span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">units</span><span class="special">::</span><span class="identifier">base_dimension</span><span class="special">&lt;</span> <span class="identifier">plane_angle_base_dimension</span><span class="special">,</span><span class="special">-</span><span class="number">2</span> <span class="special">&gt;</span>
<span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
</di