span><span class="special">()()</span>
   <span class="special">{</span>
      <span class="identifier">b</span> <span class="special">+=</span> <span class="number">2</span><span class="special">;</span>
      <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">);</span>