ypename</span> <span class="identifier">Pair</span><span class="special">::</span><span class="identifier">first_type</span> <span class="special">&amp;</span> <a name="idp89317936-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Pair</span> <span class="special">&amp;</span> pair<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variab