n class="identifier">I</span><span class="special">,</span> <span class="identifier">I</span><span class="special">,</span> <span class="identifier">O</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> I<span class="special">,</span> <span class="keyword">typename</span> F<span class="special">&gt;</span> <span class="identifier">F</span> <a class="link" href="../boost/uninitialized_