entifier">is_red_o</span> <span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Value</span><span class="special">&gt;</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Value</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">v</span><span class="special">)</span> <