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  27 <a name="boost_asio.reference.basic_stream_socket.async_send.overload2"></a><a class="link" href="overload2.html" title="basic_stream_socket::async_send (2 of 2 overloads)">basic_stream_socket::async_send
  28           (2 of 2 overloads)</a>
  29 </h5></div></div></div>
  30 <p>
  31             Start an asynchronous send.
  32           </p>
  33 <pre class="programlisting">template&lt;
  34     typename <a class="link" href="../../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
  35     typename <a class="link" href="../../WriteHandler.html" title="Write handler requirements">WriteHandler</a> = <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  36 <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_send(
  37     const ConstBufferSequence &amp; buffers,
  38     socket_base::message_flags flags,
  39     WriteHandler &amp;&amp; handler = <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
  40 </pre>
  41 <p>
  42             This function is used to asynchronously send data on the stream socket.
  43             The function call always returns immediately.
  44           </p>
  45 <h6>
  46 <a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h0"></a>
  47             <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.parameters">Parameters</a>
  48           </h6>
  49 <div class="variablelist">
  50 <p class="title"><b></b></p>
  51 <dl class="variablelist">
  52 <dt><span class="term">buffers</span></dt>
  53 <dd><p>
  54                   One or more data buffers to be sent on the socket. Although the
  55                   buffers object may be copied as necessary, ownership of the underlying
  56                   memory blocks is retained by the caller, which must guarantee that
  57                   they remain valid until the handler is called.
  58                 </p></dd>
  59 <dt><span class="term">flags</span></dt>
  60 <dd><p>
  61                   Flags specifying how the send call is to be made.
  62                 </p></dd>
  63 <dt><span class="term">handler</span></dt>
  64 <dd>
  65 <p>
  66                   The handler to be called when the send operation completes. Copies
  67                   will be made of the handler as required. The function signature
  68                   of the handler must be:
  69 </p>
  70 <pre class="programlisting">void handler(
  71   const boost::system::error_code&amp; error, // Result of operation.
  72   std::size_t bytes_transferred           // Number of bytes sent.
  73 );
  74 </pre>
  75 <p>
  76                   Regardless of whether the asynchronous operation completes immediately
  77                   or not, the handler will not be invoked from within this function.
  78                   On immediate completion, invocation of the handler will be performed
  79                   in a manner equivalent to using <a class="link" href="../../post.html" title="post"><code class="computeroutput">post</code></a>.
  80                 </p>
  81 </dd>
  82 </dl>
  83 </div>
  84 <h6>
  85 <a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h1"></a>
  86             <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.remarks"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.remarks">Remarks</a>
  87           </h6>
  88 <p>
  89             The send operation may not transmit all of the data to the peer. Consider
  90             using the <a class="link" href="../../async_write.html" title="async_write"><code class="computeroutput">async_write</code></a>
  91             function if you need to ensure that all data is written before the asynchronous
  92             operation completes.
  93           </p>
  94 <h6>
  95 <a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h2"></a>
  96             <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.example"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.example">Example</a>
  97           </h6>
  98 <p>
  99             To send a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
 100             function as follows:
 101           </p>
 102 <pre class="programlisting">socket.async_send(boost::asio::buffer(data, size), 0, handler);
 103 </pre>
 104 <p>
 105             See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
 106             documentation for information on sending multiple buffers in one go,
 107             and how to use it with arrays, boost::array or std::vector.
 108           </p>
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