tifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">polygon</span><span class="special">&gt;</span> <span class="identifier">shp</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">,</span> <span class="identifier">shp</span><span class="special">&gt;</span> <spa