span> Arg1<span class="special">,</span> <span class="keyword">typename</span> Arg2<span class="special">&gt;</span> 
    <a class="link" href="nil.html" title="Struct nil">nil</a> <a class="link" href="nil.html#idp60407776-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Arg1</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="ide