
&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,
13.0.0, 14.0.0, 15.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0, 15.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.6.3, 11, 12
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 11, 12
&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, 12
&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, 12
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
&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, 14.3
&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_81_0.acknowledgements"&gt;
&lt;h3&gt;&lt;span class="link"&gt;Acknowledgements&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;
Marshall Clow and Glen Fernandes managed this release.
&lt;/p&gt;
&lt;/div&gt;
</description></item><item><title>Version 1.80.0</title><link>https://www.boost.org/users/history/version_1_80_0.html</link><guid>https://www.boost.org/users/history/version_1_80_0.html</guid><pubDate>Wed, 10 Aug 2022 21:25:15 +0000</pubDate><description>
&lt;div id="version_1_80_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;
Config
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Support for libcpp15 which removes &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;unary_function&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;binary_function&lt;/span&gt;&lt;/code&gt;. &lt;a href="https://www.boost.org/patches/1_80_0/0005-config-libcpp15.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;
Filesystem
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Directory iterators may fail to construct for a network share on
Windows prior to 10, see &lt;a href="https://github.com/boostorg/filesystem/pull/246"&gt;PR#246&lt;/a&gt; and &lt;a href="https://github.com/boostorg/filesystem/issues/245"&gt;#245&lt;/a&gt;.
&lt;a href="https://www.boost.org/patches/1_80_0/0001-filesystem-win-fix-dir-it-net-share.patch"&gt;Patch&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;weakly_canonical&lt;/span&gt;&lt;/code&gt;
fails to process paths that start with the "\\?\" prefix,
see &lt;a href="https://github.com/boostorg/filesystem/issues/247"&gt;#247&lt;/a&gt;. &lt;a href="https://www.boost.org/patches/1_80_0/0002-filesystem-fix-weakly-canonical-long-paths.patch"&gt;Patch&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On POSIX systems that don't support &lt;code&gt;&lt;span class="special"&gt;*&lt;/span&gt;&lt;span class="identifier"&gt;at&lt;/span&gt;&lt;/code&gt; APIs, compilation fails due
to a missing include, see &lt;a href="https://github.com/boostorg/filesystem/issues/250"&gt;#250&lt;/a&gt;. &lt;a href="https://www.boost.org/patches/1_80_0/0004-filesystem-posix-fix-no-at-apis-missing-include.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;
Unordered
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Containers are not in a valid state after moving, see &lt;a href="https://github.com/boostorg/unordered/issues/139"&gt;#139&lt;/a&gt;.
&lt;a href="https://www.boost.org/patches/1_80_0/0003-unordered-valid-after-move.patch"&gt;Patch&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix MSVC /RTCc build runtime failures. &lt;a href="https://www.boost.org/patches/1_80_0/0006-unordered-msvc-rtcc.patch"&gt;Patch&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_80_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_80_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 a deduced trailing return type to all asynchronous operations,
to enable the new form of &lt;code&gt;&lt;span class="identifier"&gt;async_result&lt;/span&gt;&lt;/code&gt;
for C++11.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Moved &lt;code&gt;&lt;span class="identifier"&gt;append&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;prepend&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;as_tuple&lt;/span&gt;&lt;/code&gt;,
and &lt;code&gt;&lt;span class="identifier"&gt;deferred&lt;/span&gt;&lt;/code&gt; to the
&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;asio&lt;/span&gt;&lt;/code&gt; namespace, and made them compatible
with C++11.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Made &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;
compatible with C++11.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;buffer&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
overloads for contiguous containers, such as &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;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the ability 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;-based coroutines to directly
&lt;code&gt;&lt;span class="identifier"&gt;co_await&lt;/span&gt;&lt;/code&gt; operations
that are packaged as function objects.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed &lt;code&gt;&lt;span class="identifier"&gt;spawn&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
to be a completion token-based asynchronous operation, and added
support for cancellation. The &lt;code&gt;&lt;span class="identifier"&gt;basic_yield_context&lt;/span&gt;&lt;/code&gt;
token now supports move-only and variadic result types. When targeting
C++11 and later, &lt;code&gt;&lt;span class="identifier"&gt;spawn&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;basic_yield_context&lt;/span&gt;&lt;/code&gt;
are implemented in terms of Boost.Context directly.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;is_async_operation&lt;/span&gt;&lt;/code&gt;
trait and &lt;code&gt;&lt;span class="identifier"&gt;async_operation&lt;/span&gt;&lt;/code&gt;
concept.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the &lt;code&gt;&lt;span class="identifier"&gt;completion_signature_of&lt;/span&gt;&lt;/code&gt;
trait.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added converting move construction/assignment to posix descriptors,
serial ports, pipes, Windows &lt;code&gt;&lt;span class="identifier"&gt;object_handle&lt;/span&gt;&lt;/code&gt;,
Windows stream handles, and Windows random-access handles.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;release&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
member functions to pipes, Windows stream handles, and Windows random-access
