><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">compressed_pair</span><span class="special">&amp;);</span>

    <span class="identifier">first_reference</span>       <span class="identifier">first</span><span class="special">();</span>
    <span class="identifier">first_const_reference</span> <span class="identifier">first</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>

    <span class="identifier">second_ref