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25 <div class=
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26 <a name=
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"titlepage"></div>
27 <div class=
"refnamediv">
28 <h2><span class=
"refentrytitle">Class template pool_allocator
</span></h2>
29 <p>boost::pool_allocator
— A C++ Standard Library conforming allocator, based on an underlying pool.
</p>
31 <h2 xmlns:
rev=
"http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class=
"refsynopsisdiv-title">Synopsis
</h2>
32 <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=
"../header/boost/pool/pool_alloc_hpp.html" title=
"Header <boost/pool/pool_alloc.hpp>">boost/pool/pool_alloc.hpp
</a>>
34 </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> UserAllocator
<span class=
"special">,
</span> <span class=
"keyword">typename
</span> Mutex
<span class=
"special">,
</span>
35 <span class=
"keyword">unsigned
</span> NextSize
<span class=
"special">,
</span> <span class=
"keyword">unsigned
</span> MaxSize
<span class=
"special">></span>
36 <span class=
"keyword">class
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> <span class=
"special">{
</span>
37 <span class=
"keyword">public
</span><span class=
"special">:
</span>
38 <span class=
"comment">// types
</span>
39 <span class=
"keyword">typedef
</span> <span class=
"identifier">T
</span> <a name=
"boost.pool_allocator.value_type"></a><span class=
"identifier">value_type
</span><span class=
"special">;
</span> <span class=
"comment">// value_type of template parameter T.
</span>
40 <span class=
"keyword">typedef
</span> <span class=
"identifier">UserAllocator
</span> <a name=
"boost.pool_allocator.user_allocator"></a><span class=
"identifier">user_allocator
</span><span class=
"special">;
</span> <span class=
"comment">// allocator that defines the method that the underlying Pool will use to allocate memory from the system.
</span>
41 <span class=
"keyword">typedef
</span> <span class=
"identifier">Mutex
</span> <a name=
"boost.pool_allocator.mutex"></a><span class=
"identifier">mutex
</span><span class=
"special">;
</span> <span class=
"comment">// typedef mutex publishes the value of the template parameter Mutex.
</span>
42 <span class=
"keyword">typedef
</span> <span class=
"identifier">value_type
</span> <span class=
"special">*
</span> <a name=
"boost.pool_allocator.pointer"></a><span class=
"identifier">pointer
</span><span class=
"special">;
</span>
43 <span class=
"keyword">typedef
</span> <span class=
"keyword">const
</span> <span class=
"identifier">value_type
</span> <span class=
"special">*
</span> <a name=
"boost.pool_allocator.const_pointer"></a><span class=
"identifier">const_pointer
</span><span class=
"special">;
</span>
44 <span class=
"keyword">typedef
</span> <span class=
"identifier">value_type
</span> <span class=
"special">&</span> <a name=
"boost.pool_allocator.reference"></a><span class=
"identifier">reference
</span><span class=
"special">;
</span>
45 <span class=
"keyword">typedef
</span> <span class=
"keyword">const
</span> <span class=
"identifier">value_type
</span> <span class=
"special">&</span> <a name=
"boost.pool_allocator.const_reference"></a><span class=
"identifier">const_reference
</span><span class=
"special">;
</span>
46 <span class=
"keyword">typedef
</span> <a class=
"link" href=
"pool.html" title=
"Class template pool">pool
</a><span class=
"special"><</span> <span class=
"identifier">UserAllocator
</span> <span class=
"special">></span><span class=
"special">::
</span><span class=
"identifier">size_type
</span> <a name=
"boost.pool_allocator.size_type"></a><span class=
"identifier">size_type
</span><span class=
"special">;
</span>
47 <span class=
"keyword">typedef
</span> <a class=
"link" href=
"pool.html" title=
"Class template pool">pool
</a><span class=
"special"><</span> <span class=
"identifier">UserAllocator
</span> <span class=
"special">></span><span class=
"special">::
</span><span class=
"identifier">difference_type
</span> <a name=
"boost.pool_allocator.difference_type"></a><span class=
"identifier">difference_type
</span><span class=
"special">;
</span>
49 <span class=
"comment">// member classes/structs/unions
</span>
51 <span class=
"comment">// Nested class rebind allows for transformation from pool_allocator
<T
> to
52 // pool_allocator
<U
>.
