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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_client_reader_writer.html">ClientReaderWriter</a></li>  </ul>
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<a href="#pub-methods">Public Member Functions</a> &#124;
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<p>Synchronous (blocking) client-side API for bi-directional streaming RPCs, where the outgoing message stream coming from the client has messages of type <em>W</em>, and the incoming messages stream coming from the server has messages of type <em>R</em>.  
 <a href="classgrpc_1_1_client_reader_writer.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="grpcpp_2impl_2codegen_2channel__interface_8h_source.html">channel_interface.h</a>&gt;</code></p>
<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:ab6f436ca034fbc2e5e8035e637f7f5fc"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#ab6f436ca034fbc2e5e8035e637f7f5fc">WaitForInitialMetadata</a> () override</td></tr>
<tr class="memdesc:ab6f436ca034fbc2e5e8035e637f7f5fc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Block waiting to read initial metadata from the server.  <a href="#ab6f436ca034fbc2e5e8035e637f7f5fc">More...</a><br /></td></tr>
<tr class="separator:ab6f436ca034fbc2e5e8035e637f7f5fc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a85c3018b87b4110c98b9f7f91adbfcef"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#a85c3018b87b4110c98b9f7f91adbfcef">NextMessageSize</a> (uint32_t *sz) override</td></tr>
<tr class="memdesc:a85c3018b87b4110c98b9f7f91adbfcef"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get an upper bound on the next message size available for reading on this stream.  <a href="#a85c3018b87b4110c98b9f7f91adbfcef">More...</a><br /></td></tr>
<tr class="separator:a85c3018b87b4110c98b9f7f91adbfcef"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa8887778273bea6ad32ffea3a6105699"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#aa8887778273bea6ad32ffea3a6105699">Read</a> (R *msg) override</td></tr>
<tr class="memdesc:aa8887778273bea6ad32ffea3a6105699"><td class="mdescLeft">&#160;</td><td class="mdescRight">See the <em>ReaderInterface.Read</em> method for semantics.  <a href="#aa8887778273bea6ad32ffea3a6105699">More...</a><br /></td></tr>
<tr class="separator:aa8887778273bea6ad32ffea3a6105699"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae30b0e18622f4132b1c7654e24605d53"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#ae30b0e18622f4132b1c7654e24605d53">Write</a> (const W &amp;msg, <a class="el" href="classgrpc_1_1_write_options.html">WriteOptions</a> options) override</td></tr>
<tr class="memdesc:ae30b0e18622f4132b1c7654e24605d53"><td class="mdescLeft">&#160;</td><td class="mdescRight">Block to write <em>msg</em> to the stream with <a class="el" href="classgrpc_1_1_write_options.html" title="Per-message write options. ">WriteOptions</a> <em>options</em>.  <a href="#ae30b0e18622f4132b1c7654e24605d53">More...</a><br /></td></tr>
<tr class="separator:ae30b0e18622f4132b1c7654e24605d53"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a183f35c478b847e939c76cb20c69a359"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#a183f35c478b847e939c76cb20c69a359">WritesDone</a> () override</td></tr>
<tr class="memdesc:a183f35c478b847e939c76cb20c69a359"><td class="mdescLeft">&#160;</td><td class="mdescRight">Half close writing from the client.  <a href="#a183f35c478b847e939c76cb20c69a359">More...</a><br /></td></tr>
<tr class="separator:a183f35c478b847e939c76cb20c69a359"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9fe0acda29ba46726d69cedfdb043c79"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgrpc_1_1_status.html">Status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#a9fe0acda29ba46726d69cedfdb043c79">Finish</a> () override</td></tr>
<tr class="memdesc:a9fe0acda29ba46726d69cedfdb043c79"><td class="mdescLeft">&#160;</td><td class="mdescRight">See the ClientStreamingInterface.Finish method for semantics.  <a href="#a9fe0acda29ba46726d69cedfdb043c79">More...</a><br /></td></tr>
<tr class="separator:a9fe0acda29ba46726d69cedfdb043c79"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classgrpc_1_1internal_1_1_client_streaming_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1internal_1_1_client_streaming_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1internal_1_1_client_streaming_interface.html">grpc::internal::ClientStreamingInterface</a></td></tr>
<tr class="memitem:ab1a7a2664187d88d0354b69138db7eb1 inherit pub_methods_classgrpc_1_1internal_1_1_client_streaming_interface"><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1internal_1_1_client_streaming_interface.html#ab1a7a2664187d88d0354b69138db7eb1">~ClientStreamingInterface</a> ()</td></tr>
<tr class="separator:ab1a7a2664187d88d0354b69138db7eb1 inherit pub_methods_classgrpc_1_1internal_1_1_client_streaming_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1internal_1_1_writer_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1internal_1_1_writer_interface.html">grpc::internal::WriterInterface&lt; W &gt;</a></td></tr>
<tr class="memitem:a0f3bb9c5625b43d600d33d2bf8c17b60 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1internal_1_1_writer_interface.html#a0f3bb9c5625b43d600d33d2bf8c17b60">~WriterInterface</a> ()</td></tr>
<tr class="separator:a0f3bb9c5625b43d600d33d2bf8c17b60 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a89d051f5c00ede4469cfb216bd05b594 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1internal_1_1_writer_interface.html#a89d051f5c00ede4469cfb216bd05b594">Write</a> (const W &amp;msg)</td></tr>
<tr class="memdesc:a89d051f5c00ede4469cfb216bd05b594 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="mdescLeft">&#160;</td><td class="mdescRight">Block to write <em>msg</em> to the stream with default write options.  <a href="classgrpc_1_1internal_1_1_writer_interface.html#a89d051f5c00ede4469cfb216bd05b594">More...</a><br /></td></tr>
<tr class="separator:a89d051f5c00ede4469cfb216bd05b594 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3308bfe1558e317e5fa3530f74c63ce6 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1internal_1_1_writer_interface.html#a3308bfe1558e317e5fa3530f74c63ce6">WriteLast</a> (const W &amp;msg, <a class="el" href="classgrpc_1_1_write_options.html">WriteOptions</a> options)</td></tr>
<tr class="memdesc:a3308bfe1558e317e5fa3530f74c63ce6 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="mdescLeft">&#160;</td><td class="mdescRight">Write <em>msg</em> and coalesce it with the writing of trailing metadata, using <a class="el" href="classgrpc_1_1_write_options.html" title="Per-message write options. ">WriteOptions</a> <em>options</em>.  <a href="classgrpc_1_1internal_1_1_writer_interface.html#a3308bfe1558e317e5fa3530f74c63ce6">More...</a><br /></td></tr>
<tr class="separator:a3308bfe1558e317e5fa3530f74c63ce6 inherit pub_methods_classgrpc_1_1internal_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classgrpc_1_1internal_1_1_reader_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1internal_1_1_reader_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1internal_1_1_reader_interface.html">grpc::internal::ReaderInterface&lt; R &gt;</a></td></tr>
<tr class="memitem:ad1d28c0720937a61b0f7952d3add7bba inherit pub_methods_classgrpc_1_1internal_1_1_reader_interface"><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1internal_1_1_reader_interface.html#ad1d28c0720937a61b0f7952d3add7bba">~ReaderInterface</a> ()</td></tr>
<tr class="separator:ad1d28c0720937a61b0f7952d3add7bba inherit pub_methods_classgrpc_1_1internal_1_1_reader_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:afecda317e553ccff29f57d43166b2d34"><td class="memItemLeft" align="right" valign="top">class&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#afecda317e553ccff29f57d43166b2d34">internal::ClientReaderWriterFactory&lt; W, R &gt;</a></td></tr>
<tr class="separator:afecda317e553ccff29f57d43166b2d34"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;class W, class R&gt;<br />
class grpc::ClientReaderWriter&lt; W, R &gt;</h3>

