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  26 <div class="refentry">
  27 <a name="boost.container.allocator_traits"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Struct template allocator_traits</span></h2>
  30 <p>boost::container::allocator_traits</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_container_header_reference.html#header.boost.container.allocator_traits_hpp" title="Header &lt;boost/container/allocator_traits.hpp&gt;">boost/container/allocator_traits.hpp</a>&gt;
  34
  35 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Allocator<span class="special">&gt;</span>
  36 <span class="keyword">struct</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a> <span class="special">{</span>
  37   <span class="comment">// <a class="link" href="allocator_traits.html#boost.container.allocator_traitstypes">types</a></span>
  38   <span class="keyword">typedef</span> <span class="identifier">Allocator</span>                             <a name="boost.container.allocator_traits.allocator_type"></a><span class="identifier">allocator_type</span><span class="special">;</span>
  39   <span class="keyword">typedef</span> <span class="identifier">allocator_type</span><span class="special">::</span><span class="identifier">value_type</span>            <a name="boost.container.allocator_traits.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
  40   <span class="keyword">typedef</span> <span class="identifier">unspecified</span>                           <a class="link" href="allocator_traits.html#boost.container.allocator_traits.pointer"><span class="identifier">pointer</span></a><span class="special">;</span>
  41   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.const_pointer"><span class="identifier">const_pointer</span></a><span class="special">;</span>
  42   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.reference"><span class="identifier">reference</span></a><span class="special">;</span>
  43   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.const_reference"><span class="identifier">const_reference</span></a><span class="special">;</span>
  44   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.void_pointer"><span class="identifier">void_pointer</span></a><span class="special">;</span>
  45   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.const_void_pointer"><span class="identifier">const_void_pointer</span></a><span class="special">;</span>
  46   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.difference_type"><span class="identifier">difference_type</span></a><span class="special">;</span>
  47   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.size_type"><span class="identifier">size_type</span></a><span class="special">;</span>
  48   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagat_idm45666075028848"><span class="identifier">propagate_on_container_copy_assignment</span></a><span class="special">;</span>
  49   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagat_idm45666075026992"><span class="identifier">propagate_on_container_move_assignment</span></a><span class="special">;</span>
  50   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagat_idm45666075025136"><span class="identifier">propagate_on_container_swap</span></a><span class="special">;</span>
  51   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.is_always_equal"><span class="identifier">is_always_equal</span></a><span class="special">;</span>
  52   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.is_partially_propagable"><span class="identifier">is_partially_propagable</span></a><span class="special">;</span>
  53   <span class="keyword">typedef</span> <span class="identifier">see_documentation</span>                     <a class="link" href="allocator_traits.html#boost.container.allocator_traits.rebind_alloc"><span class="identifier">rebind_alloc</span></a><span class="special">;</span>
  54   <span class="keyword">typedef</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a><span class="special">&lt;</span> <span class="identifier">rebind_alloc</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a class="link" href="allocator_traits.html#boost.container.allocator_traits.rebind_traits"><span class="identifier">rebind_traits</span></a><span class="special">;</span>
  55
  56   <span class="comment">// member classes/structs/unions</span>
  57   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
  58   <span class="keyword">struct</span> <a class="link" href="allocator_traits/portable_rebind_alloc.html" title="Struct template portable_rebind_alloc">portable_rebind_alloc</a> <span class="special">{</span>
  59     <span class="comment">// types</span>
  60     <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a class="link" href="allocator_traits/portable_rebind_alloc.html#boost.container.allocator_traits.portable_rebind_alloc.type"><span class="identifier">type</span></a><span class="special">;</span>