</span>
53 <span class=
"keyword">template
</span><span class=
"special"><</span><span class=
"keyword">typename
</span> U
<span class=
"special">></span>
54 <span class=
"keyword">struct
</span> <a class=
"link" href=
"pool_allocator/rebind.html" title=
"Struct template rebind">rebind
</a> <span class=
"special">{
</span>
55 <span class=
"comment">// types
</span>
56 <span class=
"keyword">typedef
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a><span class=
"special"><</span> <span class=
"identifier">U
</span><span class=
"special">,
</span> <span class=
"identifier">UserAllocator
</span><span class=
"special">,
</span> <span class=
"identifier">Mutex
</span><span class=
"special">,
</span> <span class=
"identifier">NextSize
</span><span class=
"special">,
</span> <span class=
"identifier">MaxSize
</span> <span class=
"special">></span> <a class=
"link" href=
"pool_allocator/rebind.html#boost.pool_allocator.rebind.other"><span class=
"identifier">other
</span></a><span class=
"special">;
</span>
57 <span class=
"special">}
</span><span class=
"special">;
</span>
59 <span class=
"comment">//
<a class=
"link" href=
"pool_allocator.html#boost.pool_allocatorconstruct-copy-destruct">construct/copy/destruct
</a></span>
60 <a class=
"link" href=
"pool_allocator.html#id377842-bb"><span class=
"identifier">pool_allocator
</span></a><span class=
"special">(
</span><span class=
"special">)
</span><span class=
"special">;
</span>
61 <span class=
"keyword">template
</span><span class=
"special"><</span><span class=
"keyword">typename
</span> U
<span class=
"special">></span>
62 <a class=
"link" href=
"pool_allocator.html#id377861-bb"><span class=
"identifier">pool_allocator
</span></a><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a><span class=
"special"><</span> <span class=
"identifier">U
</span><span class=
"special">,
</span> <span class=
"identifier">UserAllocator
</span><span class=
"special">,
</span> <span class=
"identifier">Mutex
</span><span class=
"special">,
</span> <span class=
"identifier">NextSize
</span><span class=
"special">,
</span> <span class=
"identifier">MaxSize
</span> <span class=
"special">></span> <span class=
"special">&</span><span class=
"special">)
</span><span class=
"special">;
</span>
64 <span class=
"comment">//
<a class=
"link" href=
"pool_allocator.html#id377811-bb">public member functions
</a></span>
65 <span class=
"keyword">bool
</span> <a class=
"link" href=
"pool_allocator.html#id377813-bb"><span class=
"keyword">operator
</span><span class=
"special">==
</span></a><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> <span class=
"special">&</span><span class=
"special">)
</span> <span class=
"keyword">const
</span><span class=
"special">;
</span>
66 <span class=
"keyword">bool
</span> <a class=
"link" href=
"pool_allocator.html#id377828-bb"><span class=
"keyword">operator
</span><span class=
"special">!=
</span></a><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> <span class=
"special">&</span><span class=
"special">)
</span> <span class=
"keyword">const
</span><span class=
"special">;
</span>
68 <span class=
"comment">//
<a class=
"link" href=
"pool_allocator.html#id377895-bb">public static functions
</a></span>
69 <span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a class=
"link" href=
"pool_allocator.html#id377897-bb"><span class=
"identifier">address
</span></a><span class=
"special">(
</span><span class=
"identifier">reference
</span><span class=
"special">)
</span><span class=
"special">;
</span>
70 <span class=
"keyword">static
</span> <span class=
"identifier">const_pointer
</span> <a class=
"link" href=
"pool_allocator.html#id377908-bb"><span class=
"identifier">address
</span></a><span class=
"special">(
</span><span class=
"identifier">const_reference
</span><span class=
"special">)
</span><span class=
"special">;
</span>
71 <span class=
"keyword">static
</span> <span class=
"identifier">size_type
</span> <a class=
"link" href=
"pool_allocator.html#id377919-bb"><span class=
"identifier">max_size
</span></a><span class=
"special">(
</span><span class=
"special">)
</span><span class=
"special">;
</span>
72 <span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a class=
"link" href=
"pool_allocator.html#id377925-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=
"keyword">const
</span> <span class=
"identifier">value_type
</span> <span class=
"special">&</span><span class=
"special">)
</span><span class=
"special">;
</span>
73 <span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a class=
"link" href=
"pool_allocator.html#id377940-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>
74 <span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a class=
"link" href=
"pool_allocator.html#id377951-bb"><span class=
"identifier">allocate
</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>
75 <span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a class=
"link" href=
"pool_allocator.html#id377962-bb"><span class=
"identifier">allocate
</span></a><span class=
"special">(
</span><span class=
"keyword">const
</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=
"special">;
</span>
76 <span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a class=
"link" href=
"pool_allocator.html#id377987-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=
"keyword">const
</span> <span class=
"identifier">size_type
</span><span class=
"special">)
</span><span class=
"special">;
</span>
78 <span class=
"comment">// public data members
</span>
79 <span class=
"keyword">static
</span> <span class=
"keyword">const
</span> <span class=
"keyword">unsigned
</span> <span class=
"identifier">next_size
</span><span class=
"special">;
</span> <span class=
"comment">// next_size publishes the values of the template parameter NextSize.
