.interprocess.weak_ptr.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>  

  <span class="comment">// <a class="link" href="weak_ptr.html#boost.interprocess.weak_ptrconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="weak_ptr.html#idp50628480-bb"><span class="identifier">weak_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="specia