ss="special">&lt;</span> <span class="keyword">class</span> <span class="identifier">Map</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CompatibleKey</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">CompatibleData</span> <span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">use_it</span><span class="special">(</span> <span class="identifier">Map</span> <span class="special