整理

include/boost/preprocessor/facilities/identity.hpp

@@ -0,0 +1,27 @@
+# /* Copyright (C) 2001
+#  * Housemarque Oy
+#  * http://www.housemarque.com
+#  *
+#  * Distributed under the Boost Software License, Version 1.0. (See
+#  * accompanying file LICENSE_1_0.txt or copy at
+#  * http://www.boost.org/LICENSE_1_0.txt)
+#  */
+#
+# /* Revised by Paul Mensonides (2002) */
+# /* Revised by Edward Diener (2015) */
+#
+# /* See http://www.boost.org for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_FACILITIES_IDENTITY_HPP
+# define BOOST_PREPROCESSOR_FACILITIES_IDENTITY_HPP
+#
+# include <boost/preprocessor/facilities/empty.hpp>
+# include <boost/preprocessor/tuple/eat.hpp>
+#
+# /* BOOST_PP_IDENTITY */
+#
+# define BOOST_PP_IDENTITY(item) item BOOST_PP_EMPTY
+#
+# define BOOST_PP_IDENTITY_N(item,n) item BOOST_PP_TUPLE_EAT_N(n)
+#
+# endif