ss="keyword">return</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">first</span><span class="special">;</span>  <span class="special">}</span>
<span class="special">};</span>

<span class="comment">//Define omap like ordered and unordered classes </span>
<span class="keyword">typedef</span> <span class="identifier">set</span><span class="special">&lt;</span> <span class="identifier">MyClass</span><span class="special">,</span> <span class="identifier">key_of_va