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Update docs for C++23 macros.

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doc/html/boost_config/acknowledgements.html
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@ -7,6 +7,7 @@
<link rel="home" href="../index.html" title="Boost.Config">
<link rel="up" href="../index.html" title="Boost.Config">
<link rel="prev" href="rationale.html" title="Rationale">
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<table cellpadding="2" width="100%"><tr>
@ -45,15 +46,12 @@
configuration.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
</div>
<hr>
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@ -8,6 +8,7 @@
<link rel="up" href="../index.html" title="Boost.Config">
<link rel="prev" href="../index.html" title="Boost.Config">
<link rel="next" href="build_config.html" title="Build Time Configuration">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
@ -47,6 +48,8 @@
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_c__23_features_not_supported">Macros
that describe C++23 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
@ -501,7 +504,7 @@
The compiler fails to compile a nested class that has a dependent
base class:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">foo</span> <span class="special">:</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">bar</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">U</span> <span class="special">{};</span>
@ -526,7 +529,7 @@
<p>
Template value parameters cannot have a dependent type, for example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">::</span><span class="identifier">type</span> <span class="identifier">value</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">::</span><span class="identifier">type</span> <span class="identifier">value</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">X</span> <span class="special">{</span> <span class="special">...</span> <span class="special">};</span>
</pre>
<p>
@ -589,7 +592,7 @@
The compiler does not perform function template ordering or its
function template ordering is incorrect.
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// #1</span>
<pre class="table-programlisting"><span class="comment">// #1</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">T</span><span class="special">);</span>
<span class="comment">// #2</span>
@ -1514,7 +1517,7 @@
The compiler does not allow a void function to return the result
of calling another void function.
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">void</span> <span class="identifier">f</span><span class="special">()</span> <span class="special">{}</span>
<pre class="table-programlisting"><span class="keyword">void</span> <span class="identifier">f</span><span class="special">()</span> <span class="special">{}</span>
<span class="keyword">void</span> <span class="identifier">g</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">f</span><span class="special">();</span> <span class="special">}</span>
</pre>
<p>
@ -3521,7 +3524,7 @@
a compile-time integer constant. The macro can be used to specify
alignment of types and data:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">BOOST_ALIGNMENT</span><span class="special">(</span><span class="number">16</span><span class="special">)</span> <span class="identifier">my_data</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">BOOST_ALIGNMENT</span><span class="special">(</span><span class="number">16</span><span class="special">)</span> <span class="identifier">my_data</span>
<span class="special">{</span>
<span class="keyword">char</span> <span class="identifier">c</span><span class="special">[</span><span class="number">16</span><span class="special">];</span>
<span class="special">};</span>
@ -3543,12 +3546,12 @@
This macro expands to nothing on those compilers, and <code class="computeroutput"><span class="keyword">constexpr</span></code> elsewhere. For example,
when defining a constexpr function or constructor replace:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">constexpr</span> <span class="identifier">tuple</span><span class="special">();</span>
<pre class="table-programlisting"><span class="keyword">constexpr</span> <span class="identifier">tuple</span><span class="special">();</span>
</pre>
<p>
with:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">tuple</span><span class="special">();</span>
<pre class="table-programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">tuple</span><span class="special">();</span>
</pre>
<p>
</p>
@ -3567,12 +3570,12 @@
on those compilers, and <code class="computeroutput"><span class="keyword">constexpr</span></code>
elsewhere. For example, when defining const expr variables replace:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<pre class="table-programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
with:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">static</span> <span class="identifier">BOOST_CONSTEXPR_OR_CONST</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<pre class="table-programlisting"><span class="keyword">static</span> <span class="identifier">BOOST_CONSTEXPR_OR_CONST</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
</p>
@ -3604,12 +3607,12 @@
<span class="identifier">BOOST_CONSTEXPR_OR_CONST</span></code>.
