summaryrefslogtreecommitdiff
path: root/libcutl/cutl/details/boost/mpl/aux_/na.hpp
blob: efbd9bc502cf24fc44b75d7e59ad9ea592bdeec7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95

#ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED
#define BOOST_MPL_AUX_NA_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2001-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.

// $Id: na.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
// $Revision: 49267 $

#include <cutl/details/boost/mpl/bool.hpp>
#include <cutl/details/boost/mpl/aux_/na_fwd.hpp>
#include <cutl/details/boost/mpl/aux_/config/msvc.hpp>
#include <cutl/details/boost/mpl/aux_/config/ctps.hpp>

namespace cutl_details_boost { namespace mpl {

template< typename T >
struct is_na
    : false_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
    using false_::value;
#endif
};

template<>
struct is_na<na>
    : true_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
    using true_::value;
#endif
};

template< typename T >
struct is_not_na
    : true_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
    using true_::value;
#endif
};

template<>
struct is_not_na<na>
    : false_
{
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
    using false_::value;
#endif
};

#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template< typename T, typename U > struct if_na
{
    typedef T type;
};

template< typename U > struct if_na<na,U>
{
    typedef U type;
};
#else
template< typename T > struct if_na_impl
{
    template< typename U > struct apply
    {
        typedef T type;
    };
};

template<> struct if_na_impl<na>
{
    template< typename U > struct apply
    {
        typedef U type;
    };
};

template< typename T, typename U > struct if_na
    : if_na_impl<T>::template apply<U>
{
};
#endif

}}

#endif // BOOST_MPL_AUX_NA_HPP_INCLUDED