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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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<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="channel__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:aa1ac2b4a6f0ced02e2f56513e7394070"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_client_reader_writer.html#aa1ac2b4a6f0ced02e2f56513e7394070">ClientReaderWriter</a> (<a class="el" href="classgrpc_1_1_channel_interface.html">ChannelInterface</a> *channel, const <a class="el" href="classgrpc_1_1_rpc_method.html">RpcMethod</a> &amp;method, <a class="el" href="classgrpc_1_1_client_context.html">ClientContext</a> *context)</td></tr>
<tr class="memdesc:aa1ac2b4a6f0ced02e2f56513e7394070"><td class="mdescLeft">&#160;</td><td class="mdescRight">Block to create a stream and write the initial metadata and <em>request</em> out.  <a href="#aa1ac2b4a6f0ced02e2f56513e7394070">More...</a><br/></td></tr>
<tr class="separator:aa1ac2b4a6f0ced02e2f56513e7394070"><td class="memSeparator" colspan="2">&#160;</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><a class="el" href="classgrpc_1_1_reader_interface.html#a04a1da8610d790ea86ecd5a14fe892b8" title="Block to read a message and parse to msg. ">ReaderInterface.Read</a></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 <a class="el" href="classgrpc_1_1_client_streaming_interface.html#a98e2927a42c793017ce7d8c6e88539c4" title="Block waiting until the stream finishes and a final status of the call is available. ">ClientStreamingInterface.Finish</a> 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_1_client_streaming_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1_client_streaming_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1_client_streaming_interface.html">grpc::ClientStreamingInterface</a></td></tr>
<tr class="memitem:a312c9454c0f950e1c75b5c802bcbb00e inherit pub_methods_classgrpc_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_1_client_streaming_interface.html#a312c9454c0f950e1c75b5c802bcbb00e">~ClientStreamingInterface</a> ()</td></tr>
<tr class="separator:a312c9454c0f950e1c75b5c802bcbb00e inherit pub_methods_classgrpc_1_1_client_streaming_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classgrpc_1_1_writer_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1_writer_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1_writer_interface.html">grpc::WriterInterface&lt; W &gt;</a></td></tr>
<tr class="memitem:a447d71736fb6e8c6bd21287ecc3a9f75 inherit pub_methods_classgrpc_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_1_writer_interface.html#a447d71736fb6e8c6bd21287ecc3a9f75">~WriterInterface</a> ()</td></tr>
<tr class="separator:a447d71736fb6e8c6bd21287ecc3a9f75 inherit pub_methods_classgrpc_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5ddbce2a74455afea61fc21e16b01c6a inherit pub_methods_classgrpc_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_1_writer_interface.html#a5ddbce2a74455afea61fc21e16b01c6a">Write</a> (const W &amp;msg)</td></tr>
<tr class="memdesc:a5ddbce2a74455afea61fc21e16b01c6a inherit pub_methods_classgrpc_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="#a5ddbce2a74455afea61fc21e16b01c6a">More...</a><br/></td></tr>
<tr class="separator:a5ddbce2a74455afea61fc21e16b01c6a inherit pub_methods_classgrpc_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8a4180c8928156e9daffa18465866ad2 inherit pub_methods_classgrpc_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_1_writer_interface.html#a8a4180c8928156e9daffa18465866ad2">WriteLast</a> (const W &amp;msg, <a class="el" href="classgrpc_1_1_write_options.html">WriteOptions</a> options)</td></tr>
<tr class="memdesc:a8a4180c8928156e9daffa18465866ad2 inherit pub_methods_classgrpc_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="#a8a4180c8928156e9daffa18465866ad2">More...</a><br/></td></tr>
<tr class="separator:a8a4180c8928156e9daffa18465866ad2 inherit pub_methods_classgrpc_1_1_writer_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classgrpc_1_1_reader_interface"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgrpc_1_1_reader_interface')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classgrpc_1_1_reader_interface.html">grpc::ReaderInterface&lt; R &gt;</a></td></tr>
<tr class="memitem:a1fbd3d6e86e2f97e5444f29b0af0a9d5 inherit pub_methods_classgrpc_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_1_reader_interface.html#a1fbd3d6e86e2f97e5444f29b0af0a9d5">~ReaderInterface</a> ()</td></tr>
<tr class="separator:a1fbd3d6e86e2f97e5444f29b0af0a9d5 inherit pub_methods_classgrpc_1_1_reader_interface"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<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">Constructor &amp; Destructor Documentation</h2>
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          <td class="memname"><a class="el" href="classgrpc_1_1_client_reader_writer.html">grpc::ClientReaderWriter</a>&lt; W, R &gt;::<a class="el" href="classgrpc_1_1_client_reader_writer.html">ClientReaderWriter</a> </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classgrpc_1_1_channel_interface.html">ChannelInterface</a> *&#160;</td>
          <td class="paramname"><em>channel</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const <a class="el" href="classgrpc_1_1_rpc_method.html">RpcMethod</a> &amp;&#160;</td>
          <td class="paramname"><em>method</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="classgrpc_1_1_client_context.html">ClientContext</a> *&#160;</td>
          <td class="paramname"><em>context</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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<p>Block to create a stream and write the initial metadata and <em>request</em> out. </p>
<p>Note that <em>context</em> will be used to fill in custom initial metadata used to send to the server when starting the call. </p>

</div>
</div>
<h2 class="groupheader">Member Function Documentation</h2>
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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>
          <td class="paramname"></td><td>)</td>
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<p>See the <a class="el" href="classgrpc_1_1_client_streaming_interface.html#a98e2927a42c793017ce7d8c6e88539c4" title="Block waiting until the stream finishes and a final status of the call is available. ">ClientStreamingInterface.Finish</a> 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_1_client_streaming_interface.html#a98e2927a42c793017ce7d8c6e88539c4">grpc::ClientStreamingInterface</a>.</p>

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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>
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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_1_reader_interface.html#a4ad823a3c32ec163fca5fc175dcb102f">grpc::ReaderInterface&lt; R &gt;</a>.</p>

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<p>See the <em><a class="el" href="classgrpc_1_1_reader_interface.html#a04a1da8610d790ea86ecd5a14fe892b8" title="Block to read a message and parse to msg. ">ReaderInterface.Read</a></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_1_reader_interface.html#a04a1da8610d790ea86ecd5a14fe892b8">grpc::ReaderInterface&lt; R &gt;</a>.</p>

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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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<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><a class="el" href="classgrpc_1_1_reader_interface.html#a04a1da8610d790ea86ecd5a14fe892b8" title="Block to read a message and parse to msg. ">ReaderInterface::Read</a></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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<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_1_writer_interface.html#ae2ddda78f4e1deadf858a68b955e787d">grpc::WriterInterface&lt; W &gt;</a>.</p>

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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><a class="el" href="classgrpc_1_1_reader_interface.html#a04a1da8610d790ea86ecd5a14fe892b8" title="Block to read a message and parse to msg. ">ReaderInterface::Read</a></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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<hr/>The documentation for this class was generated from the following files:<ul>
<li>include/grpc++/impl/codegen/<a class="el" href="channel__interface_8h_source.html">channel_interface.h</a></li>
<li>include/grpc++/impl/codegen/<a class="el" href="impl_2codegen_2sync__stream_8h_source.html">sync_stream.h</a></li>
</ul>
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