le="Body"><span class="emphasis"><em>Body</em></span></a>
          <code class="computeroutput"><span class="identifier">reader</span></code> and <code class="computeroutput"><span class="identifier">writer</span></code> ctor signatures
        </li>
</ul></div>
<h4>
<a name="beast.release_notes.h3"></a>
      <span class="phrase"><a name="beast.release_notes.boost_1_67"></a></span><a class="link" href="release_notes.html#beast.release_notes.boost_1_67">Boost
      1.67</a>
    </h4>
<p>
      This version