mplate</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="is_old_value_copyable.html" title="Struct template is_old_value_copyable">is_old_value_copyable</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_copy_constructible</span><span class="special">&lt;</span> <span class=