handles.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Enabled support for &lt;code&gt;&lt;span class="identifier"&gt;Endpoint&lt;/span&gt;&lt;/code&gt;
implementations that return &lt;code&gt;&lt;span class="keyword"&gt;void&lt;/span&gt;&lt;/code&gt;
pointers from their &lt;code&gt;&lt;span class="identifier"&gt;data&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; member functions, as per the documented
&lt;code&gt;&lt;span class="identifier"&gt;Endpoint&lt;/span&gt;&lt;/code&gt; type requirements.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed &lt;code&gt;&lt;span class="identifier"&gt;all&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;race&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
from &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;,
as &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; covers this functionality.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added source locations to exceptions and error codes produced by
the synchronous and asynchronous operations.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compatibility with OpenSSL 3.0.4 and later.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compatibility with with &lt;tt&gt;-masm=intel&lt;/tt&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Explicitly stated that socket &lt;code&gt;&lt;span class="identifier"&gt;shutdown&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; calls are thread-safe with respect
to certain other synchronous operations on the same socket.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Optimised the move construction of I/O objects where only the executor
type differs.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed the 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;invoke_result&lt;/span&gt;&lt;/code&gt;
for clang/libc++.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed an issue where &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;
initiation incorrectly moved arguments instead of forwarding them.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a sequencing issue in the implementation of &lt;code&gt;&lt;span class="identifier"&gt;post&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;, &lt;code&gt;&lt;span class="identifier"&gt;dispatch&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;
Fixed the &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; implementation to propagate
exceptions from awaited initiation functions through the current
completion handler.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed 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;aligned_alloc&lt;/span&gt;&lt;/code&gt;
with &lt;tt&gt;gcc&lt;/tt&gt; 7.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed to avoid using the soon-to-be-deprecated &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;aligned_storage&lt;/span&gt;&lt;/code&gt;
on newer compilers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed 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;aligned_alloc&lt;/span&gt;&lt;/code&gt;
for older Apple platforms.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed faulty assertions from &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;
implementation.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added defence against Qt-defined macros when building with Intel
C++.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed the implementation of the &lt;code&gt;&lt;span class="identifier"&gt;select_reactor&lt;/span&gt;&lt;/code&gt;,
on Windows, to ensure that any exception resulting from failure to
recreate its interrupter's sockets will be allowed to propagate out
through &lt;code&gt;&lt;span class="identifier"&gt;io_context&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;run&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 various compiler warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Updated all composed operations examples, and the C++11 timeouts
example, to use the new &lt;code&gt;&lt;span class="identifier"&gt;async_result&lt;/span&gt;&lt;/code&gt;
form.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added composed operation and coroutine examples for C++20.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Consult the &lt;a href="https://www.boost.org/doc/libs/1_80_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;
Improved portability of endianness checks on ARM, AArch32 and AArch64
targets. (&lt;a href="https://github.com/boostorg/atomic/issues/59"&gt;#59&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed compilation with MSVC 14.0 (Visual Studio 2015) in C++17 mode.
(&lt;a href="https://github.com/boostorg/atomic/issues/61"&gt;#61&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/filesystem/"&gt;Filesystem&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, added a fallback implementation for querying file attributes
in case if the file cannot be opened with &lt;code&gt;&lt;span class="identifier"&gt;ERROR_ACCESS_DENIED&lt;/span&gt;&lt;/code&gt;
error. This may allow &lt;code&gt;&lt;span class="identifier"&gt;status&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;symlink_status&lt;/span&gt;&lt;/code&gt;
to succeed for system files and directories that are not reparse
points or symlinks. (&lt;a href="https://github.com/boostorg/filesystem/issues/234"&gt;#234&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Windows, added a workaround for FAT/exFAT filesystems that produce
&lt;code&gt;&lt;span class="identifier"&gt;ERROR_INVALID_PARAMETER&lt;/span&gt;&lt;/code&gt;
when querying file attributes. This affected &lt;code&gt;&lt;span class="identifier"&gt;status&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;symlink_status&lt;/span&gt;&lt;/code&gt;,
which reported that files do not exist, and directory iterators,
which failed to construct, as well as other dependent operations.
(&lt;a href="https://github.com/boostorg/filesystem/issues/236"&gt;#236&lt;/a&gt;, &lt;a href="https://github.com/boostorg/filesystem/issues/237"&gt;#237&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Worked around a compilation problem on &lt;a href="https://www.rtems.org/"&gt;RTEMS&lt;/a&gt;.
