ne</span></a><span class="special">;</span>

    <span class="comment">// <a class="link" href="map/on_invertible_Typ_id672601.html#id672625-bb">public static functions</a></span>
    <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="map/on_invertible_Typ_id672601.html#id672627-bb"><span class="identifier">subtract</span></a><span class="special">(</span><span class="identifier">Type</span> <span class="special">&amp;</span><span class="special">,</span> <span class