ndexterm" name="boost_asio.indexterm.basic_socket.bytes_readable"></a> 
IO
          control command to get the amount of data that can be read without blocking.
        </p>
<pre class="programlisting">typedef implementation_defined bytes_readable;
</pre>
<p>
          Implements the FIONREAD IO control command.
        </p>
<h6>
<a name="boost_asio.reference.basic_socket.bytes_readable.h0"></a>
          <span class="phrase"><a name="boost_asio.reference.basic_socket.bytes_readable.example"></a></span><a 