-zero return value indicates the maximum number of bytes to
                be read on the next call to the stream's read_some function.
              </p>
</dd>
</dl>
</div>
<h6>
<a name="boost_asio.reference.read.overload7.h1"></a>
          <span class="phrase"><a name="boost_asio.reference.read.overload7.return_value"></a></span><a class="link" href="overload7.html#boost_asio.reference.read.overload7.return_value">Return
          Value</a>
        </h6>
<p>
          The number of bytes transferred.
  