For example, when defining const expr variables replace:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<pre class="table-programlisting"><span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
with:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_STATIC_CONSTEXPR</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<pre class="table-programlisting"><span class="identifier">BOOST_STATIC_CONSTEXPR</span> <span class="identifier">UIntType</span> <span class="identifier">xor_mask</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
</p>
@ -3629,7 +3632,7 @@
an inline function definition with the <code class="computeroutput"><span class="identifier">body</span></code>
implementation. For example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<span class="special">{</span>
<span class="identifier">BOOST_DEFAULTED_FUNCTION</span><span class="special">(</span><span class="identifier">my_struct</span><span class="special">(),</span> <span class="special">{})</span>
<span class="special">};</span>
@ -3637,7 +3640,7 @@
<p>
is equivalent to:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<span class="special">{</span>
<span class="identifier">my_struct</span><span class="special">()</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
<span class="special">};</span>
@ -3645,7 +3648,7 @@
<p>
or:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">my_struct</span>
<span class="special">{</span>
<span class="identifier">my_struct</span><span class="special">()</span> <span class="special">{}</span>
<span class="special">};</span>
@ -3669,7 +3672,7 @@
Since the macro may change the access mode, it is recommended to
use this macro at the end of the class definition. For example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<span class="special">{</span>
<span class="identifier">BOOST_DELETED_FUNCTION</span><span class="special">(</span><span class="identifier">noncopyable</span><span class="special">(</span><span class="identifier">noncopyable</span> <span class="keyword">const</span><span class="special">&amp;))</span>
<span class="identifier">BOOST_DELETED_FUNCTION</span><span class="special">(</span><span class="identifier">noncopyable</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span><span class="identifier">noncopyable</span> <span class="keyword">const</span><span class="special">&amp;))</span>
@ -3678,7 +3681,7 @@
<p>
is equivalent to:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<span class="special">{</span>
<span class="identifier">noncopyable</span><span class="special">(</span><span class="identifier">noncopyable</span> <span class="keyword">const</span><span class="special">&amp;)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
<span class="identifier">noncopyable</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=</span> <span class="special">(</span><span class="identifier">noncopyable</span> <span class="keyword">const</span><span class="special">&amp;)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
@ -3687,7 +3690,7 @@
<p>
or:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">noncopyable</span>
<span class="special">{</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="identifier">noncopyable</span><span class="special">(</span><span class="identifier">noncopyable</span> <span class="keyword">const</span><span class="special">&amp;);</span>
@ -3702,7 +3705,7 @@
<td>
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_NOEXCEPT</span>
<pre class="table-programlisting"><span class="identifier">BOOST_NOEXCEPT</span>
<span class="identifier">BOOST_NOEXCEPT_OR_NOTHROW</span>
<span class="identifier">BOOST_NOEXCEPT_IF</span><span class="special">(</span><span class="identifier">Predicate</span><span class="special">)</span>
<span class="identifier">BOOST_NOEXCEPT_EXPR</span><span class="special">(</span><span class="identifier">Expression</span><span class="special">)</span>
@ -3719,7 +3722,7 @@
<div class="blockquote"><blockquote class="blockquote">
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT</span>
<pre class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_OR_NOTHROW</span> <span class="keyword">throw</span><span class="special">()</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_IF</span><span class="special">(</span><span class="identifier">Predicate</span><span class="special">)</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_EXPR</span><span class="special">(</span><span class="identifier">Expression</span><span class="special">)</span> <span class="keyword">false</span>
@ -3735,7 +3738,7 @@
<div class="blockquote"><blockquote class="blockquote">
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT</span> <span class="keyword">noexcept</span>
<pre class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT</span> <span class="keyword">noexcept</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_OR_NOTHROW</span> <span class="keyword">noexcept</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_IF</span><span class="special">(</span><span class="identifier">Predicate</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">((</span><span class="identifier">Predicate</span><span class="special">))</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_NOEXCEPT_EXPR</span><span class="special">(</span><span class="identifier">Expression</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">((</span><span class="identifier">Expression</span><span class="special">))</span>
@ -3835,7 +3838,7 @@
<div class="blockquote"><blockquote class="blockquote">
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">Foo</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">Foo</span>
<span class="special">{</span>
<span class="keyword">int</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">y</span> <span class="special">=</span> <span class="number">42</span><span class="special">;</span>
<span class="special">};</span>
@ -4508,6 +4511,144 @@
