           An error occurs.
            </li>
</ul></div>
<p>
          This operation is implemented in terms of zero or more calls to the stream's
          <code class="computeroutput"><span class="identifier">async_write_some</span></code> function,
          and is known as a <span class="emphasis"><em>composed operation</em></span>. The program
          must ensure that the stream performs no other writes until this operation
          completes. The algorithm will use a temporary <a class="link" hre