">typedef</span> <span class="keyword">typename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="special">&amp;</span> <a class="link" href="first/result_This_Pa_idp89313296.html#boost.proto.functional.first.result_This(Pa_idp89313296.type"><span class="identifier">type</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>
  <span class="keyword">template</span><span class="spec