<p>Synchronous (blocking) client-side API for bi-directional streaming RPCs, where the outgoing message stream coming from the client has messages of type <em>W</em>, and the incoming messages stream coming from the server has messages of type <em>R</em>. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a9fe0acda29ba46726d69cedfdb043c79"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9fe0acda29ba46726d69cedfdb043c79">&#9670;&nbsp;</a></span>Finish()</h2>

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<div class="memtemplate">
template&lt;class W, class R&gt; </div>
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          <td class="memname"><a class="el" href="classgrpc_1_1_status.html">Status</a> <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::Finish </td>
          <td>(</td>
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<p>See the ClientStreamingInterface.Finish method for semantics. </p>
<p>Side effect:</p><ul>
<li>the <em><a class="el" href="classgrpc_1_1_client_context.html" title="A ClientContext allows the person implementing a service client to: ">ClientContext</a></em> associated with this call is updated with possible trailing metadata sent from the server. </li>
</ul>

<p>Implements <a class="el" href="classgrpc_1_1internal_1_1_client_streaming_interface.html#a47321b8c130947bcef5c793329a54619">grpc::internal::ClientStreamingInterface</a>.</p>

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<a id="a85c3018b87b4110c98b9f7f91adbfcef"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a85c3018b87b4110c98b9f7f91adbfcef">&#9670;&nbsp;</a></span>NextMessageSize()</h2>

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<div class="memproto">
<div class="memtemplate">
template&lt;class W, class R&gt; </div>
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          <td class="memname">bool <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::NextMessageSize </td>
          <td>(</td>
          <td class="paramtype">uint32_t *&#160;</td>
          <td class="paramname"><em>sz</em></td><td>)</td>
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<p>Get an upper bound on the next message size available for reading on this stream. </p>

<p>Implements <a class="el" href="classgrpc_1_1internal_1_1_reader_interface.html#ad3216783fae57e614181e28df9435f33">grpc::internal::ReaderInterface&lt; R &gt;</a>.</p>

