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<div class="refentry">
<a name="boost.lockfree.spsc_queue"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template spsc_queue</span></h2>
<p>boost::lockfree::spsc_queue</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="../../lockfree/reference.html#header.boost.lockfree.spsc_queue_hpp" title="Header <boost/lockfree/spsc_queue.hpp>">boost/lockfree/spsc_queue.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A0<span class="special">,</span> <span class="keyword">typename</span> A1<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</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.lockfree.spsc_queue.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">implementation_defined</span><span class="special">::</span><span class="identifier">allocator</span> <a name="boost.lockfree.spsc_queue.allocator"></a><span class="identifier">allocator</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">implementation_defined</span><span class="special">::</span><span class="identifier">size_type</span> <a name="boost.lockfree.spsc_queue.size_type"></a><span class="identifier">size_type</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> T<span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> Options<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="spsc_queue/implementation_defined.html" title="Struct template implementation_defined">implementation_defined</a> <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">allocator_arg</span> <a class="link" href="spsc_queue/implementation_defined.html#boost.lockfree.spsc_queue.implementation_defined.allocator"><span class="identifier">allocator</span></a><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 class="link" href="spsc_queue/implementation_defined.html#boost.lockfree.spsc_queue.implementation_defined.size_type"><span class="identifier">size_type</span></a><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="spsc_queue.html#boost.lockfree.spsc_queueconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_4-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_5-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_6-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">allocator</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_7-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_8-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span>
<a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_9-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">allocator_arg</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13-bb">public member functions</a></span>
<span class="keyword">bool</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_1-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_2-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span>
<a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_3-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">U</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_4-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_5-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">(</span><span class="special">&</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ConstIterator<span class="special">></span>
<span class="identifier">ConstIterator</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_6-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">ConstIterator</span><span class="special">,</span> <span class="identifier">ConstIterator</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_7-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_8-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">T</span><span class="special">(</span><span class="special">&</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../OutputIterator.html" title="Concept OutputIterator">OutputIterator</a><span class="special">></span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">disable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span>
<a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_9-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">OutputIterator</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_10-bb"><span class="identifier">consume_one</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_11-bb"><span class="identifier">consume_one</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_12-bb"><span class="identifier">consume_all</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_13-bb"><span class="identifier">consume_all</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_14-bb"><span class="identifier">read_available</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_15-bb"><span class="identifier">write_available</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_16-bb"><span class="identifier">front</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">T</span> <span class="special">&</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_17-bb"><span class="identifier">front</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="spsc_queue.html#id-1_3_23_6_4_1_1_1_13_18-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.23.6.4.3.4"></a><h2>Description</h2>
<p>The <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> class provides a single-writer/single-reader fifo queue, pushing and popping is wait-free.</p>
<p><span class="bold"><strong>Policies:</strong></span> </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p><code class="computeroutput">boost::lockfree::capacity<></code>, optional <br>
If this template argument is passed to the options, the size of the ringbuffer is set at compile-time.</p></li>
<li class="listitem"><p><code class="computeroutput">boost::lockfree::allocator<></code>, defaults to <code class="computeroutput"><a class="link" href="allocator.html" title="Struct template allocator">boost::lockfree::allocator</a><std::allocator<T>></code> <br>
Specifies the allocator that is used to allocate the ringbuffer. This option is only valid, if the ringbuffer is configured to be sized at run-time</p></li>
</ul></div>
<p>
</p>
<p><span class="bold"><strong>Requirements:</strong></span> </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>T must have a default constructor</p></li>
<li class="listitem"><p>T must be copyable </p></li>
</ul></div>
<p>
</p>
<div class="refsect2">
<a name="id-1.3.23.6.4.3.4.5"></a><h3>
<a name="boost.lockfree.spsc_queueconstruct-copy-destruct"></a><code class="computeroutput">spsc_queue</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_23_6_4_1_1_1_4-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code></p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> must be configured to be sized at compile-time </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">explicit</span> <a name="id-1_3_23_6_4_1_1_1_5-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_23_6_4_1_1_1_6-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">allocator</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_23_6_4_1_1_1_7-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code> for element_count elements</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> must be configured to be sized at run-time </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="id-1_3_23_6_4_1_1_1_8-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> alloc<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="id-1_3_23_6_4_1_1_1_9-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">,</span> <span class="identifier">allocator_arg</span> <span class="keyword">const</span> <span class="special">&</span> alloc<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.23.6.4.3.4.6"></a><h3>
<a name="id-1_3_23_6_4_1_1_1_13-bb"></a><code class="computeroutput">spsc_queue</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_23_6_4_1_1_1_13_1-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> t<span class="special">)</span><span class="special">;</span></pre>
