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| <a name="boost.container.allocator_traits"></a><div class="titlepage"></div> |
| <div class="refnamediv"> |
| <h2><span class="refentrytitle">Struct template allocator_traits</span></h2> |
| <p>boost::container::allocator_traits</p> |
| </div> |
| <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.allocator_traits_hpp" title="Header <boost/container/allocator_traits.hpp>">boost/container/allocator_traits.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Allocator<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a> <span class="special">{</span> |
| <span class="comment">// <a class="link" href="allocator_traits.html#boost.container.allocator_traitstypes">types</a></span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagate_on_c_idp26403824"><span class="identifier">propagate_on_container_copy_assignment</span></a><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagate_on_c_idp26405680"><span class="identifier">propagate_on_container_move_assignment</span></a><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a class="link" href="allocator_traits.html#boost.container.allocator_traits.propagate_on_c_idp26407536"><span class="identifier">propagate_on_container_swap</span></a><span class="special">;</span> |
| <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> |
| <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> |
| <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> |
| <span class="keyword">typedef</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a><span class="special"><</span> <span class="identifier">rebind_alloc</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">></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> |
| |
| <span class="comment">// member classes/structs/unions</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> |
| <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> |
| <span class="comment">// types</span> |
| <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> |
| <span class="special">}</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="allocator_traits.html#idp26420400-bb">public static functions</a></span> |
| <span class="keyword">static</span> <span class="identifier">pointer</span> <a class="link" href="allocator_traits.html#idp26420960-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idp26424880-bb"><span class="identifier">deallocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <span class="keyword">static</span> <span class="identifier">pointer</span> <a class="link" href="allocator_traits.html#idp26430176-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idp26435264-bb"><span class="identifier">destroy</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <span class="keyword">static</span> <span class="identifier">size_type</span> <a class="link" href="allocator_traits.html#idp26440784-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">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="identifier">Allocator</span> <a class="link" href="allocator_traits.html#idp26444784-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">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> Args<span class="special">></span> |
| <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="allocator_traits.html#idp26448096-bb"><span class="identifier">construct</span></a><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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">&&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="allocator_traits.html#idp26454960-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">&</span><span class="special">,</span> <span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> |
| <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="allocator_traits.html#idp26459648-bb"><span class="identifier">equal</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp143583328"></a><h2>Description</h2> |
| <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> |
| <div class="refsect2"> |
| <a name="idp143585056"></a><h3> |
| <a name="boost.container.allocator_traitstypes"></a><code class="computeroutput">allocator_traits</code> |
| public |
| types</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::pointer if such a type exists; otherwise, value_type* </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::const_pointer if such a type exists ; otherwise, pointer_traits<pointer>::rebind<const </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Non-standard extension Allocator::reference if such a type exists; otherwise, value_type& </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Non-standard extension Allocator::const_reference if such a type exists ; otherwise, const value_type& </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::void_pointer if such a type exists ; otherwise, pointer_traits<pointer>::rebind<void>. </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::const_void_pointer if such a type exists ; otherwis e, pointer_traits<pointer>::rebind<const </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::difference_type if such a type exists ; otherwise, pointer_traits<pointer>::difference_type. </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Allocator::size_type if such a type exists ; otherwise, make_unsigned<difference_type>::type </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagate_on_c_idp26403824"></a><span class="identifier">propagate_on_container_copy_assignment</span><span class="special">;</span></p> |
| <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> |
| </li> |
| <li class="listitem"> |
| <p> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagate_on_c_idp26405680"></a><span class="identifier">propagate_on_container_move_assignment</span><span class="special">;</span></p> |
| <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> |
| </li> |
| <li class="listitem"> |
| <p> |
| <span class="keyword">typedef</span> <span class="identifier">see_documentation</span> <a name="boost.container.allocator_traits.propagate_on_c_idp26407536"></a><span class="identifier">propagate_on_container_swap</span><span class="special">;</span></p> |
| <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> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <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<Allocator>::value </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <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> |
| </li> |
| <li class="listitem"> |
| <p> |
| <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> |
| <p>Defines an allocator: Allocator::rebind<T>::other if such a type exists; otherwise, Allocator<T, Args> if Allocator is a class template instantiation of the form Allocator<U, Args>, where Args is zero or more type arguments ; otherwise, the instantiation of rebind_alloc is ill-formed.</p> |
| <p>In C++03 compilers <code class="computeroutput">rebind_alloc</code> is a struct derived from an allocator deduced by previously detailed rules. </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| <span class="keyword">typedef</span> <a class="link" href="allocator_traits.html" title="Struct template allocator_traits">allocator_traits</a><span class="special"><</span> <span class="identifier">rebind_alloc</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">></span> <a name="boost.container.allocator_traits.rebind_traits"></a><span class="identifier">rebind_traits</span><span class="special">;</span></p> |
| <p>In C++03 compilers <code class="computeroutput">rebind_traits</code> is a struct derived from <code class="computeroutput">allocator_traits<OtherAlloc></code>, where <code class="computeroutput">OtherAlloc</code> is the allocator deduced by rules explained in <code class="computeroutput">rebind_alloc</code>. </p> |
| </li> |
| </ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="idp143659584"></a><h3> |
| <a name="idp26420400-bb"></a><code class="computeroutput">allocator_traits</code> public static functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">pointer</span> <a name="idp26420960-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</span> a<span class="special">,</span> <span class="identifier">size_type</span> n<span class="special">)</span><span class="special">;</span></pre> |
| <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.allocate(n)</code> </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <a name="idp26424880-bb"></a><span class="identifier">deallocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">a.deallocate(p, n)</code></p> |
| <p><span class="bold"><strong>Throws</strong></span>: Nothing </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">pointer</span> <a name="idp26430176-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <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> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">static</span> <span class="keyword">void</span> <a name="idp26435264-bb"></a><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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> |
| <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->~T()</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">size_type</span> <a name="idp26440784-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">&</span> a<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> |
| <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<size_type>::max()</code>. </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">Allocator</span> <a name="idp26444784-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">&</span> a<span class="special">)</span><span class="special">;</span></pre> |
| <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> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> Args<span class="special">></span> |
| <span class="keyword">static</span> <span class="keyword">void</span> <a name="idp26448096-bb"></a><span class="identifier">construct</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="special">&</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">&&</span><span class="special">...</span> args<span class="special">)</span><span class="special">;</span></pre> |
| <p><span class="bold"><strong>Effects</strong></span>: calls <code class="computeroutput">a.construct(p, std::forward<Args>(args)...)</code> if that call is well-formed; otherwise, invokes <code class="computeroutput">::new (static_cast<void*>(p)) T(std::forward<Args>(args)...)</code> </p> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp26454960-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">&</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> |
| <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> |
| </li> |
| <li class="listitem"> |
| <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp26459648-bb"></a><span class="identifier">equal</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&</span> a<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Allocator</span> <span class="special">&</span> b<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre> |
| <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> |
| </li> |
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| <td align="right"><div class="copyright-footer">Copyright © 2009-2013 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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