(&lt;a href="https://github.com/boostorg/filesystem/pull/240"&gt;PR#240&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On Linux, corrected switching to &lt;code&gt;&lt;span class="identifier"&gt;sendfile&lt;/span&gt;&lt;/code&gt;
&lt;code&gt;&lt;span class="identifier"&gt;copy_file&lt;/span&gt;&lt;/code&gt; implementation
if &lt;code&gt;&lt;span class="identifier"&gt;copy_file_range&lt;/span&gt;&lt;/code&gt;
failed with &lt;code&gt;&lt;span class="identifier"&gt;ENOSYS&lt;/span&gt;&lt;/code&gt;
in runtime. The &lt;code&gt;&lt;span class="identifier"&gt;sendfile&lt;/span&gt;&lt;/code&gt;
fallback implementation used to skip the filesystem type check and
could fail for some filesystems.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
On POSIX systems supporting &lt;code&gt;&lt;span class="identifier"&gt;openat&lt;/span&gt;&lt;/code&gt;
and related APIs defined in POSIX.1-2008 and on Windows Vista and
later, improved protection of &lt;code&gt;&lt;span class="identifier"&gt;remove_all&lt;/span&gt;&lt;/code&gt;
against &lt;a href="https://www.cve.org/CVERecord?id=CVE-2022-21658"&gt;CVE-2022-21658&lt;/a&gt;
that was implemented in the previous release. The previous fix could
still result in removing unintended files in &lt;a href="https://github.com/boostorg/filesystem/issues/224#issuecomment-1183738097"&gt;certain
conditions&lt;/a&gt;. Other systems remain vulnerable.
&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;strong&gt;NOTICE:&lt;/strong&gt;
We are planning BREAKING switch to C++17 as minimum required C++ language
version in one or two releases after Boost 1.80 (&lt;a href="https://github.com/boostorg/gil/issues/676"&gt;#676&lt;/a&gt;)
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Added
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added Perona-Malik anisotropic diffusion algorithm
(&lt;a href="https://github.com/boostorg/gil/pull/500"&gt;PR#500&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added histogram class and related functionality
(&lt;a href="https://github.com/boostorg/gil/pull/499"&gt;PR#499&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added histogram equalization feature (&lt;a href="https://github.com/boostorg/gil/pull/514"&gt;PR#514&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added histogram matching algorithm (&lt;a href="https://github.com/boostorg/gil/pull/515"&gt;PR#515&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added ability to stack images either horizontally
(&lt;code&gt;&lt;span class="identifier"&gt;hstack&lt;/span&gt;&lt;/code&gt;) or
vertically (&lt;code&gt;&lt;span class="identifier"&gt;vstack&lt;/span&gt;&lt;/code&gt;)
(&lt;a href="https://github.com/boostorg/gil/pull/506"&gt;PR#506&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added adaptive histogram equalization algorithm
(&lt;a href="https://github.com/boostorg/gil/pull/516"&gt;PR#516&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added Standard Hough Transform and circle rasterization
(&lt;a href="https://github.com/boostorg/gil/pull/512"&gt;PR#512&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2020: Added Bresenham's algorithm for line rasterization
(&lt;a href="https://github.com/boostorg/gil/pull/512"&gt;PR#512&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2021: Added rotation of image by arbitrary angle around
its center (&lt;a href="https://github.com/boostorg/gil/pull/565"&gt;PR#565&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GSoC 2021: Added rasterization support for ellipse based on
"An Efficient Ellipse-Drawing Algorithm" by Jerry
Van Aken (&lt;a href="https://github.com/boostorg/gil/pull/585"&gt;PR#585&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;image&lt;/span&gt;&lt;/code&gt;
constructor from compatible view (&lt;a href="https://github.com/boostorg/gil/pull/520"&gt;PR#520&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added inverse function for affine &lt;code&gt;&lt;span class="identifier"&gt;matrix3x2&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/gil/pull/527"&gt;PR#527&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added standard morphological transformations (&lt;a href="https://github.com/boostorg/gil/pull/541"&gt;PR#541&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;for_each_pixel&lt;/span&gt;&lt;/code&gt;
overload for &lt;code&gt;&lt;span class="identifier"&gt;any_image&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/gil/pull/648"&gt;PR#648&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added C++17 polymorphic memory resource typedefs for &lt;code&gt;&lt;span class="identifier"&gt;image&lt;/span&gt;&lt;/code&gt; class (&lt;a href="https://github.com/boostorg/gil/pull/529"&gt;PR#529&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Changed
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING:&lt;/strong&gt; The required minimum
C++ version is changed from from C++11 to C++14. Currently,
large parts of GIL still compile with a C++11 compiler. However,
there is no guarantee that it stays that way, and any compilers
that do not support at least C++14 are considered unsupported
as of now.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;any_color_converted_view&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; is deprecated and will be
removed in the next release. Use &lt;code&gt;&lt;span class="identifier"&gt;color_converted_view&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt; instead, which provides the
same feature.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING:&lt;/strong&gt; &lt;code&gt;&lt;span class="identifier"&gt;apply_operation&lt;/span&gt;&lt;/code&gt;
for &lt;code&gt;&lt;span class="identifier"&gt;any_image&lt;/span&gt;&lt;/code&gt;
is deprecated and will be removed in the next release. Use
&lt;code&gt;&lt;span class="identifier"&gt;variant2&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;visit&lt;/span&gt;&lt;/code&gt; instead, which provides
