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<title>tbb::strict_ppl::concurrent_queue&lt; T, A &gt; Class Template Reference</title>
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<a class="el" href="a00428.html">tbb</a>::<b>strict_ppl</b>::<a class="el" href="a00286.html">concurrent_queue</a></div>
<h1>tbb::strict_ppl::concurrent_queue&lt; T, A &gt; Class Template Reference<br>
<small>
[<a class="el" href="a00442.html">Containers</a>]</small>
</h1><!-- doxytag: class="tbb::strict_ppl::concurrent_queue" -->A high-performance thread-safe non-blocking concurrent queue.
<a href="#_details">More...</a>
<p>
<code>#include &lt;concurrent_queue.h&gt;</code>
<p>
<a href="a00035.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="682c3978d5cb0620000994f11c44a476"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::value_type" ref="682c3978d5cb0620000994f11c44a476" args="" -->
typedef T&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#682c3978d5cb0620000994f11c44a476">value_type</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Element type in the queue. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a8d725c50a9834bb7af5b67c0aff92b8"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::reference" ref="a8d725c50a9834bb7af5b67c0aff92b8" args="" -->
typedef T &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#a8d725c50a9834bb7af5b67c0aff92b8">reference</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Reference type. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4d48e7ff93f81636bca2c74f7da34750"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::const_reference" ref="4d48e7ff93f81636bca2c74f7da34750" args="" -->
typedef const T &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#4d48e7ff93f81636bca2c74f7da34750">const_reference</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Const reference type. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8fc30e93f8342a1960357f71e4fe8a2b"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::size_type" ref="8fc30e93f8342a1960357f71e4fe8a2b" args="" -->
typedef size_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#8fc30e93f8342a1960357f71e4fe8a2b">size_type</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Integral type for representing size of the queue. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="068576d16c7e4e05d52f9db7a45b5b65"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::difference_type" ref="068576d16c7e4e05d52f9db7a45b5b65" args="" -->
typedef ptrdiff_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#068576d16c7e4e05d52f9db7a45b5b65">difference_type</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Difference type for iterator. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5a3956341728eaa558d8827063718cac"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::allocator_type" ref="5a3956341728eaa558d8827063718cac" args="" -->
typedef A&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Allocator type. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="9736ac047d6da3363895c7e5b121d0c4"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::iterator" ref="9736ac047d6da3363895c7e5b121d0c4" args="" -->
typedef internal::concurrent_queue_iterator&lt;<br>
<a class="el" href="a00286.html">concurrent_queue</a>, T &gt;&nbsp;</td><td class="memItemRight" valign="bottom"><b>iterator</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="9cd76d19af8c78be1bafc6ca0123ac0d"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::const_iterator" ref="9cd76d19af8c78be1bafc6ca0123ac0d" args="" -->
typedef internal::concurrent_queue_iterator&lt;<br>
<a class="el" href="a00286.html">concurrent_queue</a>, const T &gt;&nbsp;</td><td class="memItemRight" valign="bottom"><b>const_iterator</b></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7c48a05a94a1f4f98fdfadfbef98ecf6"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::concurrent_queue" ref="7c48a05a94a1f4f98fdfadfbef98ecf6" args="(const allocator_type &amp;a=allocator_type())" -->
&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#7c48a05a94a1f4f98fdfadfbef98ecf6">concurrent_queue</a> (const <a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a> &amp;a=<a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a>())</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Construct empty queue. <br></td></tr>
<tr><td class="memTemplParams" nowrap colspan="2"><a class="anchor" name="25209656c84f2f9b030e2f9162713341"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::concurrent_queue" ref="25209656c84f2f9b030e2f9162713341" args="(InputIterator begin, InputIterator end, const allocator_type &amp;a=allocator_type())" -->
template&lt;typename InputIterator&gt; </td></tr>
<tr><td class="memTemplItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a00286.html#25209656c84f2f9b030e2f9162713341">concurrent_queue</a> (InputIterator begin, InputIterator end, const <a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a> &amp;a=<a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a>())</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">[begin,end) constructor <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8a6b98ea11a867db8ac868f0113ca429"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::concurrent_queue" ref="8a6b98ea11a867db8ac868f0113ca429" args="(const concurrent_queue &amp;src, const allocator_type &amp;a=allocator_type())" -->
&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#8a6b98ea11a867db8ac868f0113ca429">concurrent_queue</a> (const <a class="el" href="a00286.html">concurrent_queue</a> &amp;src, const <a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a> &amp;a=<a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a>())</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Copy constructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="830b33753d6b149c366344e29b2edd8c"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::~concurrent_queue" ref="830b33753d6b149c366344e29b2edd8c" args="()" -->
