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<a name="boost.container.pmr.monotonic_buffer_resource"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class monotonic_buffer_resource</span></h2>
<p>boost::container::pmr::monotonic_buffer_resource</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.pmr.monotonic_buffer_resource_hpp" title="Header <boost/container/pmr/monotonic_buffer_resource.hpp>">boost/container/pmr/monotonic_buffer_resource.hpp</a>>
</span>
<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>
<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>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// <a class="link" href="monotonic_buffer_resource.html#boost.container.pmr.monotonic_buffer_resourceconstruct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="monotonic_buffer_resource.html#idp46213648-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>
<span class="keyword">explicit</span> <a class="link" href="monotonic_buffer_resource.html#idp46220672-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>
<a class="link" href="monotonic_buffer_resource.html#idp46229440-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>
<a class="link" href="monotonic_buffer_resource.html#idp46239200-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
<a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a>
<a class="link" href="monotonic_buffer_resource.html#idp46240912-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
<a class="link" href="monotonic_buffer_resource.html#idp46243056-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>
<span class="comment">// <a class="link" href="monotonic_buffer_resource.html#idp46192896-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="monotonic_buffer_resource.html#idp46193456-bb"><span class="identifier">release</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<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#idp46196608-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>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp46199008-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">&</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp46203456-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>
<span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="monotonic_buffer_resource.html#idp46207440-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>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="monotonic_buffer_resource.html#idp46210448-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>
<span class="comment">// <a class="link" href="monotonic_buffer_resource.html#idp46244768-bb">protected member functions</a></span>
<span class="keyword">virtual</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="monotonic_buffer_resource.html#idp46245344-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>
<span class="keyword">virtual</span> <span class="keyword">void</span> <a class="link" href="monotonic_buffer_resource.html#idp46256768-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>
<span class="keyword">virtual</span> <span class="keyword">bool</span> <a class="link" href="monotonic_buffer_resource.html#idp46262960-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">&</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="comment">// <a class="link" href="monotonic_buffer_resource.html#boost.container.pmr.monotonic_buffer_resourcepublic-data-members">public data members</a></span>
<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>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp288510256"></a><h2>Description</h2>
<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>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<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>
<li class="listitem"><p>The program can supply an initial buffer, which the allocator uses to satisfy memory requests.</p></li>
<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>
<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>
<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>
</ul></div>
<p>
</p>
<div class="refsect2">
<a name="idp288515376"></a><h3>
<a name="boost.container.pmr.monotonic_buffer_resourceconstruct-copy-destruct"></a><code class="computeroutput">monotonic_buffer_resource</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp46213648-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>
<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>
<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>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp46220672-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>
<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>
<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>
<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>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp46229440-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>
<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>
<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>
<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>
</li>
<li class="listitem"><pre class="literallayout"><a name="idp46239200-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="monotonic_buffer_resource.html" title="Class monotonic_buffer_resource">monotonic_buffer_resource</a>
<a name="idp46240912-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><a name="idp46243056-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>
<p><span class="bold"><strong>Effects</strong></span>: Calls <code class="computeroutput">this->release()</code>. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp288592160"></a><h3>
<a name="idp46192896-bb"></a><code class="computeroutput">monotonic_buffer_resource</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp46193456-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>
<p><span class="bold"><strong>Effects</strong></span>: <code class="computeroutput">upstream_resource()->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>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a> <span class="special">*</span> <a name="idp46196608-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>
<p><span class="bold"><strong>Returns</strong></span>: The value of the internal resource. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp46199008-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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">&</span> wasted_due_to_alignment<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<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>
<p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp46203456-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>
<p><span class="bold"><strong>Returns</strong></span>: The number of bytes of storage available for the specified alignment.</p>
<p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <a name="idp46207440-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>
<p><span class="bold"><strong>Returns</strong></span>: The number of bytes of storage available for the specified alignment.</p>
<p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp46210448-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>
<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>
<p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp288651376"></a><h3>
<a name="idp46244768-bb"></a><code class="computeroutput">monotonic_buffer_resource</code> protected member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">void</span> <span class="special">*</span> <a name="idp46245344-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>
<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>
<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()->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>
<p><span class="bold"><strong>Throws</strong></span>: Nothing unless <code class="computeroutput">upstream_resource()->allocate()</code> throws. </p>
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<pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">void</span>
<a name="idp46256768-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>
<p><span class="bold"><strong>Effects</strong></span>: None</p>
<p><span class="bold"><strong>Throws</strong></span>: Nothing</p>
<p><span class="bold"><strong>Remarks</strong></span>: Memory used by this resource increases monotonically until its destruction. </p>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">virtual</span> <span class="keyword">bool</span> <a name="idp46262960-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">&</span> other<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Returns</strong></span>: <code class="computeroutput">this == dynamic_cast<const monotonic_buffer_resource*>(&other)</code>. </p>
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<div class="refsect2">
<a name="idp288700736"></a><h3>
<a name="boost.container.pmr.monotonic_buffer_resourcepublic-data-members"></a><code class="computeroutput">monotonic_buffer_resource</code>
public
public data members</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<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>
<p>The number of bytes that will be requested by the default in the first call to the upstream allocator</p>
<p><span class="bold"><strong>Note</strong></span>: Non-standard extension. </p>
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