t::reference_wrapper&lt; T &gt;)&gt;">result</a><span class="special">&lt;</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">reference_wrapper</span><span class="special">&lt;</span> <span class="identifier">T</span> <span class="special">&gt;</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword"></span> <span class="identifie