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  26 <div class="refentry">
  27 <a name="boost.container.pmr.monotonic_buffer_resource"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Class monotonic_buffer_resource</span></h2>
  30 <p>boost::container::pmr::monotonic_buffer_resource</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../boost_container_header_reference.html#header.boost.container.pmr.monotonic_buffer_resource_hpp" title="Header &lt;boost/container/pmr/monotonic_buffer_resource.hpp&gt;">boost/container/pmr/monotonic_buffer_resource.hpp</a>&gt;
  34
  35 </span>
  36 <span class="keyword">class</span> <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> <span class="special">:</span>
  37   <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">container</span><span class="special">::</span><span class="identifier">pmr</span><span class="special">::</span><span class="identifier">memory_resource</span>
  38 <span class="special">{</span>
  39 <span class="keyword">public</span><span class="special">:</span>
  40   <span class="comment">// <a class="link" href="monotonic_buffer_resource.html#boost.container.pmr.monotonic_buffer_resourceconstruct-copy-destruct">construct/copy/destruct</a></span>
  41   <span class="keyword">explicit</span> <a class="link" href="monotonic_buffer_resource.html#idp50788256-bb"><span class="identifier">monotonic_buffer_resource</span></a><span class="special">(</span><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  42   <span class="keyword">explicit</span> <a class="link" href="monotonic_buffer_resource.html#idp50795280-bb"><span class="identifier">monotonic_buffer_resource</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> <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  43   <a class="link" href="monotonic_buffer_resource.html#idp50804048-bb"><span class="identifier">monotonic_buffer_resource</span></a><span class="special">(</span><span class="keyword">void</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  44   <a class="link" href="monotonic_buffer_resource.html#idp50813808-bb"><span class="identifier">monotonic_buffer_resource</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
  45   <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a>
  46   <a class="link" href="monotonic_buffer_resource.html#idp50815520-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
  47   <a class="link" href="monotonic_buffer_resource.html#idp50817664-bb"><span class="special">~</span><span class="identifier">monotonic_buffer_resource</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  48
  49   <span class="comment">// <a class="link" href="monotonic_buffer_resource.html#idp50767504-bb">public member functions</a></span>
  50   <span class="keyword">void</span> <a class="link" href="monotonic_buffer_resource.html#idp50768064-bb"><span class="identifier">release</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  51   <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <a class="link" href="monotonic_buffer_resource.html#idp50771216-bb"><span class="identifier">upstream_resource</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  52   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp50773616-bb"><span class="identifier">remaining_storage</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">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  53   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp50778064-bb"><span class="identifier">remaining_storage</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="number">1u</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  54   <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="monotonic_buffer_resource.html#idp50782048-bb"><span class="identifier">current_buffer</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  55   <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp50785056-bb"><span class="identifier">next_buffer_size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  56
  57   <span class="comment">// <a class="link" href="monotonic_buffer_resource.html#idp50819376-bb">protected member functions</a></span>
  58   <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="monotonic_buffer_resource.html#idp50819952-bb"><span class="identifier">do_allocate</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">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span><span class="special">;</span>
  59   <span class="keyword">virtual</span> <span class="keyword">void</span> <a class="link" href="monotonic_buffer_resource.html#idp50831376-bb"><span class="identifier">do_deallocate</span></a><span class="special">(</span><span class="keyword">void</span> <span class="special">*</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">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  60   <span class="keyword">virtual</span> <span class="keyword">bool</span> <a class="link" href="monotonic_buffer_resource.html#idp50837568-bb"><span class="identifier">do_is_equal</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  61
  62   <span class="comment">// <a class="link" href="monotonic_buffer_resource.html#boost.container.pmr.monotonic_buffer_resourcepublic-data-members">public data members</a></span>
  63   <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#boost.container.pmr.monotonic_buffer_resource.initial_next_buffer_size"><span class="identifier">initial_next_buffer_size</span></a><span class="special">;</span>
  64 <span class="special">}</span><span class="special">;</span></pre></div>
  65 <div class="refsect1">
  66 <a name="idp192265600"></a><h2>Description</h2>
  67 <p>A <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> is a special-purpose memory resource intended for very fast memory allocations in situations where memory is used to build up a few objects and then is released all at once when the memory resource object is destroyed. It has the following qualities:</p>
  68 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  69 <li class="listitem"><p>A call to deallocate has no effect, thus the amount of memory consumed increases monotonically until the resource is destroyed.</p></li>
  70 <li class="listitem"><p>The program can supply an initial buffer, which the allocator uses to satisfy memory requests.</p></li>
  71 <li class="listitem"><p>When the initial buffer (if any) is exhausted, it obtains additional buffers from an upstream memory resource supplied at construction. Each additional buffer is larger than the previous one, following a geometric progression.</p></li>