the same feature. (&lt;a href="https://github.com/boostorg/gil/pull/656"&gt;PR#656&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Moved numeric extension to core (&lt;a href="https://github.com/boostorg/gil/pull/573"&gt;PR#573&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for C++17's &lt;code&gt;&lt;span class="special"&gt;&amp;lt;&lt;/span&gt;&lt;span class="identifier"&gt;filesystem&lt;/span&gt;&lt;span class="special"&gt;&amp;gt;&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/gil/pull/636"&gt;PR#636&lt;/a&gt;) The availability of the &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;filesystem&lt;/span&gt;&lt;/code&gt;
is detected automatically, unless the &lt;code&gt;&lt;span class="identifier"&gt;BOOST_GIL_IO_USE_BOOST_FILESYSTEM&lt;/span&gt;&lt;/code&gt;
macro is defined that forces the preference of the Boost.Filesystem.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Renamed &lt;code&gt;&lt;span class="identifier"&gt;pixel_multiply_t&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;pixel_multiplies_t&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;pixel_divide_t&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;pixel_divides_t&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/gil/pull/655"&gt;PR#655&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Renamed &lt;code&gt;&lt;span class="identifier"&gt;io&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;dynamic_io_new&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
to &lt;code&gt;&lt;span class="identifier"&gt;io&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;detail&lt;/span&gt;&lt;span class="special"&gt;/&lt;/span&gt;&lt;span class="identifier"&gt;dynamic&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt; (&lt;a href="https://github.com/boostorg/gil/pull/653"&gt;PR#653&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Moved function &lt;code&gt;&lt;span class="identifier"&gt;construct_matched&lt;/span&gt;&lt;/code&gt;
into &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;gil&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;detail&lt;/span&gt;&lt;/code&gt;
namespace as it was only used by other implementation details
(&lt;a href="https://github.com/boostorg/gil/pull/653"&gt;PR#653&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Made &lt;code&gt;&lt;span class="identifier"&gt;packed_pixel&lt;/span&gt;&lt;/code&gt;
trivially copyable and assignable (&lt;a href="https://github.com/boostorg/gil/pull/679"&gt;PR#679&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Replace deprecated libtiff v4.3 typedefs with C99 fixed-size
integers (&lt;a href="https://github.com/boostorg/gil/pull/685"&gt;PR#685&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;strong&gt;BREAKING:&lt;/strong&gt; Removed support
for GCC 5 (&lt;a href="https://github.com/boostorg/gil/pull/572"&gt;PR#572&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed deprecated.hpp (&lt;a href="https://github.com/boostorg/gil/pull/627"&gt;PR#627&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed conversion from RGB to HSL (&lt;a href="https://github.com/boostorg/gil/pull/505"&gt;PR#505&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed conversion from RGB to signed CMYK (&lt;a href="https://github.com/boostorg/gil/pull/522"&gt;PR#522&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed unnecessary numeric cast in hsv.hpp (&lt;a href="https://github.com/boostorg/gil/pull/530"&gt;PR#530&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed default constructor for &lt;code&gt;&lt;span class="identifier"&gt;homogeneous_color_base&lt;/span&gt;&lt;/code&gt;
for reference pixel elements (&lt;a href="https://github.com/boostorg/gil/pull/542"&gt;PR#542&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed returning reference to local temporary object in &lt;code&gt;&lt;span class="identifier"&gt;subchroma_image_view&lt;/span&gt;&lt;/code&gt; (&lt;a href="https://github.com/boostorg/gil/pull/556"&gt;PR#556&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added missing header guards in diffusion.hpp (&lt;a href="https://github.com/boostorg/gil/pull/568"&gt;PR#568&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;any_image_view&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;::&lt;/span&gt;&lt;span class="identifier"&gt;const_t&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/gil/pull/526"&gt;PR#526&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed C++20 incompatibilities in I/O extensions (&lt;a href="https://github.com/boostorg/gil/pull/617"&gt;PR#617&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Ensured all examples build without errors (&lt;a href="https://github.com/boostorg/gil/pull/628"&gt;PR#628&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;convolve_2d&lt;/span&gt;&lt;/code&gt;
for images with &lt;code&gt;&lt;span class="identifier"&gt;float32_t&lt;/span&gt;&lt;/code&gt;
channel model (&lt;a href="https://github.com/boostorg/gil/pull/577"&gt;PR#577&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed &lt;code&gt;&lt;span class="identifier"&gt;for_each_pixel&lt;/span&gt;&lt;/code&gt;
for non-1d iterable views (&lt;a href="https://github.com/boostorg/gil/pull/621"&gt;PR#621&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed: &lt;code&gt;&lt;span class="identifier"&gt;is_equal_to_sixteen&lt;/span&gt;&lt;/code&gt;
in PNG I/O was less-than test (&lt;a href="https://github.com/boostorg/gil/pull/650"&gt;PR#650&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Re-allow &lt;code&gt;&lt;span class="identifier"&gt;devicen_t&lt;/span&gt;&lt;/code&gt;
with two components (&lt;a href="https://github.com/boostorg/gil/pull/654"&gt;PR#654&lt;/a&gt;) It was unintentionally removed
in Boost 1.72
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed memory leak in &lt;code&gt;&lt;span class="identifier"&gt;image&lt;/span&gt;&lt;/code&gt;
class for empty dimensions (&lt;a href="https://github.com/boostorg/gil/pull/649"&gt;PR#649&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Acknowledgements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Cypre55, Samuel Debionne, Mike-Devel, Edward Diener, Peter
Dimov, Omar Emara, Dhruva Gole, Nicolas Herry, Eugene K, Avinal