  61   <span class="special">}</span><span class="special">;</span>
  62
  63   <span class="comment">// <a class="link" href="allocator_traits.html#idm45666075012272-bb">public static functions</a></span>
  64   <span class="keyword">static</span> <span class="identifier">pointer</span> <a class="link" href="allocator_traits.html#idm45666075011712-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span>
  65   <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idm45666075007792-bb"><span class="identifier">deallocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">pointer</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span>
  66   <span class="keyword">static</span> <span class="identifier">pointer</span> <a class="link" href="allocator_traits.html#idm45666075002496-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">const_void_pointer</span><span class="special">)</span><span class="special">;</span>
  67   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idm45666074997408-bb"><span class="identifier">destroy</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">T</span> <span class="special">*</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  68   <span class="keyword">static</span> <span class="identifier">size_type</span> <a class="link" href="allocator_traits.html#idm45666074991888-bb"><span class="identifier">max_size</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  69   <span class="keyword">static</span> <span class="identifier">Allocator</span> <a class="link" href="allocator_traits.html#idm45666074987888-bb"><span class="identifier">select_on_container_copy_construction</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  70   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span> Args<span class="special">&gt;</span>
  71     <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idm45666074984576-bb"><span class="identifier">construct</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">T</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
  72   <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="allocator_traits.html#idm45666074977440-bb"><span class="identifier">storage_is_unpropagable</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  73   <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="allocator_traits.html#idm45666074972752-bb"><span class="identifier">equal</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  74 <span class="special">}</span><span class="special">;</span></pre></div>
  75 <div class="refsect1">
  76 <a name="id-1.3.10.14.4.3.4"></a><h2>Description</h2>
  77 <p>The class template <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a> supplies a uniform interface to all allocator types. This class is a C++03-compatible implementation of std::allocator_traits </p>
  78 <div class="refsect2">
  79 <a name="id-1.3.10.14.4.3.4.3"></a><h3>
  80 <a name="boost.container.allocator_traitstypes"></a><code class="computeroutput">allocator_traits</code>
  81         public
  82        types</h3>
  83 <div class="orderedlist"><ol class="orderedlist" type="1">
  84 <li class="listitem">
  85 <p>
  86 <span class="keyword">typedef</span> <span class="identifier">unspecified</span> <a name="boost.container.allocator_traits.pointer"></a><span class="identifier">pointer</span><span class="special">;</span></p>
  87 <p>Allocator::pointer if such a type exists; otherwise, value_type* </p>
  88 </li>
  89 <li class="listitem">
  90 <p>
  91 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.const_pointer"></a><span class="identifier">const_pointer</span><span class="special">;</span></p>
  92 <p>Allocator::const_pointer if such a type exists ; otherwise, pointer_traits&lt;pointer&gt;::rebind&lt;const </p>
  93 </li>
  94 <li class="listitem">
  95 <p>
  96 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.reference"></a><span class="identifier">reference</span><span class="special">;</span></p>
  97 <p>Non-standard extension Allocator::reference if such a type exists; otherwise, value_type&amp; </p>
  98 </li>
  99 <li class="listitem">
 100 <p>
 101 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.const_reference"></a><span class="identifier">const_reference</span><span class="special">;</span></p>
 102 <p>Non-standard extension Allocator::const_reference if such a type exists ; otherwise, const value_type&amp; </p>
 103 </li>
 104 <li class="listitem">
 105 <p>
 106 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.void_pointer"></a><span class="identifier">void_pointer</span><span class="special">;</span></p>
 107 <p>Allocator::void_pointer if such a type exists ; otherwise, pointer_traits&lt;pointer&gt;::rebind&lt;void&gt;. </p>
 108 </li>
 109 <li class="listitem">
 110 <p>
 111 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.const_void_pointer"></a><span class="identifier">const_void_pointer</span><span class="special">;</span></p>
