class="special">(</span><a class="link" href="map.html" title="Class template map">map</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> SubObject<span class="special">&gt;</span> <span class="keyword">bool</span> <a class="link" href="map.html#id673144-bb"><span class="identifier">contains</span></a><span class="special">(</span><span class="keyword"