Kumar, Gaurav Kumar, Marco Langer, Pranam Lashkari, Mateusz
Łoskot, Giovanni Mascellani, Debabrata Mandal, Gopi Krishna
Menon, René Ferdinand Rivera Morell, Felix Morgner, Harshit
Pant, Paul92, André Schröder, Scramjet911, Siddharth, Dirk
Stolle, Prathamesh Tagore, theroyn, Olzhas Zhumabek
&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/atomic/"&gt;Graph&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;
Fix bug in &lt;code&gt;&lt;span class="identifier"&gt;stoer_wagner_min_cut&lt;/span&gt;&lt;/code&gt;
where vertices are not merged at the end of each mincut phase
(&lt;a href="https://github.com/boostorg/graph/issues/286"&gt;#286&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix conversion warning for return type of &lt;code&gt;&lt;span class="identifier"&gt;strong_components&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/graph/issues/293"&gt;#293&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix compilation failure of &lt;code&gt;&lt;span class="identifier"&gt;boykov_kolmogorov_max_flow&lt;/span&gt;&lt;/code&gt;
named parameter overload (&lt;a href="https://github.com/boostorg/graph/issues/232"&gt;#232&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
General code improvements:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Remove redundant call to &lt;code&gt;&lt;span class="identifier"&gt;combine&lt;/span&gt;&lt;/code&gt;
in &lt;code&gt;&lt;span class="identifier"&gt;astar_search_no_init_tree&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/graph/issues/260"&gt;#260&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Remove redundant &lt;code&gt;&lt;span class="identifier"&gt;child_idx&lt;/span&gt;&lt;/code&gt;
argument of &lt;code&gt;&lt;span class="identifier"&gt;d_ary_heap_indirect&lt;/span&gt;&lt;span class="special"&gt;&amp;lt;&amp;gt;::&lt;/span&gt;&lt;span class="identifier"&gt;child&lt;/span&gt;&lt;/code&gt;
(&lt;a href="https://github.com/boostorg/graph/issues/261"&gt;#261&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve documentation for traversal categories (&lt;a href="https://github.com/boostorg/graph/issues/303"&gt;#303&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Acknowledgements
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Viktor Pti, Sebastian Brockmeyer, Etienne dg
&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/histogram/"&gt;Histogram&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fixed segfault in &lt;code&gt;&lt;span class="identifier"&gt;indexed&lt;/span&gt;&lt;/code&gt;
when trying to iterate over histogram with axes of zero size (physical
or logical) under certain conditions
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed previously deprecated API
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
class &lt;code&gt;&lt;span class="identifier"&gt;accumulators&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;thread_safe&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;accumulators&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;&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="keyword"&gt;true&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;
Methods &lt;code&gt;&lt;span class="identifier"&gt;accumulators&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;sum&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;large&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;accumulators&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;sum&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;small&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;accumulators&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;sum&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;large_part&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;accumulators&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;sum&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;small_part&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Type alias &lt;code&gt;&lt;span class="identifier"&gt;algorithm&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;reduce_option&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;algorithm&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;reduce_command&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Template function &lt;code&gt;&lt;span class="identifier"&gt;axis&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;traits&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;static_options&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;axis&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;traits&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;get_options&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Template function &lt;code&gt;&lt;span class="identifier"&gt;axis&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;traits&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;static_is_inclusive&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;axis&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;traits&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;is_inclusive&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Type alias &lt;code&gt;&lt;span class="identifier"&gt;indexed&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;range_iterator&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;indexed&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;iterator&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Type alias &lt;code&gt;&lt;span class="identifier"&gt;indexed&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;accessor&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;reference&lt;/span&gt;&lt;/code&gt;:
use &lt;code&gt;&lt;span class="identifier"&gt;indexed&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;accessor&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;const_reference&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;/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;
For C++11 and later, added support for perfect forwarding of values
written to &lt;code&gt;&lt;span class="identifier"&gt;function_output_iterator&lt;/span&gt;&lt;/code&gt;.