</span>
80 <span class=
"special">}
</span><span class=
"special">;
</span></pre></div>
81 <div class=
"refsect1">
82 <a name=
"id933084"></a><h2>Description
</h2>
83 <p>Template parameters for
<a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> are defined as follows:
</p>
84 <p><span class=
"bold"><strong>T
</strong></span> Type of object to allocate/deallocate.
</p>
85 <p><span class=
"bold"><strong>UserAllocator
</strong></span>. Defines the method that the underlying Pool will use to allocate memory from the system. See
<a href=
"../boost_pool/pool/pooling.html#boost_pool.pool.pooling.user_allocator" target=
"_top">User Allocators
</a> for details.
</p>
86 <p><span class=
"bold"><strong>Mutex
</strong></span> Allows the user to determine the type of synchronization to be used on the underlying
<a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a>.
</p>
87 <p><span class=
"bold"><strong>NextSize
</strong></span> The value of this parameter is passed to the underlying
<a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a> when it is created.
</p>
88 <p><span class=
"bold"><strong>MaxSize
</strong></span> Limit on the maximum size used.
</p>
89 <div class=
"note"><table border=
"0" summary=
"Note">
91 <td rowspan=
"2" align=
"center" valign=
"top" width=
"25"><img alt=
"[Note]" src=
"../../../../../doc/src/images/note.png"></td>
92 <th align=
"left">Note
</th>
94 <tr><td align=
"left" valign=
"top"><p>The underlying
<a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a> used by the this allocator constructs a pool instance that
<span class=
"bold"><strong>is never freed
</strong></span>. This means that memory allocated by the allocator can be still used after main() has completed, but may mean that some memory checking programs will complain about leaks.
</p></td></tr>
98 <div class=
"refsect2">
99 <a name=
"id933157"></a><h3>
100 <a name=
"boost.pool_allocatorconstruct-copy-destruct"></a><code class=
"computeroutput">pool_allocator
</code>
102 construct/copy/destruct
</h3>
103 <div class=
"orderedlist"><ol class=
"orderedlist" type=
"1">
104 <li class=
"listitem">
105 <pre class=
"literallayout"><a name=
"id377842-bb"></a><span class=
"identifier">pool_allocator
</span><span class=
"special">(
</span><span class=
"special">)
</span><span class=
"special">;
</span></pre>
106 <p>Results in default construction of the underlying
<code class=
"computeroutput"><a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a></code> IFF an instance of this allocator is constructed during global initialization ( required to ensure construction of
<code class=
"computeroutput"><a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a></code> IFF an instance of this allocator is constructed during global initialization. See ticket #
2359 for a complete explanation at
<a href=
"http://svn.boost.org/trac/boost/ticket/2359" target=
"_top">http://svn.boost.org/trac/boost/ticket/
2359</a>) .
</p>
108 <li class=
"listitem">
109 <pre class=
"literallayout"><span class=
"keyword">template
</span><span class=
"special"><</span><span class=
"keyword">typename
</span> U
<span class=
"special">></span>
110 <a name=
"id377861-bb"></a><span class=
"identifier">pool_allocator
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a><span class=
"special"><</span> <span class=
"identifier">U
</span><span class=
"special">,
</span> <span class=
"identifier">UserAllocator
</span><span class=
"special">,
</span> <span class=
"identifier">Mutex
</span><span class=
"special">,
</span> <span class=
"identifier">NextSize
</span><span class=
"special">,
</span> <span class=
"identifier">MaxSize
</span> <span class=
"special">></span> <span class=
"special">&</span><span class=
"special">)
</span><span class=
"special">;
</span></pre>
111 <p>Results in the default construction of the underlying
<code class=
"computeroutput"><a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a></code>, this is required to ensure construction of
<code class=
"computeroutput"><a class=
"link" href=
"singleton_pool.html" title=
"Class template singleton_pool">singleton_pool
</a></code> IFF an instance of this allocator is constructed during global initialization. See ticket #
2359 for a complete explanation at
<a href=
"http://svn.boost.org/trac/boost/ticket/2359" target=
"_top">http://svn.boost.org/trac/boost/ticket/
2359</a> .
