tifier">first_int_is_key</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">UnorderedMap</span><span class="special">;</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
   <span class="identifier">BOOST_STATIC_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="