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<li class="navelem"><a class="el" href="namespacegrpc.html">grpc</a></li><li class="navelem"><a class="el" href="classgrpc_1_1_completion_queue.html">CompletionQueue</a></li>  </ul>
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<p>A thin wrapper around <a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> (see src/core/lib/surface/completion_queue.h).  
 <a href="classgrpc_1_1_completion_queue.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="impl_2codegen_2completion__queue_8h_source.html">completion_queue.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a6227657fb2f29291f80cd092f9baf572"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a> { <a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572a5d05c1c970154dad10e5f648890c215b">SHUTDOWN</a>, 
<a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572a5d8344849fb99341b7edaa9da7b42c08">GOT_EVENT</a>, 
<a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572ae88eecb45f91413b425511ee973e2e04">TIMEOUT</a>
 }</td></tr>
<tr class="memdesc:a6227657fb2f29291f80cd092f9baf572"><td class="mdescLeft">&#160;</td><td class="mdescRight">Tri-state return for AsyncNext: SHUTDOWN, GOT_EVENT, TIMEOUT.  <a href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">More...</a><br/></td></tr>
<tr class="separator:a6227657fb2f29291f80cd092f9baf572"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aea987a15a475923e949934e481fe3566"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#aea987a15a475923e949934e481fe3566">CompletionQueue</a> ()</td></tr>
<tr class="memdesc:aea987a15a475923e949934e481fe3566"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default constructor.  <a href="#aea987a15a475923e949934e481fe3566">More...</a><br/></td></tr>
<tr class="separator:aea987a15a475923e949934e481fe3566"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a081a954044215a7ca8554da4220fb369"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a081a954044215a7ca8554da4220fb369">CompletionQueue</a> (<a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> *take)</td></tr>
<tr class="memdesc:a081a954044215a7ca8554da4220fb369"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wrap <em>take</em>, taking ownership of the instance.  <a href="#a081a954044215a7ca8554da4220fb369">More...</a><br/></td></tr>
<tr class="separator:a081a954044215a7ca8554da4220fb369"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aac07e9da5148c779cac51e1bf948c282"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#aac07e9da5148c779cac51e1bf948c282">~CompletionQueue</a> ()</td></tr>
<tr class="memdesc:aac07e9da5148c779cac51e1bf948c282"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. Destroys the owned wrapped completion queue / instance.  <a href="#aac07e9da5148c779cac51e1bf948c282">More...</a><br/></td></tr>
<tr class="separator:aac07e9da5148c779cac51e1bf948c282"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af935df99ccd14bcfb674e89f0c077a8c"><td class="memTemplParams" colspan="2">template&lt;typename T , typename F &gt; </td></tr>
<tr class="memitem:af935df99ccd14bcfb674e89f0c077a8c"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#af935df99ccd14bcfb674e89f0c077a8c">DoThenAsyncNext</a> (F &amp;&amp;f, void **tag, bool *ok, const T &amp;deadline)</td></tr>
<tr class="memdesc:af935df99ccd14bcfb674e89f0c077a8c"><td class="mdescLeft">&#160;</td><td class="mdescRight">EXPERIMENTAL First executes <em>F</em>, then reads from the queue, blocking up to <em>deadline</em> (or the queue's shutdown).  <a href="#af935df99ccd14bcfb674e89f0c077a8c">More...</a><br/></td></tr>
<tr class="separator:af935df99ccd14bcfb674e89f0c077a8c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a290ddf3d96e6d1d5886580e60b0602b4">AsyncNext</a> (void **tag, bool *ok, const T &amp;deadline)</td></tr>
<tr class="memdesc:a290ddf3d96e6d1d5886580e60b0602b4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read from the queue, blocking up to <em>deadline</em> (or the queue's shutdown).  <a href="#a290ddf3d96e6d1d5886580e60b0602b4">More...</a><br/></td></tr>
<tr class="separator:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a86d9810ced694e50f7987ac90b9f8c1a"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a86d9810ced694e50f7987ac90b9f8c1a">Next</a> (void **tag, bool *ok)</td></tr>
<tr class="memdesc:a86d9810ced694e50f7987ac90b9f8c1a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read from the queue, blocking until an event is available or the queue is shutting down.  <a href="#a86d9810ced694e50f7987ac90b9f8c1a">More...</a><br/></td></tr>
<tr class="separator:a86d9810ced694e50f7987ac90b9f8c1a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a40efddadd9073386fbcb4f46e8325670"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a40efddadd9073386fbcb4f46e8325670">Shutdown</a> ()</td></tr>
<tr class="memdesc:a40efddadd9073386fbcb4f46e8325670"><td class="mdescLeft">&#160;</td><td class="mdescRight">Request the shutdown of the queue.  <a href="#a40efddadd9073386fbcb4f46e8325670">More...</a><br/></td></tr>
