ntifier">sum_size</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">static_unsigned_max</span><span class="special">&lt;</span><span class="identifier">AddendSize1</span><span class="special">,</span> <span class="identifier">AddendSize2</span><span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">+</span> <span class="number">1</span><span class="special">;</span>

    <span class="keywo