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.boost_macro_reference.macros_that_describe_c__23_features_not_supported"></a><a class="link" href="boost_macro_reference.html#boost_config.boost_macro_reference.macros_that_describe_c__23_features_not_supported" title="Macros that describe C++23 features not supported">Macros
that describe C++23 features not supported</a>
</h3></div></div></div>
<p>
The following macros describe features in the 2023 ISO C++ standard, formerly
known as C++2b, 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_CXX23_HDR_EXPECTED</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">expected</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_FLAT_MAP</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">flat_map</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_FLAT_SET</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">flat_set</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_GENERATOR</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">generator</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_MDSPAN</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">mdspan</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_PRINT</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">print</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_SPANSTREAM</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">spanstream</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_STACKTRACE</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">stacktrace</span><span class="special">&gt;</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">BOOST_NO_CXX23_HDR_STDFLOAT</span></code>
</p>
</td>
<td>
<p>
The compiler does not support the header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">stdfloat</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>
@ -4656,12 +4797,12 @@
that is not otherwise described by one of the other Boost.Config
macros. To use the macro you must first
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">config</span><span class="special">/</span><span class="identifier">workaround</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">config</span><span class="special">/</span><span class="identifier">workaround</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
usage is then:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#if</span> <span class="identifier">BOOST_WORKAROUND</span><span class="special">(</span><span class="identifier">MACRONAME</span><span class="special">,</span> <span class="identifier">CONDITION</span><span class="special">)</span>
<pre class="table-programlisting"><span class="preprocessor">#if</span> <span class="identifier">BOOST_WORKAROUND</span><span class="special">(</span><span class="identifier">MACRONAME</span><span class="special">,</span> <span class="identifier">CONDITION</span><span class="special">)</span>
<span class="comment">// workaround code goes here...</span>
<span class="preprocessor">#else</span>
<span class="comment">// Standard conforming code goes here...</span>
@ -4704,12 +4845,12 @@
in which case one can prevent the function being expanded as a
macro using:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">someclass</span><span class="special">.</span><span class="identifier">min</span> <span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">);</span>
<pre class="table-programlisting"><span class="identifier">someclass</span><span class="special">.</span><span class="identifier">min</span> <span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">);</span>
</pre>
<p>
The following also works in most, but not all, contexts:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">(</span><span class="identifier">someclass</span><span class="special">.</span><span class="identifier">max</span><span class="special">)(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">);</span>
<pre class="table-programlisting"><span class="special">(</span><span class="identifier">someclass</span><span class="special">.</span><span class="identifier">max</span><span class="special">)(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">);</span>
</pre>
<p>
</p>
@ -4804,14 +4945,14 @@
gives us a convenient way to declare such constants. For example
instead of:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">foo</span><span class="special">{</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">foo</span><span class="special">{</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">value</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
use:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">foo</span><span class="special">{</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">foo</span><span class="special">{</span>
<span class="identifier">BOOST_STATIC_CONSTANT</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">value</span> <span class="special">=</span> <span class="number">2</span><span class="special">);</span>
<span class="special">};</span>
</pre>
@ -4843,7 +4984,7 @@
The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
between switch labels:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">switch</span> <span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="special">{</span>
<pre class="table-programlisting"><span class="keyword">switch</span> <span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="special">{</span>
<span class="keyword">case</span> <span class="number">40</span><span class="special">:</span>
<span class="keyword">case</span> <span class="number">41</span><span class="special">:</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">truth_is_out_there</span><span class="special">)</span> <span class="special">{</span>
@ -4901,7 +5042,7 @@
instantiations if some of the template parameters don't appear
in the function parameter list. For instance:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">ostream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">typeinfo</span><span class="special">&gt;</span>
@ -4925,7 +5066,7 @@
the problem without effects on the calling syntax. For instance,
