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187 lines
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<title>associated_allocator</title>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.associated_allocator"></a><a class="link" href="associated_allocator.html" title="associated_allocator">associated_allocator</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.associated_allocator"></a>
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</p>
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<p>
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Traits type used to obtain the allocator associated with an object.
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special"><</span><span class="keyword">void</span><span class="special">>></span>
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<span class="keyword">struct</span> <span class="identifier">associated_allocator</span>
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</pre>
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<h5>
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<a name="asio.reference.associated_allocator.h0"></a>
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<span><a name="asio.reference.associated_allocator.types"></a></span><a class="link" href="associated_allocator.html#asio.reference.associated_allocator.types">Types</a>
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</h5>
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<div class="informaltable"><table class="table">
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<thead><tr>
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Name
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<p>
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Description
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</p>
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</tr></thead>
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<a class="link" href="associated_allocator/type.html" title="associated_allocator::type"><span class="bold"><strong>type</strong></span></a>
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<p>
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If T has a nested type allocator_type, T::allocator_type. Otherwise
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Allocator.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<h5>
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<a name="asio.reference.associated_allocator.h1"></a>
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<span><a name="asio.reference.associated_allocator.member_functions"></a></span><a class="link" href="associated_allocator.html#asio.reference.associated_allocator.member_functions">Member Functions</a>
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</h5>
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<div class="informaltable"><table class="table">
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<thead><tr>
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Name
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Description
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<a class="link" href="associated_allocator/decltype.html" title="associated_allocator::decltype"><span class="bold"><strong>decltype</strong></span></a> <span class="silver">[static]</span>
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<p>
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If T has a nested type allocator_type, returns t.get_allocator().
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Otherwise returns type(). <br> <span class="silver"> —</span><br> If T has a nested type
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allocator_type, returns t.get_allocator(). Otherwise returns a.
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</p>
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</tr></tbody>
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</table></div>
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<h5>
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<a name="asio.reference.associated_allocator.h2"></a>
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<span><a name="asio.reference.associated_allocator.data_members"></a></span><a class="link" href="associated_allocator.html#asio.reference.associated_allocator.data_members">Data
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Members</a>
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</h5>
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<div class="informaltable"><table class="table">
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Name
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Description
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<a class="link" href="associated_allocator/noexcept.html" title="associated_allocator::noexcept"><span class="bold"><strong>noexcept</strong></span></a>
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</p>
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</td>
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<td>
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</td>
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</tr></tbody>
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</table></div>
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<p>
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A program may specialise this traits type if the <code class="computeroutput"><span class="identifier">T</span></code>
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template parameter in the specialisation is a user-defined type. The template
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parameter <code class="computeroutput"><span class="identifier">Allocator</span></code> shall
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be a type meeting the Allocator requirements.
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</p>
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<p>
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Specialisations shall meet the following requirements, where <code class="computeroutput"><span class="identifier">t</span></code> is a const reference to an object of
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type <code class="computeroutput"><span class="identifier">T</span></code>, and <code class="computeroutput"><span class="identifier">a</span></code> is an object of type <code class="computeroutput"><span class="identifier">Allocator</span></code>.
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Provide a nested typedef <code class="computeroutput"><span class="identifier">type</span></code>
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that identifies a type meeting the Allocator requirements.
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</li>
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<li class="listitem">
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Provide a noexcept static member function named <code class="computeroutput"><span class="identifier">get</span></code>,
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callable as <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">t</span><span class="special">)</span></code>
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and with return type <code class="computeroutput"><span class="identifier">type</span></code>
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or a (possibly const) reference to <code class="computeroutput"><span class="identifier">type</span></code>.
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</li>
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<li class="listitem">
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Provide a noexcept static member function named <code class="computeroutput"><span class="identifier">get</span></code>,
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callable as <code class="computeroutput"><span class="identifier">get</span><span class="special">(</span><span class="identifier">t</span><span class="special">,</span><span class="identifier">a</span><span class="special">)</span></code>
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and with return type <code class="computeroutput"><span class="identifier">type</span></code>
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or a (possibly const) reference to <code class="computeroutput"><span class="identifier">type</span></code>.
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</li>
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</ul></div>
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<h5>
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<a name="asio.reference.associated_allocator.h3"></a>
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<span><a name="asio.reference.associated_allocator.requirements"></a></span><a class="link" href="associated_allocator.html#asio.reference.associated_allocator.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/associated_allocator.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div>
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<hr>
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