Added BOOST_PP_EXPAND()

[SVN r12362]

include/boost/preprocessor/expand.hpp

@@ -0,0 +1,24 @@
+#ifndef BOOST_PREPROCESSOR_EXPAND_HPP
+#define BOOST_PREPROCESSOR_EXPAND_HPP
+
+// Copyright (C) 2001
+// Housemarque Oy
+// http://www.housemarque.com
+//
+// Permission to copy, use, modify, sell and distribute this software is
+// granted provided this copyright notice appears in all copies. This
+// software is provided "as is" without express or implied warranty, and
+// with no claim as to its suitability for any purpose.
+
+// See http://www.boost.org for most recent version.
+
+/*! \file
+
+<a href="../../../../boost/preprocessor/expand.hpp">Click here to see the header.</a>
+*/
+
+#include <boost/preprocessor/identity.hpp>
+
+//! Essentially macro expands the parameter X twice.
+#define BOOST_PP_EXPAND(X) X
+#endif