&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#830b33753d6b149c366344e29b2edd8c">~concurrent_queue</a> ()</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Destroy queue. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="73c47563ffcc4c2f6452f25a04ebe2e2"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::push" ref="73c47563ffcc4c2f6452f25a04ebe2e2" args="(const T &amp;source)" -->
void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#73c47563ffcc4c2f6452f25a04ebe2e2">push</a> (const T &amp;source)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Enqueue an item at tail of queue. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#ae31ca0db34ef96ef1e74aa0d28c95f8">try_pop</a> (T &amp;result)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Attempt to dequeue an item from head of queue. <a href="#ae31ca0db34ef96ef1e74aa0d28c95f8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="eaa35a5274606779802e9a669a706260"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::unsafe_size" ref="eaa35a5274606779802e9a669a706260" args="() const " -->
<a class="el" href="a00286.html#8fc30e93f8342a1960357f71e4fe8a2b">size_type</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#eaa35a5274606779802e9a669a706260">unsafe_size</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Return the number of items in the queue; thread unsafe. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f3f6fce0cfa2d581d6f3b47e0613ad64"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::empty" ref="f3f6fce0cfa2d581d6f3b47e0613ad64" args="() const " -->
bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#f3f6fce0cfa2d581d6f3b47e0613ad64">empty</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Equivalent to size()==0. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c32e8e84c0524155133b4aae32d2a827"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::clear" ref="c32e8e84c0524155133b4aae32d2a827" args="()" -->
void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#c32e8e84c0524155133b4aae32d2a827">clear</a> ()</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Clear the queue. not thread-safe. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f034f70caef445fe8abc9113ec926a8d"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::get_allocator" ref="f034f70caef445fe8abc9113ec926a8d" args="() const " -->
<a class="el" href="a00286.html#5a3956341728eaa558d8827063718cac">allocator_type</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00286.html#f034f70caef445fe8abc9113ec926a8d">get_allocator</a> () const </td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Return allocator object. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6297f48808dd7c14e6c2fe81559ca190"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::unsafe_begin" ref="6297f48808dd7c14e6c2fe81559ca190" args="()" -->
iterator&nbsp;</td><td class="memItemRight" valign="bottom"><b>unsafe_begin</b> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1569f70e70521fe71944a5b0138c6ef5"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::unsafe_end" ref="1569f70e70521fe71944a5b0138c6ef5" args="()" -->
iterator&nbsp;</td><td class="memItemRight" valign="bottom"><b>unsafe_end</b> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e3e6746f7b6ecfbc16f781665ac51112"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::unsafe_begin" ref="e3e6746f7b6ecfbc16f781665ac51112" args="() const " -->
const_iterator&nbsp;</td><td class="memItemRight" valign="bottom"><b>unsafe_begin</b> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="83bf90849c08f44d25dd7a3b207a8956"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::unsafe_end" ref="83bf90849c08f44d25dd7a3b207a8956" args="() const " -->
const_iterator&nbsp;</td><td class="memItemRight" valign="bottom"><b>unsafe_end</b> () const </td></tr>
<tr><td colspan="2"><br><h2>Friends</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="05bffad9626d51abbd4bb82ae2a1cceb"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::internal::concurrent_queue_iterator" ref="05bffad9626d51abbd4bb82ae2a1cceb" args="" -->
class&nbsp;</td><td class="memItemRight" valign="bottom"><b>internal::concurrent_queue_iterator</b></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h3>template&lt;typename T, typename A = cache_aligned_allocator&lt;T&gt;&gt;<br>
class tbb::strict_ppl::concurrent_queue&lt; T, A &gt;</h3>
A high-performance thread-safe non-blocking concurrent queue.
<p>
Multiple threads may each push and pop concurrently. Assignment construction is not allowed.
<p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="ae31ca0db34ef96ef1e74aa0d28c95f8"></a><!-- doxytag: member="tbb::strict_ppl::concurrent_queue::try_pop" ref="ae31ca0db34ef96ef1e74aa0d28c95f8" args="(T &amp;result)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename T, typename A = cache_aligned_allocator&lt;T&gt;&gt; </div>
<table class="memname">
<tr>
<td class="memname">bool <a class="el" href="a00286.html">tbb::strict_ppl::concurrent_queue</a>&lt; T, A &gt;::try_pop </td>
<td>(</td>
<td class="paramtype">T &amp;&nbsp;</td>
<td class="paramname"> <em>result</em> </td>
<td>&nbsp;)&nbsp;</td>
<td width="100%"><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Attempt to dequeue an item from head of queue.
<p>
Does not wait for item to become available. Returns true if successful; false otherwise.
</div>
</div><p>
<hr>The documentation for this class was generated from the following file:<ul>
<li>concurrent_queue.h</ul>
<hr>
<p></p>
Copyright &copy; 2005-2013 Intel Corporation. All Rights Reserved.
<p></p>
Intel, Pentium, Intel Xeon, Itanium, Intel XScale and VTune are
registered trademarks or trademarks of Intel Corporation or its
subsidiaries in the United States and other countries.
<p></p>
* Other names and brands may be claimed as the property of others.