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<a name="boost.interprocess.allocator"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template allocator</span></h2>
<p>boost::interprocess::allocator</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="../../interprocess/indexes_reference.html#header.boost.interprocess.allocators.allocator_hpp" title="Header <boost/interprocess/allocators/allocator.hpp>">boost/interprocess/allocators/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> SegmentManager<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">SegmentManager</span> <a name="boost.interprocess.allocator.segment_manager"></a><span class="identifier">segment_manager</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">SegmentManager</span><span class="special">::</span><span class="identifier">void_pointer</span> <a name="boost.interprocess.allocator.void_pointer"></a><span class="identifier">void_pointer</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">T</span> <a name="boost.interprocess.allocator.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">pointer_traits</span><span class="special"><</span> <span class="identifier">cvoid_ptr</span> <span class="special">></span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind_pointer</span><span class="special"><</span> <span class="identifier">T</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.interprocess.allocator.pointer"></a><span class="identifier">pointer</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">intrusive</span><span class="special">::</span><span class="identifier">pointer_traits</span><span class="special"><</span> <span class="identifier">pointer</span> <span class="special">></span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind_pointer</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="boost.interprocess.allocator.const_pointer"></a><span class="identifier">const_pointer</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.interprocess.allocator.reference"></a><span class="identifier">reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.interprocess.allocator.const_reference"></a><span class="identifier">const_reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">segment_manager</span><span class="special">::</span><span class="identifier">size_type</span> <a name="boost.interprocess.allocator.size_type"></a><span class="identifier">size_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">segment_manager</span><span class="special">::</span><span class="identifier">difference_type</span> <a name="boost.interprocess.allocator.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">interprocess</span><span class="special">::</span><span class="identifier">version_type</span><span class="special"><</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special">,</span> <span class="number">2</span> <span class="special">></span> <a name="boost.interprocess.allocator.version"></a><span class="identifier">version</span><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> T2<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="allocator/rebind.html" title="Struct template rebind">rebind</a> <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">SegmentManager</span> <span class="special">></span> <a class="link" href="allocator/rebind.html#boost.interprocess.allocator.rebind.other"><span class="identifier">other</span></a><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="allocator.html#boost.interprocess.allocatorconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="allocator.html#idm45879392406416-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="identifier">segment_manager</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="allocator.html#idm45879392404992-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <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> T2<span class="special">></span> <a class="link" href="allocator.html#idm45879392403120-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">SegmentManager</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="allocator.html#idm45879392451648-bb">public member functions</a></span>
<span class="identifier">segment_manager</span> <span class="special">*</span> <a class="link" href="allocator.html#idm45879392451088-bb"><span class="identifier">get_segment_manager</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="allocator.html#idm45879392449520-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">cvoid_ptr</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392445776-bb"><span class="identifier">deallocate</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</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="identifier">size_type</span> <a class="link" href="allocator.html#idm45879392443104-bb"><span class="identifier">max_size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">size_type</span> <a class="link" href="allocator.html#idm45879392441520-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="allocator.html#idm45879392439120-bb"><span class="identifier">allocation_command</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">interprocess</span><span class="special">::</span><span class="identifier">allocation_type</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span>
<span class="identifier">size_type</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392435488-bb"><span class="identifier">allocate_many</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392431856-bb"><span class="identifier">allocate_many</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">size_type</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392428416-bb"><span class="identifier">deallocate_many</span></a><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="allocator.html#idm45879392426160-bb"><span class="identifier">allocate_one</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392424032-bb"><span class="identifier">allocate_individual</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392421072-bb"><span class="identifier">deallocate_one</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392418944-bb"><span class="identifier">deallocate_individual</span></a><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="allocator.html#idm45879392416672-bb"><span class="identifier">address</span></a><span class="special">(</span><span class="identifier">reference</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">const_pointer</span> <a class="link" href="allocator.html#idm45879392414416-bb"><span class="identifier">address</span></a><span class="special">(</span><span class="identifier">const_reference</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> P<span class="special">></span> <span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392412160-bb"><span class="identifier">construct</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">P</span> <span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392408560-bb"><span class="identifier">destroy</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="allocator.html#idm45879392400384-bb">friend functions</a></span>
<span class="keyword">friend</span> <span class="keyword">void</span> <a class="link" href="allocator.html#idm45879392399824-bb"><span class="identifier">swap</span></a><span class="special">(</span><span class="identifier">self_t</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">self_t</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555325588048"></a><h2>Description</h2>
<p>An STL compatible allocator that uses a segment manager as memory source. The internal pointer type will of the same type (raw, smart) as "typename SegmentManager::void_pointer" type. This allows placing the allocator in shared memory, memory mapped-files, etc... </p>
<div class="refsect2">
<a name="idm45555325587088"></a><h3>
<a name="boost.interprocess.allocatorconstruct-copy-destruct"></a><code class="computeroutput">allocator</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm45879392406416-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="identifier">segment_manager</span> <span class="special">*</span> segment_mngr<span class="special">)</span><span class="special">;</span></pre>
<p>Constructor from the segment manager. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm45879392404992-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Constructor from other allocator. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T2<span class="special">></span> <a name="idm45879392403120-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">SegmentManager</span> <span class="special">></span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Constructor from related allocator. Never throws </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555325561472"></a><h3>
