]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | |
2 | #ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED | |
3 | #define BOOST_MPL_AUX_NA_HPP_INCLUDED | |
4 | ||
5 | // Copyright Aleksey Gurtovoy 2001-2004 | |
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/bool.hpp> | |
18 | #include <boost/mpl/aux_/na_fwd.hpp> | |
19 | #include <boost/mpl/aux_/config/msvc.hpp> | |
20 | #include <boost/mpl/aux_/config/ctps.hpp> | |
21 | ||
22 | namespace boost { namespace mpl { | |
23 | ||
24 | template< typename T > | |
25 | struct is_na | |
26 | : false_ | |
27 | { | |
28 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
29 | using false_::value; | |
30 | #endif | |
31 | }; | |
32 | ||
33 | template<> | |
34 | struct is_na<na> | |
35 | : true_ | |
36 | { | |
37 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
38 | using true_::value; | |
39 | #endif | |
40 | }; | |
41 | ||
42 | template< typename T > | |
43 | struct is_not_na | |
44 | : true_ | |
45 | { | |
46 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
47 | using true_::value; | |
48 | #endif | |
49 | }; | |
50 | ||
51 | template<> | |
52 | struct is_not_na<na> | |
53 | : false_ | |
54 | { | |
55 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
56 | using false_::value; | |
57 | #endif | |
58 | }; | |
59 | ||
60 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
61 | template< typename T, typename U > struct if_na | |
62 | { | |
63 | typedef T type; | |
64 | }; | |
65 | ||
66 | template< typename U > struct if_na<na,U> | |
67 | { | |
68 | typedef U type; | |
69 | }; | |
70 | #else | |
71 | template< typename T > struct if_na_impl | |
72 | { | |
73 | template< typename U > struct apply | |
74 | { | |
75 | typedef T type; | |
76 | }; | |
77 | }; | |
78 | ||
79 | template<> struct if_na_impl<na> | |
80 | { | |
81 | template< typename U > struct apply | |
82 | { | |
83 | typedef U type; | |
84 | }; | |
85 | }; | |
86 | ||
87 | template< typename T, typename U > struct if_na | |
88 | : if_na_impl<T>::template apply<U> | |
89 | { | |
90 | }; | |
91 | #endif | |
92 | ||
93 | }} | |
94 | ||
95 | #endif // BOOST_MPL_AUX_NA_HPP_INCLUDED |