a><span class="special">(</span><span class="identifier">ForwardIt1</span><span class="special">,</span> <span class="identifier">ForwardIt1</span><span class="special">,</span> <span class="identifier">ForwardIt2</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> BidirIt1<span class="special">,</span> <span class="keyword">typename</span> BidirIt2<span class="special">&gt;</span> 
 