       is non-const.
          </li>
<li class="listitem">
            A configurable maximum buffer size may be set upon construction. Attempts
            to exceed the buffer size will throw <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">length_error</span></code>.
          </li>
<li class="listitem">
            Buffer sequences representing the readable and writable bytes, returned
            by <a class="link" href="boost__beas