fier">OtherValue</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span>
      <span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span>
            <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_convertible</span><spa