erence</span>       <span class="identifier">second</span><span class="special">();</span>
    <span class="identifier">second_const_reference</span> <span class="identifier">second</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>

    <span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">compressed_pair</span><span class="special">&amp;</span> <span class="identifier">y</span><span c