<a name="idm45879392451648-bb"></a><code class="computeroutput">allocator</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">segment_manager</span> <span class="special">*</span> <a name="idm45879392451088-bb"></a><span class="identifier">get_segment_manager</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the segment manager. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm45879392449520-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">size_type</span> count<span class="special">,</span> <span class="identifier">cvoid_ptr</span> hint <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>
<p>Allocates memory for an array of count elements. Throws <code class="computeroutput"><a class="link" href="bad_alloc.html" title="Class bad_alloc">boost::interprocess::bad_alloc</a></code> if there is no enough memory </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392445776-bb"></a><span class="identifier">deallocate</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> ptr<span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span></pre>
<p>Deallocates memory previously allocated. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45879392443104-bb"></a><span class="identifier">max_size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the number of elements that could be allocated. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45879392441520-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> p<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns maximum the number of objects the previously allocated memory pointed by p can hold. This size only works for memory allocated with allocate, allocation_command and allocate_many. </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="identifier">pointer</span> <a name="idm45879392439120-bb"></a><span class="identifier">allocation_command</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">interprocess</span><span class="special">::</span><span class="identifier">allocation_type</span> command<span class="special">,</span>
<span class="identifier">size_type</span> limit_size<span class="special">,</span>
<span class="identifier">size_type</span> <span class="special">&</span> prefer_in_recvd_out_size<span class="special">,</span>
<span class="identifier">pointer</span> <span class="special">&</span> reuse<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392435488-bb"></a><span class="identifier">allocate_many</span><span class="special">(</span><span class="identifier">size_type</span> elem_size<span class="special">,</span> <span class="identifier">size_type</span> num_elements<span class="special">,</span>
<span class="identifier">multiallocation_chain</span> <span class="special">&</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size elem_size in a contiguous block of memory. The minimum number to be allocated is min_elements, the preferred and maximum number is preferred_elements. The number of actually allocated elements is will be assigned to received_size. The elements must be deallocated with deallocate(...) </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392431856-bb"></a><span class="identifier">allocate_many</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">size_type</span> <span class="special">*</span> elem_sizes<span class="special">,</span> <span class="identifier">size_type</span> n_elements<span class="special">,</span>
<span class="identifier">multiallocation_chain</span> <span class="special">&</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates n_elements elements, each one of size elem_sizes[i]in a contiguous block of memory. The elements must be deallocated </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392428416-bb"></a><span class="identifier">deallocate_many</span><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size elem_size in a contiguous block of memory. The minimum number to be allocated is min_elements, the preferred and maximum number is preferred_elements. The number of actually allocated elements is will be assigned to received_size. The elements must be deallocated with deallocate(...) </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm45879392426160-bb"></a><span class="identifier">allocate_one</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Allocates just one object. Memory allocated with this function must be deallocated only with deallocate_one(). Throws <code class="computeroutput"><a class="link" href="bad_alloc.html" title="Class bad_alloc">boost::interprocess::bad_alloc</a></code> if there is no enough memory </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392424032-bb"></a><span class="identifier">allocate_individual</span><span class="special">(</span><span class="identifier">size_type</span> num_elements<span class="special">,</span>
<span class="identifier">multiallocation_chain</span> <span class="special">&</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size == 1 in a contiguous block of memory. The minimum number to be allocated is min_elements, the preferred and maximum number is preferred_elements. The number of actually allocated elements is will be assigned to received_size. Memory allocated with this function must be deallocated only with deallocate_one(). </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392421072-bb"></a><span class="identifier">deallocate_one</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> p<span class="special">)</span><span class="special">;</span></pre>
<p>Deallocates memory previously allocated with allocate_one(). You should never use deallocate_one to deallocate memory allocated with other functions different from allocate_one(). Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392418944-bb"></a><span class="identifier">deallocate_individual</span><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size == 1 in a contiguous block of memory. The minimum number to be allocated is min_elements, the preferred and maximum number is preferred_elements. The number of actually allocated elements is will be assigned to received_size. Memory allocated with this function must be deallocated only with deallocate_one(). </p>
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<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm45879392416672-bb"></a><span class="identifier">address</span><span class="special">(</span><span class="identifier">reference</span> value<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns address of mutable object. Never throws </p>
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<pre class="literallayout"><span class="identifier">const_pointer</span> <a name="idm45879392414416-bb"></a><span class="identifier">address</span><span class="special">(</span><span class="identifier">const_reference</span> value<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns address of non mutable object. Never throws </p>
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<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> P<span class="special">></span> <span class="keyword">void</span> <a name="idm45879392412160-bb"></a><span class="identifier">construct</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> ptr<span class="special">,</span> <span class="identifier">P</span> <span class="special">&&</span> p<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs an object Throws if T's constructor throws For backwards compatibility with libraries using C++03 allocators </p>
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<pre class="literallayout"><span class="keyword">void</span> <a name="idm45879392408560-bb"></a><span class="identifier">destroy</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pointer</span> <span class="special">&</span> ptr<span class="special">)</span><span class="special">;</span></pre>
<p>Destroys object. Throws if object's destructor throws </p>
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<div class="refsect2">
<a name="idm45555325428496"></a><h3>
<a name="idm45879392400384-bb"></a><code class="computeroutput">allocator</code> friend functions</h3>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">void</span> <a name="idm45879392399824-bb"></a><span class="identifier">swap</span><span class="special">(</span><span class="identifier">self_t</span> <span class="special">&</span> alloc1<span class="special">,</span> <span class="identifier">self_t</span> <span class="special">&</span> alloc2<span class="special">)</span><span class="special">;</span></pre>
<p>Swap segment manager. Does not throw. If each allocator is placed in different memory segments, the result is undefined. </p>
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