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<div class="refentry">
<a name="boost.container.node_allocator"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template node_allocator</span></h2>
<p>boost::container::node_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="../../boost_container_header_reference.html#header.boost.container.node_allocator_hpp" title="Header <boost/container/node_allocator.hpp>">boost/container/node_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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> NodesPerBlock <span class="special">=</span> <span class="identifier">NodeAlloc_nodes_per_block</span><span class="special">></span>
<span class="keyword">class</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_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">T</span> <a name="boost.container.node_allocator.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">T</span> <span class="special">*</span> <a name="boost.container.node_allocator.pointer"></a><span class="identifier">pointer</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span> <a name="boost.container.node_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.container.node_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.container.node_allocator.const_reference"></a><span class="identifier">const_reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="boost.container.node_allocator.size_type"></a><span class="identifier">size_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <a name="boost.container.node_allocator.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.container.node_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="node_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="node_allocator.html" title="Class template node_allocator">node_allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">NodesPerBlock</span> <span class="special">></span> <a class="link" href="node_allocator/rebind.html#boost.container.node_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="node_allocator.html#boost.container.node_allocatorconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="node_allocator.html#idm46583871737008-bb"><span class="identifier">node_allocator</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<a class="link" href="node_allocator.html#idm46583871736160-bb"><span class="identifier">node_allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</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="node_allocator.html#idm46583871733424-bb"><span class="identifier">node_allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">NodesPerBlock</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<a class="link" href="node_allocator.html#idm46583871729840-bb"><span class="special">~</span><span class="identifier">node_allocator</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="node_allocator.html#idm46583871768176-bb">public member functions</a></span>
<span class="identifier">size_type</span> <a class="link" href="node_allocator.html#idm46583871767616-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">pointer</span> <a class="link" href="node_allocator.html#idm46583871766032-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</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="node_allocator.html#idm46583871763024-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="keyword">noexcept</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="node_allocator.html#idm46583871760080-bb"><span class="identifier">allocation_command</span></a><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="identifier">size_type</span> <a class="link" href="node_allocator.html#idm46583871756464-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="identifier">pointer</span> <a class="link" href="node_allocator.html#idm46583871754160-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="node_allocator.html#idm46583871752752-bb"><span class="identifier">allocate_individual</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</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="node_allocator.html#idm46583871750032-bb"><span class="identifier">deallocate_one</span></a><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">void</span> <a class="link" href="node_allocator.html#idm46583871747632-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="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="node_allocator.html#idm46583871745824-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">std</span><span class="special">::</span><span class="identifier">size_t</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="node_allocator.html#idm46583871742416-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="node_allocator.html#idm46583871738976-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="keyword">noexcept</span><span class="special">;</span>
<span class="comment">// <a class="link" href="node_allocator.html#idm46583871729264-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="node_allocator.html#idm46583871728704-bb"><span class="identifier">deallocate_free_blocks</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="comment">// <a class="link" href="node_allocator.html#idm46583871726832-bb">friend functions</a></span>
<span class="keyword">friend</span> <span class="keyword">void</span> <a class="link" href="node_allocator.html#idm46583871726272-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="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="node_allocator.html#idm46583871723264-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="node_allocator.html#idm46583871719360-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="comment">// <a class="link" href="node_allocator.html#idm46583871715296-bb">private member functions</a></span>
<span class="identifier">pointer</span> <a class="link" href="node_allocator.html#idm46583871714720-bb"><span class="identifier">priv_allocation_command</span></a><span class="special">(</span><span class="identifier">allocation_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</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="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555399839040"></a><h2>Description</h2>
<p>An STL node allocator that uses a modified DlMalloc as memory source.</p>
<p>This node allocator shares a segregated storage between all instances of <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> with equal sizeof(T).</p>
<p>NodesPerBlock is the number of nodes allocated at once when the allocator runs out of nodes </p>
<div class="refsect2">
<a name="idm45555399836656"></a><h3>
<a name="boost.container.node_allocatorconstruct-copy-destruct"></a><code class="computeroutput">node_allocator</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm46583871737008-bb"></a><span class="identifier">node_allocator</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>Default constructor. </li>
<li class="listitem">
<pre class="literallayout"><a name="idm46583871736160-bb"></a><span class="identifier">node_allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>Copy constructor from other <code class="computeroutput"><a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a></code>. </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="idm46583871733424-bb"></a><span class="identifier">node_allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a><span class="special"><</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">NodesPerBlock</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>Copy constructor from related <code class="computeroutput"><a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a></code>. </li>
<li class="listitem">
<pre class="literallayout"><a name="idm46583871729840-bb"></a><span class="special">~</span><span class="identifier">node_allocator</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destructor. </li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555399804448"></a><h3>
<a name="idm46583871768176-bb"></a><code class="computeroutput">node_allocator</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm46583871767616-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">pointer</span> <a name="idm46583871766032-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">size_type</span> count<span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>
<p>Allocate memory for an array of count elements. Throws std::bad_alloc if there is no enough memory </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871763024-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> count<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Deallocate allocated memory. Never throws </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="identifier">pointer</span> <a name="idm46583871760080-bb"></a><span class="identifier">allocation_command</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="identifier">size_type</span> <a name="idm46583871756464-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="identifier">pointer</span> p<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Returns maximum the number of objects the previously allocated memory pointed by p can hold. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm46583871754160-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 bad_alloc if there is no enough memory </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871752752-bb"></a><span class="identifier">allocate_individual</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</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. Elements must be individually deallocated with deallocate_one() </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871750032-bb"></a><span class="identifier">deallocate_one</span><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>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="idm46583871747632-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="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871745824-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">std</span><span class="special">::</span><span class="identifier">size_t</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 many elements of size elem_size. Elements must be individually deallocated with deallocate() </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871742416-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] Elements must be individually deallocated with deallocate() </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="idm46583871738976-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="keyword">noexcept</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555399709520"></a><h3>
<a name="idm46583871729264-bb"></a><code class="computeroutput">node_allocator</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="keyword">void</span> <a name="idm46583871728704-bb"></a><span class="identifier">deallocate_free_blocks</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>Deallocates all free blocks of the pool. </li></ol></div>
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<a name="idm45555399701536"></a><h3>
<a name="idm46583871726832-bb"></a><code class="computeroutput">node_allocator</code> friend functions</h3>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">void</span> <a name="idm46583871726272-bb"></a><span class="identifier">swap</span><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="keyword">noexcept</span><span class="special">;</span></pre>
<p>Swaps allocators. Does not throw. If each allocator is placed in a different memory segment, the result is undefined. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm46583871723264-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>An allocator always compares to true, as memory allocated with one instance can be deallocated by another instance </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm46583871719360-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="node_allocator.html" title="Class template node_allocator">node_allocator</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>An allocator always compares to false, as memory allocated with one instance can be deallocated by another instance </p>
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<a name="idm45555399667264"></a><h3>
<a name="idm46583871715296-bb"></a><code class="computeroutput">node_allocator</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="identifier">pointer</span> <a name="idm46583871714720-bb"></a><span class="identifier">priv_allocation_command</span><span class="special">(</span><span class="identifier">allocation_type</span> command<span class="special">,</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</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></ol></div>
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