blob: b75381c5b36af92e67bc8a2b7666a0e3585d32de (
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*=============================================================================
Copyright (c) 2007 Tobias Schwinger
Use modification and distribution are subject to 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).
==============================================================================*/
#if !defined(BOOST_FUSION_SUPPORT_DEDUCE_HPP_INCLUDED)
#define BOOST_FUSION_SUPPORT_DEDUCE_HPP_INCLUDED
#include <boost/fusion/support/config.hpp>
#include <boost/ref.hpp>
#ifndef BOOST_NO_CXX11_HDR_FUNCTIONAL
#include <functional>
#endif
namespace boost { namespace fusion { namespace traits
{
template <typename T> struct deduce;
//----- ---- --- -- - - - -
// Non-references pass unchanged
template <typename T>
struct deduce
{
typedef T type;
};
template <typename T>
struct deduce<T const>
{
typedef T type;
};
template <typename T>
struct deduce<T volatile>
{
typedef T type;
};
template <typename T>
struct deduce<T const volatile>
{
typedef T type;
};
// Keep references on mutable LValues
template <typename T>
struct deduce<T &>
{
typedef T & type;
};
template <typename T>
struct deduce<T volatile&>
{
typedef T volatile& type;
};
// Store away potential RValues
template <typename T>
struct deduce<T const&>
{
typedef T type;
};
template <typename T>
struct deduce<T const volatile&>
{
typedef T type;
};
// Unwrap Boost.RefS (referencee cv is deduced)
template <typename T>
struct deduce<reference_wrapper<T> & >
{
typedef T& type;
};
template <typename T>
struct deduce<reference_wrapper<T> const & >
{
typedef T& type;
};
// Also unwrap C++11 std::ref if available (referencee cv is deduced)
#ifndef BOOST_NO_CXX11_HDR_FUNCTIONAL
template <typename T>
struct deduce<std::reference_wrapper<T> &>
{
typedef T& type;
};
template <typename T>
struct deduce<std::reference_wrapper<T> const &>
{
typedef T& type;
};
#endif
// Keep references on arrays, even if const
template <typename T, int N>
struct deduce<T(&)[N]>
{
typedef T(&type)[N];
};
template <typename T, int N>
struct deduce<volatile T(&)[N]>
{
typedef volatile T(&type)[N];
};
template <typename T, int N>
struct deduce<const T(&)[N]>
{
typedef const T(&type)[N];
};
template <typename T, int N>
struct deduce<const volatile T(&)[N]>
{
typedef const volatile T(&type)[N];
};
}}}
#endif
|
