/span> action<span class="special">,</span> <span class="identifier">T</span> <span class="special">&amp;&amp;</span> arg<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">false_type</span><span class="special">)</span><span class="special">;</span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Action<span class="special">,</span> <span class="keyword">typename</span> T<