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 <a class="el" href="a00267.html">tbb</a>::<a class="el" href="a00155.html">concurrent_bounded_queue</a></div>
 <h1>tbb::concurrent_bounded_queue&lt; T, A &gt; Class Template Reference<br>
 <small>
 [<a class="el" href="a00275.html">Containers</a>]</small>
 </h1><!-- doxytag: class="tbb::concurrent_bounded_queue" -->A high-performance thread-safe blocking concurrent bounded queue.
 <a href="#_details">More...</a>
 <p>
 <code>#include &lt;<a class="el" href="a00335.html">concurrent_queue.h</a>&gt;</code>
 <p>
 <p>Inheritance diagram for tbb::concurrent_bounded_queue&lt; T, A &gt;:
 <p><center><img src="a00155.png" usemap="#tbb::concurrent_bounded_queue< T, A >_map" border="0" alt=""></center>
 <map name="tbb::concurrent_bounded_queue< T, A >_map">
 <area href="a00161.html" alt="tbb::deprecated::concurrent_queue< T, A >" shape="rect" coords="0,56,257,80">
 </map>
 <a href="a00019.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="98245517a931e5893f6601e66c51fc75"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::value_type" ref="98245517a931e5893f6601e66c51fc75" args="" -->
 typedef T&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#98245517a931e5893f6601e66c51fc75">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="2e2726fccf6d975dc1071608cc0bbf90"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::allocator_type" ref="2e2726fccf6d975dc1071608cc0bbf90" args="" -->
 typedef A&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">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="dcd44ca6a88c0dc7a847a47a10811f0c"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::reference" ref="dcd44ca6a88c0dc7a847a47a10811f0c" args="" -->
 typedef T &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#dcd44ca6a88c0dc7a847a47a10811f0c">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="796713d0b9ba93a4721cbe13e4474068"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::const_reference" ref="796713d0b9ba93a4721cbe13e4474068" args="" -->
 typedef const T &amp;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#796713d0b9ba93a4721cbe13e4474068">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">typedef std::ptrdiff_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a></td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Integral type for representing size of the queue.  <a href="#a80e4c11dbb324e4b92a24a77bbcde68"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4b45c91297e69515d83d5eef85ae1f49"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::difference_type" ref="4b45c91297e69515d83d5eef85ae1f49" args="" -->
 typedef std::ptrdiff_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#4b45c91297e69515d83d5eef85ae1f49">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="aeea2ad38b7e7fc2866f063dfed24c52"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::iterator" ref="aeea2ad38b7e7fc2866f063dfed24c52" args="" -->
 typedef internal::concurrent_queue_iterator&lt;<br>
  <a class="el" href="a00155.html">concurrent_bounded_queue</a>,<br>
  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="0edd1a90e6ffa503bac1c4027116dbff"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::const_iterator" ref="0edd1a90e6ffa503bac1c4027116dbff" args="" -->
 typedef internal::concurrent_queue_iterator&lt;<br>
  <a class="el" href="a00155.html">concurrent_bounded_queue</a>,<br>
  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="e3525226732963ff0f13e89d8e6dab5b"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::concurrent_bounded_queue" ref="e3525226732963ff0f13e89d8e6dab5b" args="(const allocator_type &amp;a=allocator_type())" -->
 &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#e3525226732963ff0f13e89d8e6dab5b">concurrent_bounded_queue</a> (const <a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a> &amp;a=<a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a>())</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Construct empty queue. <br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7b7fb414d2eaa8a7f5d68fc4cd63ac50"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::concurrent_bounded_queue" ref="7b7fb414d2eaa8a7f5d68fc4cd63ac50" args="(const concurrent_bounded_queue &amp;src, const allocator_type &amp;a=allocator_type())" -->
 &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#7b7fb414d2eaa8a7f5d68fc4cd63ac50">concurrent_bounded_queue</a> (const <a class="el" href="a00155.html">concurrent_bounded_queue</a> &amp;src, const <a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a> &amp;a=<a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a>())</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Copy constructor. <br></td></tr>