 112 <p>Allocator::const_void_pointer if such a type exists ; otherwise, pointer_traits&lt;pointer&gt;::rebind&lt;const </p>
 113 </li>
 114 <li class="listitem">
 115 <p>
 116 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span></p>
 117 <p>Allocator::difference_type if such a type exists ; otherwise, pointer_traits&lt;pointer&gt;::difference_type. </p>
 118 </li>
 119 <li class="listitem">
 120 <p>
 121 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.size_type"></a><span class="identifier">size_type</span><span class="special">;</span></p>
 122 <p>Allocator::size_type if such a type exists ; otherwise, make_unsigned&lt;difference_type&gt;::type </p>
 123 </li>
 124 <li class="listitem">
 125 <p>
 126 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagat_idm45666075028848"></a><span class="identifier">propagate_on_container_copy_assignment</span><span class="special">;</span></p>
 127 <p>Allocator::propagate_on_container_copy_assignment if such a type exists, otherwise a type with an internal constant static boolean member <code class="computeroutput">value</code> == false. </p>
 128 </li>
 129 <li class="listitem">
 130 <p>
 131 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagat_idm45666075026992"></a><span class="identifier">propagate_on_container_move_assignment</span><span class="special">;</span></p>
 132 <p>Allocator::propagate_on_container_move_assignment if such a type exists, otherwise a type with an internal constant static boolean member <code class="computeroutput">value</code> == false. </p>
 133 </li>
 134 <li class="listitem">
 135 <p>
 136 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagat_idm45666075025136"></a><span class="identifier">propagate_on_container_swap</span><span class="special">;</span></p>
 137 <p>Allocator::propagate_on_container_swap if such a type exists, otherwise a type with an internal constant static boolean member <code class="computeroutput">value</code> == false. </p>
 138 </li>
 139 <li class="listitem">
 140 <p>
 141 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.is_always_equal"></a><span class="identifier">is_always_equal</span><span class="special">;</span></p>
 142 <p>Allocator::is_always_equal if such a type exists, otherwise a type with an internal constant static boolean member <code class="computeroutput">value</code> == is_empty&lt;Allocator&gt;::value </p>
 143 </li>
 144 <li class="listitem">
 145 <p>
 146 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.is_partially_propagable"></a><span class="identifier">is_partially_propagable</span><span class="special">;</span></p>
 147 <p>Allocator::is_partially_propagable if such a type exists, otherwise a type with an internal constant static boolean member <code class="computeroutput">value</code> == false <span class="bold"><strong>Note</strong></span>: Non-standard extension used to implement <code class="computeroutput"><a class="link" href="small_vector_allocator.html" title="Class template small_vector_allocator">small_vector_allocator</a></code>. </p>
 148 </li>
 149 <li class="listitem">
 150 <p>
 151 <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.rebind_alloc"></a><span class="identifier">rebind_alloc</span><span class="special">;</span></p>
 152 <p>Defines an allocator: Allocator::rebind&lt;T&gt;::other if such a type exists; otherwise, Allocator&lt;T, Args&gt; if Allocator is a class template instantiation of the form Allocator&lt;U, Args&gt;, where Args is zero or more type arguments ; otherwise, the instantiation of rebind_alloc is ill-formed.</p>
 153 <p>In C++03 compilers <code class="computeroutput">rebind_alloc</code> is a struct derived from an allocator deduced by previously detailed rules. </p>
 154 </li>
 155 <li class="listitem">
 156 <p>
 157 <span class="keyword">typedef</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a><span class="special">&lt;</span> <span class="identifier">rebind_alloc</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.container.allocator_traits.rebind_traits"></a><span class="identifier">rebind_traits</span><span class="special">;</span></p>
 158 <p>In C++03 compilers <code class="computeroutput">rebind_traits</code> is a struct derived from <code class="computeroutput">allocator_traits&lt;OtherAlloc&gt;</code>, where <code class="computeroutput">OtherAlloc</code> is the allocator deduced by rules explained in <code class="computeroutput">rebind_alloc</code>. </p>
 159 </li>
 160 </ol></div>
 161 </div>
 162 <div class="refsect2">
 163 <a name="id-1.3.10.14.4.3.4.4"></a><h3>
 164 <a name="idm45666075012272-bb"></a><code class="computeroutput">allocator_traits</code> public static functions</h3>
 165 <div class="orderedlist"><ol class="orderedlist" type="1">
 166 <li class="listitem">
 167 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">pointer</span> <a name="idm45666075011712-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">)</span><span class="special">;</span></pre>
