cial">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.is_recursive_wrapper.type"></a><span class="identifier">type</span><span class="special">;</span>

  <span class="comment">// static constants</span>
  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">value</span> = <span class="identifier