cial">&gt;</span> <span class="special">{</span>

  <span class="comment">// <a class="link" href="promote_base.html#idp27668912-bb">public member functions</a></span>
  <span class="identifier">To</span> <a class="link" href="promote_base.html#idp27669120-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">From</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keywo