ions</a></span>
    <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="map/on_definedness_idp41603648.html#idp41606160-bb"><span class="identifier">add_intersection</span></a><span class="special">(</span><span class="identifier">Type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const