<tr class="separator:a40efddadd9073386fbcb4f46e8325670"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a999c317e716d1e74aca2eb050912302b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a999c317e716d1e74aca2eb050912302b">cq</a> ()</td></tr>
<tr class="memdesc:a999c317e716d1e74aca2eb050912302b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a <em>raw</em> pointer to the underlying <em>grpc_completion_queue</em> instance.  <a href="#a999c317e716d1e74aca2eb050912302b">More...</a><br/></td></tr>
<tr class="separator:a999c317e716d1e74aca2eb050912302b"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:abf1d4810de32ca2cc2c14c591b41d2cd"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#abf1d4810de32ca2cc2c14c591b41d2cd">CompletionQueue</a> (const <a class="el" href="structgrpc__completion__queue__attributes.html">grpc_completion_queue_attributes</a> &amp;attributes)</td></tr>
<tr class="memdesc:abf1d4810de32ca2cc2c14c591b41d2cd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Private constructor of <a class="el" href="classgrpc_1_1_completion_queue.html" title="A thin wrapper around grpc_completion_queue (see src/core/lib/surface/completion_queue.h). ">CompletionQueue</a> only visible to friend classes.  <a href="#abf1d4810de32ca2cc2c14c591b41d2cd">More...</a><br/></td></tr>
<tr class="separator:abf1d4810de32ca2cc2c14c591b41d2cd"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:ade499098cc91745c1c87147d7a7fb7bf"><td class="memTemplParams" colspan="2">template&lt;class R &gt; </td></tr>
<tr class="memitem:ade499098cc91745c1c87147d7a7fb7bf"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#ade499098cc91745c1c87147d7a7fb7bf">::grpc::ClientReader</a></td></tr>
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<tr class="memitem:a4498fada67d531d99a8642f47d746544"><td class="memTemplParams" colspan="2">template&lt;class W &gt; </td></tr>
<tr class="memitem:a4498fada67d531d99a8642f47d746544"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a4498fada67d531d99a8642f47d746544">::grpc::ClientWriter</a></td></tr>
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<tr class="memitem:a6d5659aa24edba057895be774e2752ec"><td class="memTemplParams" colspan="2">template&lt;class W , class R &gt; </td></tr>
<tr class="memitem:a6d5659aa24edba057895be774e2752ec"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a6d5659aa24edba057895be774e2752ec">::grpc::ClientReaderWriter</a></td></tr>
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<tr class="memitem:a4f20e2d049342ae00242bbc8021a44bd"><td class="memTemplParams" colspan="2">template&lt;class R &gt; </td></tr>
<tr class="memitem:a4f20e2d049342ae00242bbc8021a44bd"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a4f20e2d049342ae00242bbc8021a44bd">::grpc::ServerReader</a></td></tr>
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<tr class="memitem:a2f2dfa831a62c43ad5647a45080488e3"><td class="memTemplParams" colspan="2">template&lt;class W &gt; </td></tr>
<tr class="memitem:a2f2dfa831a62c43ad5647a45080488e3"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a2f2dfa831a62c43ad5647a45080488e3">::grpc::ServerWriter</a></td></tr>
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<tr class="memitem:a81fd5fb92dd22dced55726c389f3ea29"><td class="memTemplParams" colspan="2">template&lt;class W , class R &gt; </td></tr>
<tr class="memitem:a81fd5fb92dd22dced55726c389f3ea29"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a81fd5fb92dd22dced55726c389f3ea29">::grpc::internal::ServerReaderWriterBody</a></td></tr>
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<tr class="memitem:ab4e0fda6a3be8543f0d9f79f297533e9"><td class="memTemplParams" colspan="2">template&lt;class ServiceType , class RequestType , class ResponseType &gt; </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A thin wrapper around <a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> (see src/core/lib/surface/completion_queue.h). </p>
<p>See <a class="el" href="md_doc_cpp_perf_notes.html">C++ Performance Notes</a> for notes on best practices for high performance servers. </p>
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          <td class="memname">enum <a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">grpc::CompletionQueue::NextStatus</a></td>
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<p>Tri-state return for AsyncNext: SHUTDOWN, GOT_EVENT, TIMEOUT. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="a6227657fb2f29291f80cd092f9baf572a5d05c1c970154dad10e5f648890c215b"></a>SHUTDOWN</em>&#160;</td><td class="fielddoc">
<p>The completion queue has been shutdown. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a6227657fb2f29291f80cd092f9baf572a5d8344849fb99341b7edaa9da7b42c08"></a>GOT_EVENT</em>&#160;</td><td class="fielddoc">
<p>Got a new event; <em>tag</em> will be filled in with its associated value; <em>ok</em> indicating its success. </p>
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<p>deadline was reached. </p>
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<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<p>Default constructor. </p>
<p>Implicitly creates a <em>grpc_completion_queue</em> instance. </p>

