 <span class="number">2</span><span class="special">);</span>

    <span class="keyword">double</span> <span class="identifier">x</span> <span class="special">=</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">get</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">point</span><span class="special">);</span>
    <span class="keyword">double</span> <span class="identifier">y</span> <span