lue</span><span class="special">&lt;</span><span class="identifier">first_int_is_key</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">OrderedMap</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">unordered_set</span><span class="special">&lt;</span> <span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">key_of_value</span><span class="special">&lt;</span><span class="iden