<p>Pushes object t to the ringbuffer.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p>object will be pushed to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a>, unless it is full. </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>true, if the push operation is successful.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_23_6_4_1_1_1_13_2-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Pops one object from ringbuffer.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p>if ringbuffer is not empty, object will be discarded. </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>true, if the pop operation is successful, false if ringbuffer was empty.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span>
<a name="id-1_3_23_6_4_1_1_1_13_3-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&</span> ret<span class="special">)</span><span class="special">;</span></pre>
<p>Pops one object from ringbuffer.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p>if ringbuffer is not empty, object will be copied to ret. </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>true, if the pop operation is successful, false if ringbuffer was empty.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_4-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">*</span> t<span class="special">,</span> <span class="identifier">size_type</span> size<span class="special">)</span><span class="special">;</span></pre>
<p>Pushes as many objects from the array t as there is space.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of pushed items</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_5-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">(</span><span class="special">&</span><span class="special">)</span> t<span class="special">)</span><span class="special">;</span></pre>
<p>Pushes as many objects from the array t as there is space available.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of pushed items</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ConstIterator<span class="special">></span>
<span class="identifier">ConstIterator</span> <a name="id-1_3_23_6_4_1_1_1_13_6-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">ConstIterator</span> begin<span class="special">,</span> <span class="identifier">ConstIterator</span> end<span class="special">)</span><span class="special">;</span></pre>
<p>Pushes as many objects from the range [begin, end) as there is space .</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>iterator to the first element, which has not been pushed</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_7-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span> ret<span class="special">,</span> <span class="identifier">size_type</span> size<span class="special">)</span><span class="special">;</span></pre>
<p>Pops a maximum of size objects from ringbuffer.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of popped items</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_8-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">T</span><span class="special">(</span><span class="special">&</span><span class="special">)</span> ret<span class="special">)</span><span class="special">;</span></pre>
<p>Pops a maximum of size objects from <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code>.</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of popped items</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../OutputIterator.html" title="Concept OutputIterator">OutputIterator</a><span class="special">></span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">disable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span>
<a name="id-1_3_23_6_4_1_1_1_13_9-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">OutputIterator</span> it<span class="special">)</span><span class="special">;</span></pre>
<p>Pops objects to the output iterator it</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of popped items</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a name="id-1_3_23_6_4_1_1_1_13_10-bb"></a><span class="identifier">consume_one</span><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>consumes one element via a functor</p>
<p>pops one element from the queue and applies the functor on this object</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>true, if one element was consumed</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a name="id-1_3_23_6_4_1_1_1_13_11-bb"></a><span class="identifier">consume_one</span><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>consumes one element via a functor</p>
<p>pops one element from the queue and applies the functor on this object</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>true, if one element was consumed</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_12-bb"></a><span class="identifier">consume_all</span><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>consumes all elements via a functor</p>
<p>sequentially pops all elements from the queue and applies the functor on each object</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of elements that are consumed</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_13-bb"></a><span class="identifier">consume_all</span><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>consumes all elements via a functor</p>
<p>sequentially pops all elements from the queue and applies the functor on each object</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
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<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of elements that are consumed</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_14-bb"></a><span class="identifier">read_available</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>get number of elements that are available for read</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free, should only be called from the consumer thread </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>number of available elements that can be popped from the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="id-1_3_23_6_4_1_1_1_13_15-bb"></a><span class="identifier">write_available</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>get write space to write elements</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free, should only be called from the producer thread </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>number of elements that can be pushed to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&</span> <a name="id-1_3_23_6_4_1_1_1_13_16-bb"></a><span class="identifier">front</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>get reference to element in the front of the queue</p>
<p>Availability of front element can be checked using read_available().</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
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<col align="left" valign="top">
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</colgroup>
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<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only a consuming thread is allowed to check front element </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>read_available() > 0. If ringbuffer is empty, it's undefined behaviour to invoke this method. </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>reference to the first element in the queue</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">T</span> <span class="special">&</span> <a name="id-1_3_23_6_4_1_1_1_13_17-bb"></a><span class="identifier">front</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>get reference to element in the front of the queue</p>
<p>Availability of front element can be checked using read_available().</p>
<p>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr>
</table></div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>only a consuming thread is allowed to check front element </p></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>read_available() > 0. If ringbuffer is empty, it's undefined behaviour to invoke this method. </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>reference to the first element in the queue</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_23_6_4_1_1_1_13_18-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span></pre>
<p>reset the ringbuffer</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Not thread-safe </p></td></tr>
</table></div>
<p>
</p>
</li>
</ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2008-2011 Tim
Blechmann<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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>)
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