special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span> <a name="id-1_3_41_13_25_1_1_1_5-bb"></a><span class="identifier">param</span><span class="special">(</span><a class="link" href="../any.html" title="Class any">any</a><span class="special">&lt;</span> <span class="identifier">Concept</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">&gt;</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="