pan class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Type</span><span class="special">::</span><span class="identifier">iterator</span> it_<span class="special">,</span> 
                     <span class="keyword">const</span> <span class="keyword">typename</span> <span class="identifier">Type</span><span class="special">::</span><span class="identifier">codomain_type</span> <span class="special">&amp;</span> co_value<span class="special">)</span><span class="special">