">policies</span><span class="special">::</span><span class="identifier">checked_narrowing_cast</span><span class="special">&lt;</span><span class="identifier">result_type</span><span class="special">,</span> <span class="identifier">forwarding_policy</span><span class="special">&gt;(</span>
         <span class="identifier">detail</span><span class="special">::</span><span class="identifier">my_special_imp</span><span class="special">(</span>
               <span class="keyword">static_cast</span><span cla