rd">typename</span> T<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="old_value_copy.html" title="Struct template old_value_copy">old_value_copy</a> <span class="special">{</span>
  <span class="comment">// <a class="link" href="old_value_copy.html#boost.contract.old_value_copyconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="old_value_copy.html#idm36463-bb"><span class="identifier">old_value_