span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> keyword<span class="special">,</span> 
                     <span class="identifier">record</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">,</span> <span class="identifier">DefaultT</span> <span class="keyword">const</span> <span class="special">&amp;</span> def_val<span class=