1# /* Copyright (C) 2001
2# * Housemarque Oy
3# * http://www.housemarque.com
4# *
5# * Distributed under the Boost Software License, Version 1.0. (See
6# * accompanying file LICENSE_1_0.txt or copy at
7# * http://www.boost.org/LICENSE_1_0.txt)
8# */
9#
10# /* Revised by Paul Mensonides (2002) */
11# /* Revised by Edward Diener (2015) */
12#
13# /* See http://www.boost.org for most recent version. */
14#
15# ifndef BOOST_PREPROCESSOR_FACILITIES_IDENTITY_HPP
16# define BOOST_PREPROCESSOR_FACILITIES_IDENTITY_HPP
17#
18# include <boost/preprocessor/facilities/empty.hpp>
19# include <boost/preprocessor/tuple/eat.hpp>
20#
21# /* BOOST_PP_IDENTITY */
22#
23# define BOOST_PP_IDENTITY(item) item BOOST_PP_EMPTY
24#
25# define BOOST_PP_IDENTITY_N(item,n) item BOOST_PP_TUPLE_EAT_N(n)
26#
27# endif
28

source code of boost/boost/preprocessor/facilities/identity.hpp