entifier">W</span><span class="special">::</span><span class="identifier">const_buffers_type</span><span class="special">&gt;</span></code>
                </p>
              </td>
<td>
                <p>
                  Called one or more times after <code class="computeroutput"><span class="identifier">init</span></code>
                  succeeds. This function returns <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span><