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1 | // -*- C++ -*- |
2 | ||
748086b7 | 3 | // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the terms | |
7 | // of the GNU General Public License as published by the Free Software | |
748086b7 | 8 | // Foundation; either version 3, or (at your option) any later |
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9 | // version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, but | |
12 | // WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | // General Public License for more details. | |
15 | ||
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16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
105c6331 | 24 | |
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25 | /** @file ext/type_traits.h |
26 | * This file is a GNU extension to the Standard C++ Library. | |
27 | */ | |
28 | ||
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29 | #ifndef _EXT_TYPE_TRAITS |
30 | #define _EXT_TYPE_TRAITS 1 | |
31 | ||
32 | #pragma GCC system_header | |
33 | ||
b3726dab | 34 | #include <bits/c++config.h> |
a1adedd0 | 35 | #include <bits/cpp_type_traits.h> |
105c6331 | 36 | |
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37 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
38 | { | |
39 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
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40 | |
41 | // Define a nested type if some predicate holds. | |
42 | template<bool, typename> | |
43 | struct __enable_if | |
44 | { }; | |
45 | ||
46 | template<typename _Tp> | |
47 | struct __enable_if<true, _Tp> | |
48 | { typedef _Tp __type; }; | |
49 | ||
3454c18f | 50 | |
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51 | // Conditional expression for types. If true, first, if false, second. |
52 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
53 | struct __conditional_type | |
54 | { typedef _Iftrue __type; }; | |
55 | ||
56 | template<typename _Iftrue, typename _Iffalse> | |
57 | struct __conditional_type<false, _Iftrue, _Iffalse> | |
58 | { typedef _Iffalse __type; }; | |
59 | ||
60 | ||
3454c18f | 61 | // Given an integral builtin type, return the corresponding unsigned type. |
56f61bff | 62 | template<typename _Tp> |
105c6331 | 63 | struct __add_unsigned |
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64 | { |
65 | private: | |
56f61bff | 66 | typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; |
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67 | |
68 | public: | |
69 | typedef typename __if_type::__type __type; | |
70 | }; | |
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71 | |
72 | template<> | |
73 | struct __add_unsigned<char> | |
74 | { typedef unsigned char __type; }; | |
75 | ||
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76 | template<> |
77 | struct __add_unsigned<signed char> | |
78 | { typedef unsigned char __type; }; | |
79 | ||
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80 | template<> |
81 | struct __add_unsigned<short> | |
82 | { typedef unsigned short __type; }; | |
83 | ||
84 | template<> | |
85 | struct __add_unsigned<int> | |
86 | { typedef unsigned int __type; }; | |
87 | ||
88 | template<> | |
89 | struct __add_unsigned<long> | |
90 | { typedef unsigned long __type; }; | |
91 | ||
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92 | template<> |
93 | struct __add_unsigned<long long> | |
94 | { typedef unsigned long long __type; }; | |
105c6331 | 95 | |
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96 | // Declare but don't define. |
97 | template<> | |
98 | struct __add_unsigned<bool>; | |
99 | ||
100 | template<> | |
101 | struct __add_unsigned<wchar_t>; | |
102 | ||
103 | ||
104 | // Given an integral builtin type, return the corresponding signed type. | |
56f61bff | 105 | template<typename _Tp> |
105c6331 | 106 | struct __remove_unsigned |
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107 | { |
108 | private: | |
56f61bff | 109 | typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; |
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110 | |
111 | public: | |
112 | typedef typename __if_type::__type __type; | |
113 | }; | |
114 | ||
115 | template<> | |
116 | struct __remove_unsigned<char> | |
117 | { typedef signed char __type; }; | |
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118 | |
119 | template<> | |
120 | struct __remove_unsigned<unsigned char> | |
3454c18f | 121 | { typedef signed char __type; }; |
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122 | |
123 | template<> | |
124 | struct __remove_unsigned<unsigned short> | |
125 | { typedef short __type; }; | |
126 | ||
127 | template<> | |
128 | struct __remove_unsigned<unsigned int> | |
129 | { typedef int __type; }; | |
130 | ||
131 | template<> | |
132 | struct __remove_unsigned<unsigned long> | |
133 | { typedef long __type; }; | |
134 | ||
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135 | template<> |
136 | struct __remove_unsigned<unsigned long long> | |
137 | { typedef long long __type; }; | |
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138 | |
139 | // Declare but don't define. | |
140 | template<> | |
141 | struct __remove_unsigned<bool>; | |
142 | ||
143 | template<> | |
144 | struct __remove_unsigned<wchar_t>; | |
145 | ||
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146 | |
147 | // For use in string and vstring. | |
148 | template<typename _Type> | |
149 | inline bool | |
150 | __is_null_pointer(_Type* __ptr) | |
151 | { return __ptr == 0; } | |
152 | ||
153 | template<typename _Type> | |
154 | inline bool | |
155 | __is_null_pointer(_Type) | |
156 | { return false; } | |
157 | ||
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158 | |
159 | // For complex and cmath | |
160 | template<typename _Tp, bool = std::__is_integer<_Tp>::__value> | |
161 | struct __promote | |
162 | { typedef double __type; }; | |
163 | ||
164 | template<typename _Tp> | |
165 | struct __promote<_Tp, false> | |
166 | { typedef _Tp __type; }; | |
167 | ||
168 | template<typename _Tp, typename _Up> | |
169 | struct __promote_2 | |
170 | { | |
171 | private: | |
172 | typedef typename __promote<_Tp>::__type __type1; | |
173 | typedef typename __promote<_Up>::__type __type2; | |
174 | ||
175 | public: | |
176 | typedef __typeof__(__type1() + __type2()) __type; | |
177 | }; | |
178 | ||
179 | template<typename _Tp, typename _Up, typename _Vp> | |
180 | struct __promote_3 | |
181 | { | |
182 | private: | |
183 | typedef typename __promote<_Tp>::__type __type1; | |
184 | typedef typename __promote<_Up>::__type __type2; | |
185 | typedef typename __promote<_Vp>::__type __type3; | |
186 | ||
187 | public: | |
188 | typedef __typeof__(__type1() + __type2() + __type3()) __type; | |
189 | }; | |
190 | ||
191 | template<typename _Tp, typename _Up, typename _Vp, typename _Wp> | |
192 | struct __promote_4 | |
193 | { | |
194 | private: | |
195 | typedef typename __promote<_Tp>::__type __type1; | |
196 | typedef typename __promote<_Up>::__type __type2; | |
197 | typedef typename __promote<_Vp>::__type __type3; | |
198 | typedef typename __promote<_Wp>::__type __type4; | |
199 | ||
200 | public: | |
201 | typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type; | |
202 | }; | |
203 | ||
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204 | _GLIBCXX_END_NAMESPACE_VERSION |
205 | } // namespace | |
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206 | |
207 | #endif |