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libstdc++: Document removal of implicit allocator rebinding extensions

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Traditionally libstdc++ allowed containers 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.

(cherry picked from commit 8cbaf679a3c1875c5475bd1cb0fb86fb9d03b2d4)
This commit is contained in:
Jonathan Wakely 2023-05-15 21:41:56 +01:00
parent 81059051f8
commit d50255d8d2
2 changed files with 22 additions and 0 deletions
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9
libstdc++-v3/doc/html/manual/api.html
View File

@ -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.

13
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>