code class="computeroutput"><span class="identifier">write</span></code> returns for
          all flush options, and so can be used to determine the amount of currently
          consumed input in bits. The <a class="link" href="../boost__beast__zlib__Flush.html" title="zlib::Flush"><code class="computeroutput"><span class="identifier">Flush</span><span class="special">::</span><span class="identifier">trees</span></code></a> option behaves as <a class="link" href="../boost__beast__zlib__Flush.html" title=