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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 | ||
748086b7 JJ |
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> |
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36 | |
37 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) | |
38 | ||
39 | // Define a nested type if some predicate holds. | |
40 | template<bool, typename> | |
41 | struct __enable_if | |
42 | { }; | |
43 | ||
44 | template<typename _Tp> | |
45 | struct __enable_if<true, _Tp> | |
46 | { typedef _Tp __type; }; | |
47 | ||
3454c18f | 48 | |
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49 | // Conditional expression for types. If true, first, if false, second. |
50 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
51 | struct __conditional_type | |
52 | { typedef _Iftrue __type; }; | |
53 | ||
54 | template<typename _Iftrue, typename _Iffalse> | |
55 | struct __conditional_type<false, _Iftrue, _Iffalse> | |
56 | { typedef _Iffalse __type; }; | |
57 | ||
58 | ||
3454c18f | 59 | // Given an integral builtin type, return the corresponding unsigned type. |
56f61bff | 60 | template<typename _Tp> |
105c6331 | 61 | struct __add_unsigned |
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62 | { |
63 | private: | |
56f61bff | 64 | typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; |
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65 | |
66 | public: | |
67 | typedef typename __if_type::__type __type; | |
68 | }; | |
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69 | |
70 | template<> | |
71 | struct __add_unsigned<char> | |
72 | { typedef unsigned char __type; }; | |
73 | ||
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74 | template<> |
75 | struct __add_unsigned<signed char> | |
76 | { typedef unsigned char __type; }; | |
77 | ||
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78 | template<> |
79 | struct __add_unsigned<short> | |
80 | { typedef unsigned short __type; }; | |
81 | ||
82 | template<> | |
83 | struct __add_unsigned<int> | |
84 | { typedef unsigned int __type; }; | |
85 | ||
86 | template<> | |
87 | struct __add_unsigned<long> | |
88 | { typedef unsigned long __type; }; | |
89 | ||
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90 | template<> |
91 | struct __add_unsigned<long long> | |
92 | { typedef unsigned long long __type; }; | |
105c6331 | 93 | |
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94 | // Declare but don't define. |
95 | template<> | |
96 | struct __add_unsigned<bool>; | |
97 | ||
98 | template<> | |
99 | struct __add_unsigned<wchar_t>; | |
100 | ||
101 | ||
102 | // Given an integral builtin type, return the corresponding signed type. | |
56f61bff | 103 | template<typename _Tp> |
105c6331 | 104 | struct __remove_unsigned |
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105 | { |
106 | private: | |
56f61bff | 107 | typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; |
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108 | |
109 | public: | |
110 | typedef typename __if_type::__type __type; | |
111 | }; | |
112 | ||
113 | template<> | |
114 | struct __remove_unsigned<char> | |
115 | { typedef signed char __type; }; | |
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116 | |
117 | template<> | |
118 | struct __remove_unsigned<unsigned char> | |
3454c18f | 119 | { typedef signed char __type; }; |
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120 | |
121 | template<> | |
122 | struct __remove_unsigned<unsigned short> | |
123 | { typedef short __type; }; | |
124 | ||
125 | template<> | |
126 | struct __remove_unsigned<unsigned int> | |
127 | { typedef int __type; }; | |
128 | ||
129 | template<> | |
130 | struct __remove_unsigned<unsigned long> | |
131 | { typedef long __type; }; | |
132 | ||
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133 | template<> |
134 | struct __remove_unsigned<unsigned long long> | |
135 | { typedef long long __type; }; | |
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136 | |
137 | // Declare but don't define. | |
138 | template<> | |
139 | struct __remove_unsigned<bool>; | |
140 | ||
141 | template<> | |
142 | struct __remove_unsigned<wchar_t>; | |
143 | ||
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144 | |
145 | // For use in string and vstring. | |
146 | template<typename _Type> | |
147 | inline bool | |
148 | __is_null_pointer(_Type* __ptr) | |
149 | { return __ptr == 0; } | |
150 | ||
151 | template<typename _Type> | |
152 | inline bool | |
153 | __is_null_pointer(_Type) | |
154 | { return false; } | |
155 | ||
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156 | |
157 | // For complex and cmath | |
158 | template<typename _Tp, bool = std::__is_integer<_Tp>::__value> | |
159 | struct __promote | |
160 | { typedef double __type; }; | |
161 | ||
162 | template<typename _Tp> | |
163 | struct __promote<_Tp, false> | |
164 | { typedef _Tp __type; }; | |
165 | ||
166 | template<typename _Tp, typename _Up> | |
167 | struct __promote_2 | |
168 | { | |
169 | private: | |
170 | typedef typename __promote<_Tp>::__type __type1; | |
171 | typedef typename __promote<_Up>::__type __type2; | |
172 | ||
173 | public: | |
174 | typedef __typeof__(__type1() + __type2()) __type; | |
175 | }; | |
176 | ||
177 | template<typename _Tp, typename _Up, typename _Vp> | |
178 | struct __promote_3 | |
179 | { | |
180 | private: | |
181 | typedef typename __promote<_Tp>::__type __type1; | |
182 | typedef typename __promote<_Up>::__type __type2; | |
183 | typedef typename __promote<_Vp>::__type __type3; | |
184 | ||
185 | public: | |
186 | typedef __typeof__(__type1() + __type2() + __type3()) __type; | |
187 | }; | |
188 | ||
189 | template<typename _Tp, typename _Up, typename _Vp, typename _Wp> | |
190 | struct __promote_4 | |
191 | { | |
192 | private: | |
193 | typedef typename __promote<_Tp>::__type __type1; | |
194 | typedef typename __promote<_Up>::__type __type2; | |
195 | typedef typename __promote<_Vp>::__type __type3; | |
196 | typedef typename __promote<_Wp>::__type __type4; | |
197 | ||
198 | public: | |
199 | typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type; | |
200 | }; | |
201 | ||
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202 | _GLIBCXX_END_NAMESPACE |
203 | ||
204 | #endif |