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<a id="aa8887778273bea6ad32ffea3a6105699"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa8887778273bea6ad32ffea3a6105699">&#9670;&nbsp;</a></span>Read()</h2>

<div class="memitem">
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<div class="memtemplate">
template&lt;class W, class R&gt; </div>
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          <td class="memname">bool <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::Read </td>
          <td>(</td>
          <td class="paramtype">R *&#160;</td>
          <td class="paramname"><em>msg</em></td><td>)</td>
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<p>See the <em>ReaderInterface.Read</em> method for semantics. </p>
<p>Side effect: Also receives initial metadata if not already received (updates the <em><a class="el" href="classgrpc_1_1_client_context.html" title="A ClientContext allows the person implementing a service client to: ">ClientContext</a></em> associated with this call in that case). </p>

<p>Implements <a class="el" href="classgrpc_1_1internal_1_1_reader_interface.html#adfb50ace59b4b9666a46548d3f732ee8">grpc::internal::ReaderInterface&lt; R &gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#ab6f436ca034fbc2e5e8035e637f7f5fc">&#9670;&nbsp;</a></span>WaitForInitialMetadata()</h2>

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template&lt;class W, class R&gt; </div>
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          <td class="memname">void <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::WaitForInitialMetadata </td>
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<p>Block waiting to read initial metadata from the server. </p>
<p>This call is optional, but if it is used, it cannot be used concurrently with or after the <em>Finish</em> method.</p>
<p>Once complete, the initial metadata read from the server will be accessable through the <em><a class="el" href="classgrpc_1_1_client_context.html" title="A ClientContext allows the person implementing a service client to: ">ClientContext</a></em> used to construct this object. </p>

<p>Implements <a class="el" href="classgrpc_1_1_client_reader_writer_interface.html#a6ead554cc1b991f2289b26fb80fdde5e">grpc::ClientReaderWriterInterface&lt; W, R &gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#ae30b0e18622f4132b1c7654e24605d53">&#9670;&nbsp;</a></span>Write()</h2>

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template&lt;class W, class R&gt; </div>
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          <td class="memname">bool <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::Write </td>
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          <td class="paramtype">const W &amp;&#160;</td>
          <td class="paramname"><em>msg</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="classgrpc_1_1_write_options.html">WriteOptions</a>&#160;</td>
          <td class="paramname"><em>options</em>&#160;</td>
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          <td>)</td>
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<p>Block to write <em>msg</em> to the stream with <a class="el" href="classgrpc_1_1_write_options.html" title="Per-message write options. ">WriteOptions</a> <em>options</em>. </p>
<p>This is thread-safe with respect to <em>ReaderInterface::Read</em> </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">msg</td><td>The message to be written to the stream. </td></tr>
    <tr><td class="paramname">options</td><td>The <a class="el" href="classgrpc_1_1_write_options.html" title="Per-message write options. ">WriteOptions</a> affecting the write operation.</td></tr>
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  </dd>
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<dl class="section return"><dt>Returns</dt><dd><em>true</em> on success, <em>false</em> when the stream has been closed. </dd></dl>

<p>Implements <a class="el" href="classgrpc_1_1internal_1_1_writer_interface.html#add3e3940ba338ab08705ea69d017a80b">grpc::internal::WriterInterface&lt; W &gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a183f35c478b847e939c76cb20c69a359">&#9670;&nbsp;</a></span>WritesDone()</h2>

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template&lt;class W, class R&gt; </div>
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          <td class="memname">bool <a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::WritesDone </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
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<p>Half close writing from the client. </p>
<p>(signal that the stream of messages coming from the clinet is complete). Blocks until currently-pending writes are completed. Thread-safe with respect to <em>ReaderInterface::Read</em> </p>
<dl class="section return"><dt>Returns</dt><dd>Whether the writes were successful. </dd></dl>

<p>Implements <a class="el" href="classgrpc_1_1_client_reader_writer_interface.html#a52f4e5d5ac7fe0e4995cb337aa0ecfc8">grpc::ClientReaderWriterInterface&lt; W, R &gt;</a>.</p>

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<h2 class="groupheader">Friends And Related Function Documentation</h2>
<a id="afecda317e553ccff29f57d43166b2d34"></a>
<h2 class="memtitle"><span class="permalink"><a href="#afecda317e553ccff29f57d43166b2d34">&#9670;&nbsp;</a></span>internal::ClientReaderWriterFactory< W, R ></h2>

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template&lt;class W, class R&gt; </div>
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          <td class="memname">friend class <a class="el" href="classgrpc_1_1internal_1_1_client_reader_writer_factory.html">internal::ClientReaderWriterFactory</a>&lt; W, R &gt;</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 files:<ul>
<li>include/grpcpp/impl/codegen/<a class="el" href="grpcpp_2impl_2codegen_2channel__interface_8h_source.html">channel_interface.h</a></li>
<li>include/grpcpp/impl/codegen/<a class="el" href="grpcpp_2impl_2codegen_2sync__stream_8h_source.html">sync_stream.h</a></li>
</ul>
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