(&lt;a href="https://github.com/boostorg/iterator/pull/73"&gt;PR#73&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added protection against writing to &lt;code&gt;&lt;span class="identifier"&gt;function_output_iterator&lt;/span&gt;&lt;/code&gt;
a result of dereferencing another &lt;code&gt;&lt;span class="identifier"&gt;function_output_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;
Added non-const &lt;code&gt;&lt;span class="identifier"&gt;value&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;at&lt;/span&gt;&lt;/code&gt;
overloads.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added the ability to manually choose endianness of the platform.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;string&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;subview&lt;/span&gt;&lt;span class="special"&gt;()&lt;/span&gt;&lt;/code&gt;
overload.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed segfault in &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;span class="special"&gt;(&lt;/span&gt;&lt;span class="identifier"&gt;it&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 low performance of &lt;code&gt;&lt;span class="identifier"&gt;serialize&lt;/span&gt;&lt;/code&gt;
on libc++.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed ambigious conversion 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;
on GCC 8.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed parsing on big-endian platforms.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed handling of comment after trailing comma.
&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;
API breaking change: throw leaf::exception(....) now becomes leaf::throw_exception(....)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed a bug in support for a rare build configuration (exception
handling enabled, diagnostics disabled)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Using nullptr instead of 0 throughout
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fixed pedantic warnings
&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/locale/"&gt;Locale&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Deprecated support for C++03 and earlier, C++11 will be required
in the next release
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Provide &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK_LOCALE&lt;/span&gt;&lt;/code&gt;
as a temporary replacement for &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK&lt;/span&gt;&lt;/code&gt; which is incompatible
with Boost.Regex. &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK_LOCALE&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="special"&gt;-&lt;/span&gt;&lt;span class="identifier"&gt;sICU_LINK&lt;/span&gt;&lt;/code&gt;
are deprecated and will be replaced by &lt;code&gt;&lt;span class="identifier"&gt;ICU_&lt;/span&gt;&lt;span class="special"&gt;*&lt;/span&gt;&lt;span class="identifier"&gt;_NAME&lt;/span&gt;&lt;/code&gt;
options to be compatible with Boost.Regex
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix UB/assertion failure in the ICU &lt;code&gt;&lt;span class="identifier"&gt;collator&lt;/span&gt;&lt;/code&gt;
implementation when transforming empty strings
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix some issues related to visibility of classes in shared libraries
(Unix only)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix compatibility with C++20 mode
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix compatibility with &lt;code&gt;&lt;span class="identifier"&gt;BOOST_USE_WINDOWS_H&lt;/span&gt;&lt;/code&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix build failures due to missing includes
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Handle or suppress many warnings which makes the build log cleaner
&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;
Fixed binding incorrect local address in UDP socket-based
&lt;code&gt;&lt;span class="identifier"&gt;syslog_backend&lt;/span&gt;&lt;/code&gt;
when IPv6 address is used for the syslog server. (&lt;a href="https://github.com/boostorg/log/issues/181"&gt;#181&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a workaround for a &lt;a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105857"&gt;bug&lt;/a&gt;
in libstdc++ from gcc 11.2. When &lt;code&gt;&lt;span class="identifier"&gt;max_size_decor&lt;/span&gt;&lt;/code&gt;
was used on a formatting stream, &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;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;do_length&lt;/span&gt;&lt;/code&gt;
incorrectly accessed the input buffer and caused a buffer overflow.