  72 <li class="listitem"><p>It is intended for access from one thread of control at a time. Specifically, calls to allocate and deallocate do not synchronize with one another.</p></li>
  73 <li class="listitem"><p>It owns the allocated memory and frees it on destruction, even if deallocate has not been called for some of the allocated blocks. </p></li>
  74 </ul></div>
  75 <p>
  76 </p>
  77 <div class="refsect2">
  78 <a name="idp192270720"></a><h3>
  79 <a name="boost.container.pmr.monotonic_buffer_resourceconstruct-copy-destruct"></a><code class="computeroutput">monotonic_buffer_resource</code>
  80         public
  81        construct/copy/destruct</h3>
  82 <div class="orderedlist"><ol class="orderedlist" type="1">
  83 <li class="listitem">
  84 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp50788256-bb"></a><span class="identifier">monotonic_buffer_resource</span><span class="special">(</span><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> upstream <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  85 <p><span class="bold"><strong>Requires</strong></span>: <code class="computeroutput">upstream</code> shall be the address of a valid memory resource or <code class="computeroutput">nullptr</code></p>
  86 <p><span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput">upstream</code> is not nullptr, sets the internal resource to <code class="computeroutput">upstream</code>, to get_default_resource() otherwise. Sets the internal <code class="computeroutput">current_buffer</code> to <code class="computeroutput">nullptr</code> and the internal <code class="computeroutput">next_buffer_size</code> to an implementation-defined size. </p>
  87 </li>
  88 <li class="listitem">
  89 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp50795280-bb"></a><span class="identifier">monotonic_buffer_resource</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> initial_size<span class="special">,</span>
  90                                    <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> upstream <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  91 <p><span class="bold"><strong>Requires</strong></span>: <code class="computeroutput">upstream</code> shall be the address of a valid memory resource or <code class="computeroutput">nullptr</code> and <code class="computeroutput">initial_size</code> shall be greater than zero.</p>
  92 <p><span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput">upstream</code> is not nullptr, sets the internal resource to <code class="computeroutput">upstream</code>, to get_default_resource() otherwise. Sets the internal <code class="computeroutput">current_buffer</code> to <code class="computeroutput">nullptr</code> and <code class="computeroutput">next_buffer_size</code> to at least <code class="computeroutput">initial_size</code>. </p>
  93 </li>
  94 <li class="listitem">
  95 <pre class="literallayout"><a name="idp50804048-bb"></a><span class="identifier">monotonic_buffer_resource</span><span class="special">(</span><span class="keyword">void</span> <span class="special">*</span> buffer<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> buffer_size<span class="special">,</span>
  96                           <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> upstream <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
  97 <p><span class="bold"><strong>Requires</strong></span>: <code class="computeroutput">upstream</code> shall be the address of a valid memory resource or <code class="computeroutput">nullptr</code>, <code class="computeroutput">buffer_size</code> shall be no larger than the number of bytes in buffer.</p>
  98 <p><span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput">upstream</code> is not nullptr, sets the internal resource to <code class="computeroutput">upstream</code>, to get_default_resource() otherwise. Sets the internal <code class="computeroutput">current_buffer</code> to <code class="computeroutput">buffer</code>, and <code class="computeroutput">next_buffer_size</code> to <code class="computeroutput">buffer_size</code> (but not less than an implementation-defined size), then increases <code class="computeroutput">next_buffer_size</code> by an implementation-defined growth factor (which need not be integral). </p>
  99 </li>
 100 <li class="listitem"><pre class="literallayout"><a name="idp50813808-bb"></a><span class="identifier">monotonic_buffer_resource</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
 101 <li class="listitem"><pre class="literallayout"><a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a>
 102 <a name="idp50815520-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
 103 <li class="listitem">
 104 <pre class="literallayout"><a name="idp50817664-bb"></a><span class="special">~</span><span class="identifier">monotonic_buffer_resource</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 105 <p><span class="bold"><strong>Effects</strong></span>: Calls <code class="computeroutput">this-&gt;release()</code>. </p>
 106 </li>
 107 </ol></div>
 108 </div>
 109 <div class="refsect2">
 110 <a name="idp192347648"></a><h3>
 111 <a name="idp50767504-bb"></a><code class="computeroutput">monotonic_buffer_resource</code> public member functions</h3>
 112 <div class="orderedlist"><ol class="orderedlist" type="1">
 113 <li class="listitem">
 114 <pre class="literallayout"><span class="keyword">void</span> <a name="idp50768064-bb"></a><span class="identifier">release</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 115 <p><span class="bold"><strong>Effects</strong></span>: <code class="computeroutput">upstream_resource()-&gt;deallocate()</code> as necessary to release all allocated memory. [Note: memory is released back to <code class="computeroutput">upstream_resource()</code> even if some blocks that were allocated from this have not been deallocated from this. - end note] </p>
 116 </li>
 117 <li class="listitem">
 118 <pre class="literallayout"><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <a name="idp50771216-bb"></a><span class="identifier">upstream_resource</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 119 <p><span class="bold"><strong>Returns</strong></span>: The value of the internal resource. </p>
 120 </li>
 121 <li class="listitem">
 122 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp50773616-bb"></a><span class="identifier">remaining_storage</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> alignment<span class="special">,</span>
