blob: 314250c6436d6e96f24ec33517d0c2fbae07e626 (
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: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
// $Revision: 49267 $
#include <boost/mpl/bool.hpp>
#include <boost/mpl/aux_/na_fwd.hpp>
#include <boost/mpl/aux_/config/msvc.hpp>
#include <boost/mpl/aux_/config/ctps.hpp>
namespace 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
|