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Document C++20 macros.

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@ -45,6 +45,8 @@
that describe C++17 features not supported</a></span></dt> 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 <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> 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 <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> 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 <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>
<div class="section"> <div class="section">
<div class="titlepage"><div><div><h3 class="title"> <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 <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> that describe features that have been removed from the standard.</a>
</h3></div></div></div> </h3></div></div></div>
@ -4205,6 +4405,19 @@
</p> </p>
</td> </td>
</tr> </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> </tbody>
</table></div> </table></div>
</div> </div>

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@ -76,6 +76,8 @@
that describe C++17 features not supported</a></span></dt> 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 <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> 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 <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> 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 <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>
</div> </div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <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> <td align="right"><div class="copyright-footer"></div></td>
</tr></table> </tr></table>
<hr> <hr>

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@ -995,6 +995,31 @@ provide compliant C++17 support.
[endsect] [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.] [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. The following macros describe features which were required by one version of the standard, but have been removed by later versions.