 168 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.allocate(n)</code> </p>
 169 </li>
 170 <li class="listitem">
 171 <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <a name="idm45666075007792-bb"></a><span class="identifier">deallocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">pointer</span> p<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">)</span><span class="special">;</span></pre>
 172 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.deallocate(p, n)</code></p>
 173 <p><span class="bold"><strong>Throws</strong></span>: Nothing </p>
 174 </li>
 175 <li class="listitem">
 176 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">pointer</span> <a name="idm45666075002496-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">,</span> <span class="identifier">const_void_pointer</span> p<span class="special">)</span><span class="special">;</span></pre>
 177 <p><span class="bold"><strong>Effects</strong></span>: calls <code class="computeroutput">a.allocate(n, p)</code> if that call is well-formed; otherwise, invokes <code class="computeroutput">a.allocate(n)</code> </p>
 178 </li>
 179 <li class="listitem">
 180 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">static</span> <span class="keyword">void</span> <a name="idm45666074997408-bb"></a><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">T</span> <span class="special">*</span> p<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 181 <p><span class="bold"><strong>Effects</strong></span>: calls <code class="computeroutput">a.destroy(p)</code> if that call is well-formed; otherwise, invokes <code class="computeroutput">p-&gt;~T()</code>. </p>
 182 </li>
 183 <li class="listitem">
 184 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">size_type</span> <a name="idm45666074991888-bb"></a><span class="identifier">max_size</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 185 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.max_size()</code> if that expression is well-formed; otherwise, <code class="computeroutput">numeric_limits&lt;size_type&gt;::max()</code>. </p>
 186 </li>
 187 <li class="listitem">
 188 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">Allocator</span> <a name="idm45666074987888-bb"></a><span class="identifier">select_on_container_copy_construction</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="special">;</span></pre>
 189 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.select_on_container_copy_construction()</code> if that expression is well-formed; otherwise, a. </p>
 190 </li>
 191 <li class="listitem">
 192 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span> Args<span class="special">&gt;</span>
 193   <span class="keyword">static</span> <span class="keyword">void</span> <a name="idm45666074984576-bb"></a><span class="identifier">construct</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">T</span> <span class="special">*</span> p<span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span><span class="special">...</span> args<span class="special">)</span><span class="special">;</span></pre>
 194 <p><span class="bold"><strong>Effects</strong></span>: calls <code class="computeroutput">a.construct(p, std::forward&lt;Args&gt;(args)...)</code> if that call is well-formed; otherwise, invokes <code class="computeroutput"><code class="computeroutput">placement new</code> (static_cast&lt;void*&gt;(p)) T(std::forward&lt;Args&gt;(args)...)</code> </p>
 195 </li>
 196 <li class="listitem">
 197 <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idm45666074977440-bb"></a><span class="identifier">storage_is_unpropagable</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="identifier">pointer</span> p<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 198 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.storage_is_unpropagable(p)</code> if is_partially_propagable::value is true; otherwise, <code class="computeroutput">false</code>. </p>
 199 </li>
 200 <li class="listitem">
 201 <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idm45666074972752-bb"></a><span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span> a<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&amp;</span> b<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 202 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">true</code> if <code class="computeroutput">is_always_equal::value == true</code>, otherwise, <code class="computeroutput">a == b</code>. </p>
 203 </li>
 204 </ol></div>
 205 </div>
 206 </div>
 207 </div>
 208 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 209 <td align="left"></td>
 210 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2018 Ion Gaztanaga<p>
 211         Distributed under the Boost Software License, Version 1.0. (See accompanying
 212         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>)
 213       </p>
 214 </div></td>
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