 <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="param.html#boost.type_erasure.paramconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span> <a class="link" href="param.html#id-1_3_41_13_25_1_1_1_5-bb"><span class="identifier">param</span></a><span class="special">(