&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;Deprecated C++11 support&lt;/strong&gt;: from 2023
we will require C++14 as a minimum standard. This will mean GCC-5
or MSVC-14.1 as a minimal requirement.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt; fma support,
see &lt;a href="https://github.com/boostorg/math/pull/734"&gt;734&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add support for the Chatterjee Correlation Coefficient, see &lt;a href="https://github.com/boostorg/math/pull/770"&gt;770&lt;/a&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added support for the logarithm of the PDF for all the distributions.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Improve support for building with no exception or RTTI support.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Some minor bug fixes for [sub 1]F[sub 1] corner cases, see &lt;a href="https://github.com/boostorg/math/pull/778"&gt;778&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;Mark C++11 support as deprecated&lt;/strong&gt;:
from 2023 we will move to requiring C++14 as a minimum standard level.
That will drop support for GCC versions prior to 5 and MSVC prior
to 14.1.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix conflict between &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;cstdfloat&lt;/span&gt;&lt;span class="special"&gt;.&lt;/span&gt;&lt;span class="identifier"&gt;hpp&lt;/span&gt;&lt;/code&gt;
and this library.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clean up lots of gcc and clang warnings.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix input streaming of composite types (complex, interval rational)
where there is a trailing delimeter in the stream and no whitespace.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix &lt;code&gt;&lt;span class="keyword"&gt;constexpr&lt;/span&gt;&lt;/code&gt; integer
square root where the input is 1, 2 or 3.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add missing &lt;code&gt;&lt;span class="preprocessor"&gt;#include&lt;/span&gt;&lt;/code&gt;
of &lt;code&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; to float128.hpp.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct 2-arg constructor for class &lt;code&gt;&lt;span class="identifier"&gt;number&lt;/span&gt;&lt;/code&gt;
to prevent ambiguity in some cases.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Correct and make more consistent behaviour of divide-by-zero in gmp.hpp.
&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;
Major performance improvement for Bulk I/O with files
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;basic_filebuf&lt;/span&gt;&lt;/code&gt;: Fix
wrong return value of &lt;code&gt;&lt;span class="identifier"&gt;sync&lt;/span&gt;&lt;/code&gt;
when &lt;code&gt;&lt;span class="identifier"&gt;fflush&lt;/span&gt;&lt;/code&gt; failed
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;basic_filebuf&lt;/span&gt;&lt;/code&gt;: Fix
possible undefined behavior in a corner case when nothing was actually
written but buffer is in "write" mode
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;code&gt;&lt;span class="identifier"&gt;basic_filebuf&lt;/span&gt;&lt;/code&gt;: Limit
putback of characters (i.e. &lt;code&gt;&lt;span class="identifier"&gt;pbackfail&lt;/span&gt;&lt;/code&gt;)
only allowing putback of buffered characters (may be only 1 character)
&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;
Added specializations for &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;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;optional&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;&amp;gt;&lt;/span&gt;&lt;/code&gt;. This is a breaking change
for programs that define such specializations themselves. For more
details see &lt;a href="https://www.boost.org/libs/optional/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___std__hash_specializations.html#reference_std_hash_spec"&gt;specs&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/stl_interfaces/"&gt;STLInterfaces&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Fix &lt;a href="https://github.com/boostorg/stl_interfaces/issues/53"&gt;#53&lt;/a&gt;: "missing 'typename' prior to dependent
type name 'C::const_iterator'"
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Fix &lt;a href="https://github.com/boostorg/stl_interfaces/issues/54"&gt;#54&lt;/a&gt;: "Concept check fails on .data() of
a view on contiguous iterator_interface instantiations"
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
New additions to make it easy to write views and view adaptors that
work like, and interoperate with, the ones in the standard library:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
Add workalikes for C++23'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;bind_back&lt;/span&gt;&lt;span class="special"&gt;()&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;range_adaptor_closure&lt;/span&gt;&lt;/code&gt;
for pre-C++23 code.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Add templates &lt;code&gt;&lt;span class="identifier"&gt;closure&lt;/span&gt;&lt;/code&gt;
and &lt;code&gt;&lt;span class="identifier"&gt;adaptor&lt;/span&gt;&lt;/code&gt;
to make writing view adaptors easier, following the examples
in &lt;a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2387r3.html"&gt;P2387&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/system/"&gt;System&lt;/a&gt;:&lt;/span&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
When an &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;
is converted 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_code&lt;/span&gt;&lt;/code&gt;
and then back to &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;,
the original is now restored, if possible.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Reworked the conversion 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; to avoid the one-time
allocation that shows up on leak checkers.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a constructor that allows replacing the source location of
an &lt;code&gt;&lt;span class="identifier"&gt;error_code&lt;/span&gt;&lt;/code&gt;, and
a corresponding &lt;code&gt;&lt;span class="identifier"&gt;assign&lt;/span&gt;&lt;/code&gt;.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added a converting constructor to &lt;code&gt;&lt;span class="identifier"&gt;result&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/unordered/"&gt;Unordered&lt;/a&gt;:&lt;/span&gt;
Major update:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://www.boost.org/libs/unordered/doc/html/unordered.html#buckets_fast_closed_addressing_implementation"&gt;Refactor&lt;/a&gt;
internal implementation to be dramatically faster
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Allow &lt;code&gt;&lt;span class="identifier"&gt;final&lt;/span&gt;&lt;/code&gt; &lt;code&gt;&lt;span class="identifier"&gt;Hasher&lt;/span&gt;&lt;/code&gt; and &lt;code&gt;&lt;span class="identifier"&gt;KeyEqual&lt;/span&gt;&lt;/code&gt;
objects
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Update documentation, adding benchmark graphs and notes on the new
internal data structures
&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;
In &lt;code&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;string_ref&lt;/span&gt;&lt;/code&gt;, fixed &lt;code&gt;&lt;span class="identifier"&gt;max_size&lt;/span&gt;&lt;/code&gt; returning incorrect value.
