 is, in fact, just another name for <code><a href="../Reference/fold.html">fold</a></code>. It was introduced for symmetry with <code><a href="../Reference/copy_if.html">copy_if</a></code> [<a href="#1">1</a>], and because it's a nice name for one of the typical <code>fold</code> applications, that is, copying the content of one sequence into another - see the example below.
<p>
<h3>Definition</h3>
<p>
<pre>
#include "<a href="../../../../../boost/mpl/copy.hpp">boost/mpl/copy.hpp</a>"
</pre>
<p>
<h3>Paramet