</p>
115 <div class=
"refsect2">
116 <a name=
"id934733"></a><h3>
117 <a name=
"id377811-bb"></a><code class=
"computeroutput">pool_allocator
</code> public member functions
</h3>
118 <div class=
"orderedlist"><ol class=
"orderedlist" type=
"1">
119 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">bool
</span> <a name=
"id377813-bb"></a><span class=
"keyword">operator
</span><span class=
"special">==
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> <span class=
"special">&</span><span class=
"special">)
</span> <span class=
"keyword">const
</span><span class=
"special">;
</span></pre></li>
120 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">bool
</span> <a name=
"id377828-bb"></a><span class=
"keyword">operator
</span><span class=
"special">!=
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <a class=
"link" href=
"pool_allocator.html" title=
"Class template pool_allocator">pool_allocator
</a> <span class=
"special">&</span><span class=
"special">)
</span> <span class=
"keyword">const
</span><span class=
"special">;
</span></pre></li>
123 <div class=
"refsect2">
124 <a name=
"id934845"></a><h3>
125 <a name=
"id377895-bb"></a><code class=
"computeroutput">pool_allocator
</code> public static functions
</h3>
126 <div class=
"orderedlist"><ol class=
"orderedlist" type=
"1">
127 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a name=
"id377897-bb"></a><span class=
"identifier">address
</span><span class=
"special">(
</span><span class=
"identifier">reference
</span> r
<span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
128 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"identifier">const_pointer
</span> <a name=
"id377908-bb"></a><span class=
"identifier">address
</span><span class=
"special">(
</span><span class=
"identifier">const_reference
</span> s
<span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
129 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"identifier">size_type
</span> <a name=
"id377919-bb"></a><span class=
"identifier">max_size
</span><span class=
"special">(
</span><span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
130 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a name=
"id377925-bb"></a><span class=
"identifier">construct
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <span class=
"identifier">pointer
</span> ptr
<span class=
"special">,
</span> <span class=
"keyword">const
</span> <span class=
"identifier">value_type
</span> <span class=
"special">&</span> t
<span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
131 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a name=
"id377940-bb"></a><span class=
"identifier">destroy
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <span class=
"identifier">pointer
</span> ptr
<span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
132 <li class=
"listitem"><pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a name=
"id377951-bb"></a><span class=
"identifier">allocate
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <span class=
"identifier">size_type
</span> n
<span class=
"special">)
</span><span class=
"special">;
</span></pre></li>
133 <li class=
"listitem">
134 <pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"identifier">pointer
</span> <a name=
"id377962-bb"></a><span class=
"identifier">allocate
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <span class=
"identifier">size_type
</span> n
<span class=
"special">,
</span> <span class=
"keyword">const
</span> <span class=
"keyword">void
</span> <span class=
"special">*
</span> const
<span class=
"special">)
</span><span class=
"special">;
</span></pre>
135 <p>allocate n bytes
</p>
138 <div class=
"variablelist"><table border=
"0">
139 <col align=
"left" valign=
"top">
141 <td><p><span class=
"term">Parameters:
</span></p></td>
142 <td><div class=
"variablelist"><table border=
"0">
143 <col align=
"left" valign=
"top">
145 <td><p><span class=
"term"><code class=
"computeroutput">n
</code></span></p></td>
146 <td><p>bytes to allocate.
</p></td>
152 <li class=
"listitem">
153 <pre class=
"literallayout"><span class=
"keyword">static
</span> <span class=
"keyword">void
</span> <a name=
"id377987-bb"></a><span class=
"identifier">deallocate
</span><span class=
"special">(
</span><span class=
"keyword">const
</span> <span class=
"identifier">pointer
</span> ptr
<span class=
"special">,
</span> <span class=
"keyword">const
</span> <span class=
"identifier">size_type
</span> n
<span class=
"special">)
</span><span class=
"special">;
</span></pre>
154 <p>Deallocate n bytes from ptr
156 <div class=
"variablelist"><table border=
"0">
157 <col align=
"left" valign=
"top">
159 <td><p><span class=
"term">Parameters:
</span></p></td>
160 <td><div class=
"variablelist"><table border=
"0">
161 <col align=
"left" valign=
"top">
164 <td><p><span class=
"term"><code class=
"computeroutput">n
</code></span></p></td>
165 <td><p>number of bytes to deallocate.
</p></td>
168 <td><p><span class=
"term"><code class=
"computeroutput">ptr
</code></span></p></td>
169 <td><p>location to deallocate from.
</p></td>
178 <div class=
"refsect2">
179 <a name=
"id935438"></a><h3>Specializations
</h3>
180 <div class=
"itemizedlist"><ul class=
"itemizedlist" type=
"disc"><li class=
"listitem"><p><a class=
"link" href=
"pool_allocator_void__UserAllocator__M_id378014.html" title=
"Class template pool_allocator<void, UserAllocator, Mutex, NextSize, MaxSize>">Class template pool_allocator
<void, UserAllocator, Mutex, NextSize, MaxSize
></a></p></li></ul></div>
184 <table xmlns:
rev=
"http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width=
"100%"><tr>
185 <td align=
"left"></td>
186 <td align=
"right"><div class=
"copyright-footer">Copyright
© 2000-
2006 Stephen Cleary
<br>Copyright
© 2011 Paul A. Bristow
<p>
187 Distributed under the Boost Software License, Version
1.0. (See accompanying
188 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>)
193 <div class=
"spirit-nav">
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