dentifier">a</span><span class="special">)</span>
<span class="special">...</span>
<em class="replaceable"><code><span class="identifier">MACRO</span></code></em><span class="special">(</span><a class="link" href="BOOST_PROTO_MAX_ARITY.html" title="Macro BOOST_PROTO_MAX_ARITY">BOOST_PROTO_MAX_ARITY</a><span class="special">,</span> <span class="identifier">typename_A</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">A_a</span><span 