(&lt;a href="https://github.com/boostorg/utility/issues/91"&gt;#91&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Removed &lt;code&gt;&lt;span class="keyword"&gt;noexcept&lt;/span&gt;&lt;/code&gt; specifier
from &lt;code&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;compare&lt;/span&gt;&lt;/code&gt;
as it may throw on some input arguments. (&lt;a href="https://github.com/boostorg/utility/issues/94"&gt;#94&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;string_ref&lt;/span&gt;&lt;/code&gt;, added support for calling
&lt;code&gt;&lt;span class="identifier"&gt;substr&lt;/span&gt;&lt;/code&gt; with no arguments.
(&lt;a href="https://github.com/boostorg/utility/issues/96"&gt;#96&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Added &lt;code&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;span class="special"&gt;::&lt;/span&gt;&lt;span class="identifier"&gt;contains&lt;/span&gt;&lt;/code&gt;
methods that were introduced in C++23. (&lt;a href="https://github.com/boostorg/utility/issues/93"&gt;#93&lt;/a&gt;)
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
In &lt;code&gt;&lt;span class="identifier"&gt;string_view&lt;/span&gt;&lt;/code&gt;, added
asserts in &lt;code&gt;&lt;span class="identifier"&gt;remove_prefix&lt;/span&gt;&lt;/code&gt;/&lt;code&gt;&lt;span class="identifier"&gt;remove_suffix&lt;/span&gt;&lt;/code&gt; methods to enforce
the precondition that the prefix/suffix length does not exceed the
string view size. The previous (undocumented) behavior of silently
clamping the prefix/suffix length is deprecated and will be removed
in a future release. (&lt;a href="https://github.com/boostorg/utility/issues/92"&gt;#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/wave/"&gt;Wave&lt;/a&gt;:&lt;/span&gt;
Fixed bugs:
&lt;ul&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/24"&gt;#24&lt;/a&gt;: Line numbers wrong after conditional section
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/160"&gt;#160&lt;/a&gt;: one test fails with error C2660 and error C2440 under
msvc /permissive- mode
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/161"&gt;#161&lt;/a&gt;: BOOST_WAVE_THROW_NAME_CTX does not result in a context
callback and always throws
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/wave/issues/162"&gt;#162&lt;/a&gt;: When Boost headers are included in the preprocessed
translation unit, Wave fails in boost/integer.hpp(99)
&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_80_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_9_2"&gt;B2
version 4.9.2&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_80_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;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, 13.0.0, 14.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++11: 3.4, 11.0.0, 13.0.0, 14.0.0
&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, 13.0.0,
14.0.0
&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,
13.0.0, 14.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
Clang, C++20: 11.0.0, 12.0.0, 13.0.0, 14.0.0
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC: 4.6.3, 11, 12
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++11: 4.7.3, 4.8.5, 11, 12
&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, 12
&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, 12
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
GCC, C++20: 8.0.1, 9.1.0, 10, 11, 12
&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, 14.3
&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_80_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 1.79.0</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/923"&gt;PR#923&lt;/a&gt; Added algorithm closest_points for cartesian
point/geometry.
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;
&lt;div&gt;
&lt;a href="https://github.com/boostorg/geometry/pull/939"&gt;PR#939&lt;/a&gt; Added algorithm closest_points for other coordinate
systems and geometry combinations excl. boxes.
&lt;/div&gt;
&lt;/li&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;
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