1
2#ifndef BOOST_MPL_IDENTITY_HPP_INCLUDED
3#define BOOST_MPL_IDENTITY_HPP_INCLUDED
4
5// Copyright Aleksey Gurtovoy 2000-2004
6//
7// Distributed under the Boost Software License, Version 1.0.
8// (See accompanying file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Id$
14// $Date$
15// $Revision$
16
17#include <boost/mpl/aux_/na_spec.hpp>
18#include <boost/mpl/aux_/lambda_support.hpp>
19
20namespace boost { namespace mpl {
21
22template<
23 typename BOOST_MPL_AUX_NA_PARAM(T)
24 >
25struct identity
26{
27 typedef T type;
28 BOOST_MPL_AUX_LAMBDA_SUPPORT(1, identity, (T))
29};
30
31template<
32 typename BOOST_MPL_AUX_NA_PARAM(T)
33 >
34struct make_identity
35{
36 typedef identity<T> type;
37 BOOST_MPL_AUX_LAMBDA_SUPPORT(1, make_identity, (T))
38};
39
40BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity)
41BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity)
42
43}}
44
45#endif // BOOST_MPL_IDENTITY_HPP_INCLUDED
46