 <tr><td class="memTemplParams" nowrap colspan="2"><a class="anchor" name="a5e04dcd7db9fd9b583b4e7df832246a"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::concurrent_bounded_queue" ref="a5e04dcd7db9fd9b583b4e7df832246a" 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="a00155.html#a5e04dcd7db9fd9b583b4e7df832246a">concurrent_bounded_queue</a> (InputIterator begin, InputIterator end, const <a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a> &amp;a=<a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">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="acaf5b510dc0dfc7780b8c956cf773cf"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::~concurrent_bounded_queue" ref="acaf5b510dc0dfc7780b8c956cf773cf" args="()" -->
 &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#acaf5b510dc0dfc7780b8c956cf773cf">~concurrent_bounded_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="ceb08c743b11ba88c878e73fff8af20b"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::push" ref="ceb08c743b11ba88c878e73fff8af20b" args="(const T &amp;source)" -->
 void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#ceb08c743b11ba88c878e73fff8af20b">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">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#41f4c6bd7a82ab070e840bbf81b0b123">pop</a> (T &amp;destination)</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Dequeue item from head of queue.  <a href="#41f4c6bd7a82ab070e840bbf81b0b123"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top">bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#2bd6232531279fb3ccbd296bea23066b">try_push</a> (const T &amp;source)</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Enqueue an item at tail of queue if queue is not already full.  <a href="#2bd6232531279fb3ccbd296bea23066b"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top">bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#0ca487019bbb00a196442aff78a1e4f7">try_pop</a> (T &amp;destination)</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Attempt to dequeue an item from head of queue.  <a href="#0ca487019bbb00a196442aff78a1e4f7"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#7dc14d1a579a4cccda9f857585e1768d">size</a> () const </td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Return number of pushes minus number of pops.  <a href="#7dc14d1a579a4cccda9f857585e1768d"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f64924f2ee9225c368a270fc3c394db9"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::empty" ref="f64924f2ee9225c368a270fc3c394db9" args="() const " -->
 bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#f64924f2ee9225c368a270fc3c394db9">empty</a> () const </td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Equivalent to <a class="el" href="a00155.html#7dc14d1a579a4cccda9f857585e1768d">size()</a>&lt;=0. <br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b2888b3e4e837d7e03f2c731963a402b"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::capacity" ref="b2888b3e4e837d7e03f2c731963a402b" args="() const " -->
 <a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#b2888b3e4e837d7e03f2c731963a402b">capacity</a> () const </td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Maximum number of allowed elements. <br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#f3c6c934f85fd02aedbc83a16943193b">set_capacity</a> (<a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a> new_capacity)</td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the capacity.  <a href="#f3c6c934f85fd02aedbc83a16943193b"></a><br></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="415eb87e53b1c6a266de06ecbc490d16"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::get_allocator" ref="415eb87e53b1c6a266de06ecbc490d16" args="() const " -->
 <a class="el" href="a00155.html#2e2726fccf6d975dc1071608cc0bbf90">allocator_type</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#415eb87e53b1c6a266de06ecbc490d16">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="90b31e2954c6e4596c7900435a5f4bc1"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::clear" ref="90b31e2954c6e4596c7900435a5f4bc1" args="()" -->
 void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00155.html#90b31e2954c6e4596c7900435a5f4bc1">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="5a2637188e104503ac2c0dff633014e8"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::unsafe_begin" ref="5a2637188e104503ac2c0dff633014e8" 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="c7267334ef11087c76c810abb9d5cbc2"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::unsafe_end" ref="c7267334ef11087c76c810abb9d5cbc2" 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="8be757841d0bbf7744508aaf6a141d08"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::unsafe_begin" ref="8be757841d0bbf7744508aaf6a141d08" 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="3aac91d288bf227d9d06717b44ef28f7"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::unsafe_end" ref="3aac91d288bf227d9d06717b44ef28f7" 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::concurrent_bounded_queue::internal::concurrent_queue_iterator" ref="05bffad9626d51abbd4bb82ae2a1cceb" args="" -->
 class&nbsp;</td><td class="memItemRight" valign="bottom"><b>internal::concurrent_queue_iterator</b></td></tr>