 123                               <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">&amp;</span> wasted_due_to_alignment<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 124 <p><span class="bold"><strong>Returns</strong></span>: The number of bytes of storage available for the specified alignment and the number of bytes wasted due to the requested alignment.</p>
 125 <p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
 126 </li>
 127 <li class="listitem">
 128 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp50778064-bb"></a><span class="identifier">remaining_storage</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> alignment <span class="special">=</span> <span class="number">1u</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 129 <p><span class="bold"><strong>Returns</strong></span>: The number of bytes of storage available for the specified alignment.</p>
 130 <p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
 131 </li>
 132 <li class="listitem">
 133 <pre class="literallayout"><span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <a name="idp50782048-bb"></a><span class="identifier">current_buffer</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 134 <p><span class="bold"><strong>Returns</strong></span>: The number of bytes of storage available for the specified alignment.</p>
 135 <p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
 136 </li>
 137 <li class="listitem">
 138 <pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp50785056-bb"></a><span class="identifier">next_buffer_size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 139 <p><span class="bold"><strong>Returns</strong></span>: The number of bytes that will be requested for the next buffer once the current one is exhausted.</p>
 140 <p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
 141 </li>
 142 </ol></div>
 143 </div>
 144 <div class="refsect2">
 145 <a name="idp192406992"></a><h3>
 146 <a name="idp50819376-bb"></a><code class="computeroutput">monotonic_buffer_resource</code> protected member functions</h3>
 147 <div class="orderedlist"><ol class="orderedlist" type="1">
 148 <li class="listitem">
 149 <pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">void</span> <span class="special">*</span> <a name="idp50819952-bb"></a><span class="identifier">do_allocate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> bytes<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> alignment<span class="special">)</span><span class="special">;</span></pre>
 150 <p><span class="bold"><strong>Returns</strong></span>: A pointer to allocated storage with a size of at least <code class="computeroutput">bytes</code>. The size and alignment of the allocated memory shall meet the requirements for a class derived from <code class="computeroutput"><code class="computeroutput"><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a></code></code>.</p>
 151 <p><span class="bold"><strong>Effects</strong></span>: If the unused space in the internal <code class="computeroutput">current_buffer</code> can fit a block with the specified bytes and alignment, then allocate the return block from the internal <code class="computeroutput">current_buffer</code>; otherwise sets the internal <code class="computeroutput">current_buffer</code> to <code class="computeroutput">upstream_resource()-&gt;allocate(n, m)</code>, where <code class="computeroutput">n</code> is not less than <code class="computeroutput">max(bytes, next_buffer_size)</code> and <code class="computeroutput">m</code> is not less than alignment, and increase <code class="computeroutput">next_buffer_size</code> by an implementation-defined growth factor (which need not be integral), then allocate the return block from the newly-allocated internal <code class="computeroutput">current_buffer</code>.</p>
 152 <p><span class="bold"><strong>Throws</strong></span>: Nothing unless <code class="computeroutput">upstream_resource()-&gt;allocate()</code> throws. </p>
 153 </li>
 154 <li class="listitem">
 155 <pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">void</span>
 156 <a name="idp50831376-bb"></a><span class="identifier">do_deallocate</span><span class="special">(</span><span class="keyword">void</span> <span class="special">*</span> p<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> bytes<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> alignment<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 157 <p><span class="bold"><strong>Effects</strong></span>: None</p>
 158 <p><span class="bold"><strong>Throws</strong></span>: Nothing</p>
 159 <p><span class="bold"><strong>Remarks</strong></span>: Memory used by this resource increases monotonically until its destruction. </p>
 160 </li>
 161 <li class="listitem">
 162 <pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">bool</span> <a name="idp50837568-bb"></a><span class="identifier">do_is_equal</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">&amp;</span> other<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 163 <p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">this == dynamic_cast&lt;const monotonic_buffer_resource*&gt;(&amp;other)</code>. </p>
 164 </li>
 165 </ol></div>
 166 </div>
 167 <div class="refsect2">
 168 <a name="idp192456352"></a><h3>
 169 <a name="boost.container.pmr.monotonic_buffer_resourcepublic-data-members"></a><code class="computeroutput">monotonic_buffer_resource</code>
 170         public
 171        public data members</h3>
 172 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
 173 <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="boost.container.pmr.monotonic_buffer_resource.initial_next_buffer_size"></a><span class="identifier">initial_next_buffer_size</span><span class="special">;</span></pre>
 174 <p>The number of bytes that will be requested by the default in the first call to the upstream allocator</p>
 175 <p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
 176 </li></ol></div>
 177 </div>
 178 </div>
 179 </div>
 180 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 181 <td align="left"></td>
 182 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2015 Ion Gaztanaga<p>
 183         Distributed under the Boost Software License, Version 1.0. (See accompanying
 184         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>)
 185       </p>
 186 </div></td>
 187 </tr></table>
 188 <hr>
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