an class="identifier">T</span> <a class="link" href="reference_wrapper.html#boost.reference_wrapper.type"><span class="identifier">type</span></a><span class="special">;</span>

  <span class="comment">// <a class="link" href="reference_wrapper.html#boost.reference_wrapperconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="reference_wrapper.html#idm45666332851328-bb"><span class="identifier">reference_wrapper</span></a><span class="specia