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libstdc++: Document removal of implicit allocator rebinding extensions

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Traditionally libstdc++ allowed containers and strings to be
instantiated with allocator's that have the wrong value type, implicitly
rebinding the allocator to the container's value type. Since C++20 that
has been explicitly ill-formed, so the extension is no longer supported
in strict modes (e.g. -std=c++17) and in C++20 and later.

libstdc++-v3/ChangeLog:

	* doc/xml/manual/evolution.xml: Document removal of implicit
	allocator rebinding extensions in strict mode and for C++20.
	* doc/html/*: Regenerate.
This commit is contained in:
Jonathan Wakely 2023-05-15 21:41:56 +01:00
parent dec7aaabe9
commit 8cbaf679a3
2 changed files with 32 additions and 0 deletions
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13
libstdc++-v3/doc/html/manual/api.html
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@ -370,6 +370,11 @@ Calling a <code class="code">std::bind</code> result as volatile was deprecated
For the non-default <code class="option">--enable-symvers=gnu-versioned-namespace</code>
configuration, the shared library SONAME has been changed to
<code class="filename">libstdc++.so.8</code>.
</p><p>
The extension allowing containers to be instantiated with an allocator
that doesn't match the container's value type is no longer allowed in
strict (<code class="option">-std=c++NN</code>) modes, only in
<code class="option">-std=gnu++NN</code> modes.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_91"></a><code class="constant">9</code></h3></div></div></div><p>
C++17 header
<code class="filename">&lt;memory_resource&gt;</code>
@ -425,6 +430,10 @@ Calling a <code class="code">std::bind</code> result as volatile was deprecated
and
<code class="filename">&lt;stop_token&gt;</code>
added.
</p><p>
The extension allowing containers to be instantiated with an allocator
that doesn't match the container's value type is no longer allowed in
C++20 mode, even in non-strict <code class="option">-std=gnu++20</code> mode.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_111"></a><code class="constant">11</code></h3></div></div></div><p>
The <code class="option">--enable-cheaders=c_std</code> configuration
was deprecated.
@ -479,4 +488,8 @@ Tunables <span style="color: red">&lt;variable&gt;glibcxx.eh_pool.obj_count&lt;/
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_141"></a><code class="constant">14</code></h3></div></div></div><p>
Deprecate the non-standard overload that allows <code class="code">std::setfill</code>
to be used with <code class="code">std::basic_istream</code>.
</p><p>
The extension allowing <code class="code">std::basic_string</code> to be instantiated
with an allocator that doesn't match the string's character type is no
longer allowed in C++20 mode.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="abi.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="backwards.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ABI Policy and Guidelines </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Backwards Compatibility</td></tr></table></div></body></html>

19
libstdc++-v3/doc/xml/manual/evolution.xml
View file

@ -915,6 +915,13 @@ Calling a <code>std::bind</code> result as volatile was deprecated for C++17.
<filename>libstdc++.so.8</filename>.
</para>
<para>
The extension allowing containers to be instantiated with an allocator
that doesn't match the container's value type is no longer allowed in
strict (<option>-std=c++NN</option>) modes, only in
<option>-std=gnu++NN</option> modes.
</para>
</section>
<section xml:id="api.rel_91"><info><title><constant>9</constant></title></info>
@ -998,6 +1005,12 @@ Calling a <code>std::bind</code> result as volatile was deprecated for C++17.
added.
</para>
<para>
The extension allowing containers to be instantiated with an allocator
that doesn't match the container's value type is no longer allowed in
C++20 mode, even in non-strict <option>-std=gnu++20</option> mode.
</para>
</section>
<section xml:id="api.rel_111"><info><title><constant>11</constant></title></info>
@ -1096,6 +1109,12 @@ Deprecate the non-standard overload that allows <code>std::setfill</code>
to be used with <code>std::basic_istream</code>.
</para>
<para>
The extension allowing <code>std::basic_string</code> to be instantiated
with an allocator that doesn't match the string's character type is no
longer allowed in C++20 mode.
</para>
</section>
</section>