in the case above write:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">BOOST_EXPLICIT_TEMPLATE_NON_TYPE</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">n</span><span class="special">))</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
@ -5052,7 +5193,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">void</span> <span class="identifier">perform_computation</span><span class="special">(</span> <span class="keyword">float</span><span class="special">*</span> <span class="identifier">BOOST_RESTRICT</span> <span class="identifier">in</span><span class="special">,</span> <span class="keyword">float</span><span class="special">*</span> <span class="identifier">BOOST_RESTRICT</span> <span class="identifier">out</span> <span class="special">)</span>
<pre class="table-programlisting"><span class="keyword">void</span> <span class="identifier">perform_computation</span><span class="special">(</span> <span class="keyword">float</span><span class="special">*</span> <span class="identifier">BOOST_RESTRICT</span> <span class="identifier">in</span><span class="special">,</span> <span class="keyword">float</span><span class="special">*</span> <span class="identifier">BOOST_RESTRICT</span> <span class="identifier">out</span> <span class="special">)</span>
<span class="special">{</span>
<span class="special">*</span><span class="identifier">out</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">in</span> <span class="special">*</span> <span class="number">0.5f</span><span class="special">;</span>
<span class="special">}</span>
@ -5079,7 +5220,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<pre class="table-programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">BOOST_FORCEINLINE</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">t</span><span class="special">;</span>
@ -5111,7 +5252,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_NOINLINE</span> <span class="keyword">void</span> <span class="identifier">handle_error</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">descr</span><span class="special">)</span>
<pre class="table-programlisting"><span class="identifier">BOOST_NOINLINE</span> <span class="keyword">void</span> <span class="identifier">handle_error</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">descr</span><span class="special">)</span>
<span class="special">{</span>
<span class="comment">// ...</span>
<span class="special">}</span>
@ -5142,7 +5283,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_NORETURN</span> <span class="keyword">void</span> <span class="identifier">on_error_occurred</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">descr</span><span class="special">)</span>
<pre class="table-programlisting"><span class="identifier">BOOST_NORETURN</span> <span class="keyword">void</span> <span class="identifier">on_error_occurred</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">descr</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">throw</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span><span class="special">(</span><span class="identifier">descr</span><span class="special">);</span>
<span class="special">}</span>
@ -5181,7 +5322,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">BOOST_UNLIKELY</span><span class="special">(</span><span class="identifier">ptr</span> <span class="special">==</span> <span class="identifier">NULL</span><span class="special">))</span>
<pre class="table-programlisting"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">BOOST_UNLIKELY</span><span class="special">(</span><span class="identifier">ptr</span> <span class="special">==</span> <span class="identifier">NULL</span><span class="special">))</span>
<span class="identifier">handle_error</span><span class="special">(</span><span class="string">"ptr is NULL"</span><span class="special">);</span>
</pre>
<p>
@ -5250,7 +5391,7 @@
<p>
Usage example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">BOOST_MAY_ALIAS</span> <span class="identifier">aliasing_struct</span><span class="special">;</span>
<pre class="table-programlisting"><span class="keyword">struct</span> <span class="identifier">BOOST_MAY_ALIAS</span> <span class="identifier">aliasing_struct</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">BOOST_MAY_ALIAS</span> <span class="identifier">aliasing_uint</span><span class="special">;</span>
</pre>
<p>
@ -5275,7 +5416,7 @@
<p>
Example:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">BOOST_DEPRECATED</span><span class="special">(</span><span class="string">"Use bar() instead."</span><span class="special">)</span>
<pre class="table-programlisting"><span class="identifier">BOOST_DEPRECATED</span><span class="special">(</span><span class="string">"Use bar() instead."</span><span class="special">)</span>
<span class="keyword">void</span> <span class="identifier">foo</span><span class="special">();</span>
<span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">&gt;</span>
@ -6926,7 +7067,7 @@
boundaries. For example, a header-only exception class might
look like this:
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="keyword">class</span> <span class="identifier">BOOST_SYMBOL_VISIBLE</span> <span class="identifier">my_exception</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span> <span class="special">{</span> <span class="special">...</span> <span class="special">};</span>
<pre class="table-programlisting"><span class="keyword">class</span> <span class="identifier">BOOST_SYMBOL_VISIBLE</span> <span class="identifier">my_exception</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span> <span class="special">{</span> <span class="special">...</span> <span class="special">};</span>
</pre>
<p>
Without BOOST_SYMBOL_VISIBLE, it would be impossible to catch
@ -7172,15 +7313,12 @@
</div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<link rel="up" href="../index.html" title="Boost.Config">
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@ -158,15 +159,12 @@
for you to write the test cases yourself.
