       <a class="indexterm" name="boost_asio.indexterm.buffered_write_stream.async_flush"></a> 
Start
          an asynchronous flush.
        </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
<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> asyn