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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_asio.reference.basic_raw_socket.async_wait"></a><a class="link" href="async_wait.html" title="basic_raw_socket::async_wait">basic_raw_socket::async_wait</a>
  28 </h4></div></div></div>
  29 <p>
  30           <span class="emphasis"><em>Inherited from basic_socket.</em></span>
  31         </p>
  32 <p>
  33           <a class="indexterm" name="boost_asio.indexterm.basic_raw_socket.async_wait"></a>
  34 Asynchronously
  35           wait for the socket to become ready to read, ready to write, or to have
  36           pending error conditions.
  37         </p>
  38 <pre class="programlisting">template&lt;
  39     typename <a class="link" href="../WaitHandler.html" title="Wait handler requirements">WaitHandler</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;
  40 <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_wait(
  41     wait_type w,
  42     WaitHandler &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>);
  43 </pre>
  44 <p>
  45           This function is used to perform an asynchronous wait for a socket to enter
  46           a ready to read, write or error condition state.
  47         </p>
  48 <h6>
  49 <a name="boost_asio.reference.basic_raw_socket.async_wait.h0"></a>
  50           <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_wait.parameters"></a></span><a class="link" href="async_wait.html#boost_asio.reference.basic_raw_socket.async_wait.parameters">Parameters</a>
  51         </h6>
  52 <div class="variablelist">
  53 <p class="title"><b></b></p>
  54 <dl class="variablelist">
  55 <dt><span class="term">w</span></dt>
  56 <dd><p>
  57                 Specifies the desired socket state.
  58               </p></dd>
  59 <dt><span class="term">handler</span></dt>
  60 <dd>
  61 <p>
  62                 The handler to be called when the wait operation completes. Copies
  63                 will be made of the handler as required. The function signature of
  64                 the handler must be:
  65 </p>
  66 <pre class="programlisting">void handler(
  67   const boost::system::error_code&amp; error // Result of operation
  68 );
  69 </pre>
  70 <p>
  71                 Regardless of whether the asynchronous operation completes immediately
  72                 or not, the handler will not be invoked from within this function.
  73                 On immediate completion, invocation of the handler will be performed
  74                 in a manner equivalent to using <a class="link" href="../post.html" title="post"><code class="computeroutput">post</code></a>.
  75               </p>
  76 </dd>
  77 </dl>
  78 </div>
  79 <h6>
  80 <a name="boost_asio.reference.basic_raw_socket.async_wait.h1"></a>
  81           <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_wait.example"></a></span><a class="link" href="async_wait.html#boost_asio.reference.basic_raw_socket.async_wait.example">Example</a>
  82         </h6>
  83 <pre class="programlisting">void wait_handler(const boost::system::error_code&amp; error)
  84 {
  85   if (!error)
  86   {
  87     // Wait succeeded.
  88   }
  89 }
  90
  91 ...
  92
  93 boost::asio::ip::tcp::socket socket(my_context);
  94 ...
  95 socket.async_wait(boost::asio::ip::tcp::socket::wait_read, wait_handler);
  96 </pre>
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