</p>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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@ -8,6 +8,7 @@
<link rel="up" href="../index.html" title="Boost.Config">
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@ -284,15 +285,12 @@
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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@ -8,6 +8,7 @@
<link rel="up" href="../index.html" title="Boost.Config">
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@ -360,15 +361,12 @@
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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@ -8,6 +8,7 @@
<link rel="up" href="../index.html" title="Boost.Config">
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@ -107,15 +108,12 @@
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
<div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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@ -991,10 +994,7 @@
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20
doc/macro_reference.qbk
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@ -1073,6 +1073,26 @@ that are not yet supported by a particular compiler or library.
[endsect]
[section Macros that describe C++23 features not supported]
The following macros describe features in the 2023 ISO C++ standard, formerly known as C++2b,
that are not yet supported by a particular compiler or library.
[table
[[Macro ][Description ]]
[[`BOOST_NO_CXX23_HDR_EXPECTED`][The compiler does not support the header `<expected>`.]]
[[`BOOST_NO_CXX23_HDR_FLAT_MAP`][The compiler does not support the header `<flat_map>`.]]
[[`BOOST_NO_CXX23_HDR_FLAT_SET`][The compiler does not support the header `<flat_set>`.]]
[[`BOOST_NO_CXX23_HDR_GENERATOR`][The compiler does not support the header `<generator>`.]]
[[`BOOST_NO_CXX23_HDR_MDSPAN`][The compiler does not support the header `<mdspan>`.]]
[[`BOOST_NO_CXX23_HDR_PRINT`][The compiler does not support the header `<print>`.]]
[[`BOOST_NO_CXX23_HDR_SPANSTREAM`][The compiler does not support the header `<spanstream>`.]]
[[`BOOST_NO_CXX23_HDR_STACKTRACE`][The compiler does not support the header `<stacktrace>`.]]
[[`BOOST_NO_CXX23_HDR_STDFLOAT`][The compiler does not support the header `<stdfloat>`.]]
]
[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.

41
include/boost/config/assert_cxx23.hpp Normal file
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@ -0,0 +1,41 @@
// This file was automatically generated on Sat Sep 9 19:03:28 2023
// by libs/config/tools/generate.cpp
// Copyright John Maddock 2002-21.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/config for the most recent version.//
// Revision $Id$
//
#include <boost/config.hpp>
#include <boost/config/assert_cxx20.hpp>
#ifdef BOOST_NO_CXX23_HDR_EXPECTED
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_EXPECTED."
#endif
#ifdef BOOST_NO_CXX23_HDR_FLAT_MAP
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_FLAT_MAP."
#endif
#ifdef BOOST_NO_CXX23_HDR_FLAT_SET
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_FLAT_SET."
#endif
#ifdef BOOST_NO_CXX23_HDR_GENERATOR
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_GENERATOR."
#endif
#ifdef BOOST_NO_CXX23_HDR_MDSPAN
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_MDSPAN."
#endif
#ifdef BOOST_NO_CXX23_HDR_PRINT
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_PRINT."
#endif
#ifdef BOOST_NO_CXX23_HDR_SPANSTREAM
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_SPANSTREAM."
#endif
#ifdef BOOST_NO_CXX23_HDR_STACKTRACE
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_STACKTRACE."
#endif
#ifdef BOOST_NO_CXX23_HDR_STDFLOAT
# error "Your compiler appears not to be fully C++23 compliant. Detected via defect macro BOOST_NO_CXX23_HDR_STDFLOAT."
#endif