 <tr><td colspan="2"><br><h2>Classes</h2></td></tr>
 <tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><b>destroyer</b></td></tr>

 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Class used to ensure exception-safety of method "pop". <br></td></tr>
 </table>
 <hr><a name="_details"></a><h2>Detailed Description</h2>
 <h3>template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt;<br>
  class tbb::concurrent_bounded_queue&lt; T, A &gt;</h3>

 A high-performance thread-safe blocking concurrent bounded queue.
 <p>
 This is the pre-PPL TBB concurrent queue which supports boundedness and blocking semantics. Note that method names agree with the PPL-style concurrent queue. Multiple threads may each push and pop concurrently. Assignment construction is not allowed.
 <p>
 <hr><h2>Member Typedef Documentation</h2>
 <a class="anchor" name="a80e4c11dbb324e4b92a24a77bbcde68"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::size_type" ref="a80e4c11dbb324e4b92a24a77bbcde68" args="" -->
 <div class="memitem">
 <div class="memproto">
 <div class="memtemplate">
 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
       <table class="memname">
         <tr>
           <td class="memname">typedef std::ptrdiff_t <a class="el" href="a00155.html">tbb::concurrent_bounded_queue</a>&lt; T, A &gt;::<a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a>          </td>
         </tr>
       </table>
 </div>
 <div class="memdoc">

 <p>
 Integral type for representing size of the queue.
 <p>
 Notice that the size_type is a signed integral type. This is because the size can be negative if there are pending pops without corresponding pushes.
 </div>
 </div><p>
 <hr><h2>Member Function Documentation</h2>
 <a class="anchor" name="41f4c6bd7a82ab070e840bbf81b0b123"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::pop" ref="41f4c6bd7a82ab070e840bbf81b0b123" args="(T &amp;destination)" -->
 <div class="memitem">
 <div class="memproto">
 <div class="memtemplate">
 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
       <table class="memname">
         <tr>
           <td class="memname">void <a class="el" href="a00155.html">tbb::concurrent_bounded_queue</a>&lt; T, A &gt;::pop           </td>
           <td>(</td>
           <td class="paramtype">T &amp;&nbsp;</td>
           <td class="paramname"> <em>destination</em>          </td>
           <td>&nbsp;)&nbsp;</td>
           <td width="100%"><code> [inline]</code></td>
         </tr>
       </table>
 </div>
 <div class="memdoc">

 <p>
 Dequeue item from head of queue.
 <p>
 Block until an item becomes available, and then dequeue it.
 </div>
 </div><p>
 <a class="anchor" name="f3c6c934f85fd02aedbc83a16943193b"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::set_capacity" ref="f3c6c934f85fd02aedbc83a16943193b" args="(size_type new_capacity)" -->
 <div class="memitem">
 <div class="memproto">
 <div class="memtemplate">
 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
       <table class="memname">
         <tr>
           <td class="memname">void <a class="el" href="a00155.html">tbb::concurrent_bounded_queue</a>&lt; T, A &gt;::set_capacity           </td>
           <td>(</td>
           <td class="paramtype"><a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a>&nbsp;</td>
           <td class="paramname"> <em>new_capacity</em>          </td>
           <td>&nbsp;)&nbsp;</td>
           <td width="100%"><code> [inline]</code></td>
         </tr>
       </table>
 </div>
 <div class="memdoc">

 <p>
 Set the capacity.
 <p>
 Setting the capacity to 0 causes subsequent try_push operations to always fail, and subsequent push operations to block forever.
 </div>
 </div><p>
 <a class="anchor" name="7dc14d1a579a4cccda9f857585e1768d"></a><!-- doxytag: member="tbb::concurrent_bounded_queue::size" ref="7dc14d1a579a4cccda9f857585e1768d" args="() const " -->
 <div class="memitem">
 <div class="memproto">
 <div class="memtemplate">
 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
       <table class="memname">
         <tr>
           <td class="memname"><a class="el" href="a00155.html#a80e4c11dbb324e4b92a24a77bbcde68">size_type</a> <a class="el" href="a00155.html">tbb::concurrent_bounded_queue</a>&lt; T, A &gt;::size           </td>
           <td>(</td>
           <td class="paramname">          </td>
           <td>&nbsp;)&nbsp;</td>
           <td width="100%"> const<code> [inline]</code></td>
         </tr>
       </table>
 </div>
 <div class="memdoc">

 <p>
 Return number of pushes minus number of pops.
 <p>
 Note that the result can be negative if there are pops waiting for the corresponding pushes. The result can also exceed <a class="el" href="a00155.html#b2888b3e4e837d7e03f2c731963a402b">capacity()</a> if there are push operations in flight.
 </div>
 </div><p>
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 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
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 Attempt to dequeue an item from head of queue.
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 Does not wait for item to become available. Returns true if successful; false otherwise.
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 template&lt;typename T, class A = cache_aligned_allocator&lt;T&gt;&gt; </div>
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 Enqueue an item at tail of queue if queue is not already full.
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 Does not wait for queue to become not full. Returns true if item is pushed; false if queue was already full.
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 <hr>The documentation for this class was generated from the following file:<ul>
 <li><a class="el" href="a00335.html">concurrent_queue.h</a></ul>
 <hr>
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