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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 | ||
20 | namespace boost { namespace mpl { | |
21 | ||
22 | template< | |
23 | typename BOOST_MPL_AUX_NA_PARAM(T) | |
24 | > | |
25 | struct identity | |
26 | { | |
27 | typedef T type; | |
28 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, identity, (T)) | |
29 | }; | |
30 | ||
31 | template< | |
32 | typename BOOST_MPL_AUX_NA_PARAM(T) | |
33 | > | |
34 | struct make_identity | |
35 | { | |
36 | typedef identity<T> type; | |
37 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, make_identity, (T)) | |
38 | }; | |
39 | ||
40 | BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity) | |
41 | BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity) | |
42 | ||
43 | }} | |
44 | ||
45 | #endif // BOOST_MPL_IDENTITY_HPP_INCLUDED |