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Document C++20 macros.

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doc/html/boost_config/boost_macro_reference.html
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@ -45,6 +45,8 @@
that describe C++17 features not supported</a></span></dt>
<dt><span class="section"><a href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_allow_use_of_c__17_features_with_c__14_or_earlier_compilers">Macros
that allow use of C++17 features with C++14 or earlier compilers</a></span></dt>
<dt><span class="section"><a href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_c__20_features_not_supported">Macros
that describe C++20 features not supported</a></span></dt>
<dt><span class="section"><a href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_features_that_have_been_removed_from_the_standard_">Macros
that describe features that have been removed from the standard.</a></span></dt>
<dt><span class="section"><a href="boost_macro_reference.html#boost_config.boost_macro_reference.boost_helper_macros">Boost
@ -4125,6 +4127,204 @@
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.boost_macro_reference.macros_that_describe_c__20_features_not_supported"></a><a class="link" href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_c__20_features_not_supported" title="Macros that describe C++20 features not supported">Macros
that describe C++20 features not supported</a>
</h3></div></div></div>
<p>
The following macros describe features in the 2020 ISO C++ standard, formerly
known as C++2a, that are not yet supported by a particular compiler or library.
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Macro
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_BARRIER</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">barrier</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_FORMAT</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">format</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_SOURCE_LOCATION</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">format</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_BIT</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">bit</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_LATCH</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">latch</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_SPAN</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">span</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_COMPARE</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">compare</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_NUMBERS</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">numbers</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_STOP_TOKEN</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">stop_token</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_CONCEPTS</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">concepts</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_RANGES</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">range</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_SYNCSTREAM</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">syncstream</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_COROUTINE</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">coroutine</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX20_HDR_SEMAPHORE</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">semaphore</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.boost_macro_reference.macros_that_describe_features_that_have_been_removed_from_the_standard_"></a><a class="link" href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_features_that_have_been_removed_from_the_standard_" title="Macros that describe features that have been removed from the standard.">Macros
that describe features that have been removed from the standard.</a>
</h3></div></div></div>
@ -4205,6 +4405,19 @@
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX11_ATOMIC_SMART_PTR</span></code>
</p>
</td>
<td>
<p>
The standard library no longer supports atomic overloads for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">shared_ptr</span></code>: use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">atomic</span><span class="special">&lt;</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&gt;</span></code>
instead.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>

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@ -76,6 +76,8 @@
that describe C++17 features not supported</a></span></dt>
<dt><span class="section"><a href="boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_allow_use_of_c__17_features_with_c__14_or_earlier_compilers">Macros
that allow use of C++17 features with C++14 or earlier compilers</a></span></dt>
<dt><span class="section"><a href="boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_c__20_features_not_supported">Macros
that describe C++20 features not supported</a></span></dt>
<dt><span class="section"><a href="boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_features_that_have_been_removed_from_the_standard_">Macros
that describe features that have been removed from the standard.</a></span></dt>
<dt><span class="section"><a href="boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.boost_helper_macros">Boost
@ -990,7 +992,7 @@
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"><p><small>Last revised: December 18, 2020 at 10:47:00 GMT</small></p></td>
<td align="left"><p><small>Last revised: March 05, 2021 at 17:51:35 GMT</small></p></td>
<td align="right"><div class="copyright-footer"></div></td>
</tr></table>
<hr>

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doc/macro_reference.qbk
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@ -995,6 +995,31 @@ provide compliant C++17 support.
[endsect]
[section Macros that describe C++20 features not supported]
The following macros describe features in the 2020 ISO C++ standard, formerly known as C++2a,
that are not yet supported by a particular compiler or library.
[table
[[Macro ][Description ]]
[[`BOOST_NO_CXX20_HDR_BARRIER`][The compiler does not support the header `<barrier>`.]]
[[`BOOST_NO_CXX20_HDR_FORMAT`][The compiler does not support the header `<format>`.]]
[[`BOOST_NO_CXX20_HDR_SOURCE_LOCATION`][The compiler does not support the header `<format>`.]]
[[`BOOST_NO_CXX20_HDR_BIT`][The compiler does not support the header `<bit>`.]]
[[`BOOST_NO_CXX20_HDR_LATCH`][The compiler does not support the header `<latch>`.]]
[[`BOOST_NO_CXX20_HDR_SPAN`][The compiler does not support the header `<span>`.]]
[[`BOOST_NO_CXX20_HDR_COMPARE`][The compiler does not support the header `<compare>`.]]
[[`BOOST_NO_CXX20_HDR_NUMBERS`][The compiler does not support the header `<numbers>`.]]
[[`BOOST_NO_CXX20_HDR_STOP_TOKEN`][The compiler does not support the header `<stop_token>`.]]
[[`BOOST_NO_CXX20_HDR_CONCEPTS`][The compiler does not support the header `<concepts>`.]]
[[`BOOST_NO_CXX20_HDR_RANGES`][The compiler does not support the header `<range>`.]]
[[`BOOST_NO_CXX20_HDR_SYNCSTREAM`][The compiler does not support the header `<syncstream>`.]]
[[`BOOST_NO_CXX20_HDR_COROUTINE`][The compiler does not support the header `<coroutine>`.]]
[[`BOOST_NO_CXX20_HDR_SEMAPHORE`][The compiler does not support the header `<semaphore>`.]]
]
[endsect]
[section Macros that describe features that have been removed from the standard.]
The following macros describe features which were required by one version of the standard, but have been removed by later versions.