"identifier">boost</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">polygon</span><span class="special">;</span>

    <span class="identifier">polygon</span> <span class="identifier">poly</span><span class="special">;</span>

    <span class="comment">// Append a ra