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<h2><span class="refentrytitle">Struct template uses_allocator</span></h2>
<p>boost::container::uses_allocator</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_container_header_reference.html#header.boost.container.uses_allocator_hpp" title="Header <boost/container/uses_allocator.hpp>">boost/container/uses_allocator.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> Allocator<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="uses_allocator.html" title="Struct template uses_allocator">uses_allocator</a> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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<a name="idm45555384570688"></a><h2>Description</h2>
<p><span class="bold"><strong>Remark</strong></span>: Automatically detects whether T has a nested allocator_type that is convertible from Allocator. Meets the BinaryTypeTrait requirements ([meta.rqmts] 20.4.1). A program may specialize this type to define uses_allocator<X>::value as true for a T of user-defined type if T does not have a nested allocator_type but is nonetheless constructible using the specified Allocator where either: the first argument of a constructor has type allocator_arg_t and the second argument has type Alloc or the last argument of a constructor has type Alloc.</p>
<p><span class="bold"><strong>Result</strong></span>: uses_allocator<T, Allocator>::value== true if a type T::allocator_type exists and either is_convertible<Alloc, T::allocator_type>::value != false or T::allocator_type is an alias <code class="computeroutput"><a class="link" href="erased_type.html" title="Struct erased_type">erased_type</a></code>. False otherwise. </p>
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<td align="right"><div class="copyright-footer">Copyright © 2009-2015 Ion Gaztanaga<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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