pan><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="category.html" title="Class template category">category</a><span class="special">&lt;</span> <span class="identifier">V</span><span class="special">,</span> <span class="identifier">M</span><span class="special">,</span> <span class="identifier">O</span><span class="special">,</span> <span class="identifier">A</span> <span class="special">&gt;</span> <span class="special">&amp;</span> o<