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<p>Wrap <em>take</em>, taking ownership of the instance. </p>
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<p>Destructor. Destroys the owned wrapped completion queue / instance. </p>

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<p>Private constructor of <a class="el" href="classgrpc_1_1_completion_queue.html" title="A thin wrapper around grpc_completion_queue (see src/core/lib/surface/completion_queue.h). ">CompletionQueue</a> only visible to friend classes. </p>

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<h2 class="groupheader">Member Function Documentation</h2>
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<p>Read from the queue, blocking up to <em>deadline</em> (or the queue's shutdown). </p>
<p>Both <em>tag</em> and <em>ok</em> are updated upon success (if an event is available within the <em>deadline</em>). A <em>tag</em> points to an arbitrary location usually employed to uniquely identify an event.</p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">tag[out]</td><td>Upon sucess, updated to point to the event's tag. </td></tr>
    <tr><td class="paramname">ok[out]</td><td>Upon sucess, true if read a regular event, false otherwise. </td></tr>
    <tr><td class="paramname">deadline[in]</td><td>How long to block in wait for an event.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>The type of event read. </dd></dl>

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          <td class="memname"><a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a>* grpc::CompletionQueue::cq </td>
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<p>Returns a <em>raw</em> pointer to the underlying <em>grpc_completion_queue</em> instance. </p>
<dl class="section warning"><dt>Warning</dt><dd>Remember that the returned instance is owned. No transfer of owership is performed. </dd></dl>

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          <td class="memname"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a> grpc::CompletionQueue::DoThenAsyncNext </td>
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<p>EXPERIMENTAL First executes <em>F</em>, then reads from the queue, blocking up to <em>deadline</em> (or the queue's shutdown). </p>
<p>Both <em>tag</em> and <em>ok</em> are updated upon success (if an event is available within the <em>deadline</em>). A <em>tag</em> points to an arbitrary location usually employed to uniquely identify an event.</p>
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    <tr><td class="paramname">tag[out]</td><td>Upon sucess, updated to point to the event's tag. </td></tr>
    <tr><td class="paramname">ok[out]</td><td>Upon sucess, true if read a regular event, false otherwise. </td></tr>
    <tr><td class="paramname">deadline[in]</td><td>How long to block in wait for an event.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>The type of event read. </dd></dl>

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<p>Read from the queue, blocking until an event is available or the queue is shutting down. </p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">tag[out]</td><td>Updated to point to the read event's tag. </td></tr>
    <tr><td class="paramname">ok[out]</td><td>true if read a regular event, false otherwise.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if read a regular event, false if the queue is shutting down. </dd></dl>

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<p>Request the shutdown of the queue. </p>
<dl class="section warning"><dt>Warning</dt><dd>This method must be called at some point if this completion queue is accessed with Next or AsyncNext. Once invoked, <em>Next</em> will start to return false and <em>AsyncNext</em> will return <em>NextStatus::SHUTDOWN</em>. Only once either one of these methods does that (that is, once the queue has been <em>drained</em>) can an instance of this class be destroyed. Also note that applications must ensure that no work is enqueued on this completion queue after this method is called. </dd></dl>

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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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template&lt;class ServiceType , class RequestType , class ResponseType &gt; </div>
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        <tr>
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template&lt;class Streamer , bool WriteNeeded&gt; </div>
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          <td class="memname">friend class ::<a class="el" href="classgrpc_1_1internal_1_1_templated_bidi_streaming_handler.html">grpc::internal::TemplatedBidiStreamingHandler</a></td>
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<table class="mlabels">
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<table class="mlabels">
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          <td class="memname">friend class ::<a class="el" href="classgrpc_1_1_server.html">grpc::Server</a></td>
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<span class="mlabels"><span class="mlabel">friend</span></span>  </td>
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<table class="mlabels">
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  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">friend</span></span>  </td>
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<table class="mlabels">
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          <td class="memname">friend class ::<a class="el" href="classgrpc_1_1_server_interface.html">grpc::ServerInterface</a></td>
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<span class="mlabels"><span class="mlabel">friend</span></span>  </td>
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</div>
<a class="anchor" id="a4f20e2d049342ae00242bbc8021a44bd"></a>
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template&lt;class R &gt; </div>
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        <tr>
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<span class="mlabels"><span class="mlabel">friend</span></span>  </td>
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</div><div class="memdoc">

</div>
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<a class="anchor" id="a2f2dfa831a62c43ad5647a45080488e3"></a>
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<div class="memproto">
<div class="memtemplate">
template&lt;class W &gt; </div>
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  <td class="mlabels-left">
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        <tr>
          <td class="memname">friend class ::<a class="el" href="classgrpc_1_1_server_writer.html">grpc::ServerWriter</a></td>
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<span class="mlabels"><span class="mlabel">friend</span></span>  </td>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/grpc++/impl/codegen/<a class="el" href="impl_2codegen_2completion__queue_8h_source.html">completion_queue.h</a></li>
</ul>
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