>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp39059648"></a><h2>Description</h2>
<p><span class="bold"><strong>Remark</strong></span>: Automatically detects if T has a nested allocator_type that is convertible from Alloc. Meets the BinaryTypeTrait requirements ([meta.rqmts] 20.4.1). A program may specialize this type to derive from true_type for a T of user-defined type if T does not have a nested allocator_type but is nonetheless constructible