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7adcbafe | 1 | // Copyright (C) 2020-2022 Free Software Foundation, Inc. |
02e32295 MK |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | // | |
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | // | |
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | #ifndef VC_TESTS_METAHELPERS_H_ | |
19 | #define VC_TESTS_METAHELPERS_H_ | |
20 | ||
21 | #include <functional> | |
22 | #include <type_traits> | |
23 | #include <utility> | |
24 | ||
25 | namespace vir | |
26 | { | |
27 | namespace test | |
28 | { | |
29 | template <class A, class B, class Op> | |
30 | constexpr bool | |
31 | operator_is_substitution_failure_impl(float) | |
32 | { return true; } | |
33 | ||
34 | template <class A, class B, class Op> | |
35 | constexpr typename std::conditional<true, bool, decltype( | |
36 | Op()(std::declval<A>(), std::declval<B>()))>::type | |
37 | operator_is_substitution_failure_impl(int) | |
38 | { return false; } | |
39 | ||
40 | template <class... Ts> | |
41 | constexpr bool | |
42 | operator_is_substitution_failure() | |
43 | { return operator_is_substitution_failure_impl<Ts...>(int()); } | |
44 | ||
45 | template <class... Args, class F> | |
46 | constexpr auto | |
47 | sfinae_is_callable_impl(int, F &&f) -> typename std::conditional< | |
48 | true, std::true_type, | |
49 | decltype(std::forward<F>(f)(std::declval<Args>()...))>::type; | |
50 | ||
51 | template <class... Args, class F> | |
52 | constexpr std::false_type | |
53 | sfinae_is_callable_impl(float, const F &); | |
54 | ||
55 | template <class... Args, class F> | |
56 | constexpr bool | |
57 | sfinae_is_callable(F &&) | |
58 | { | |
59 | return decltype( | |
60 | sfinae_is_callable_impl<Args...>(int(), std::declval<F>()))::value; | |
61 | } | |
62 | ||
63 | template <class... Args, class F> | |
64 | constexpr auto sfinae_is_callable_t(F &&f) | |
65 | -> decltype(sfinae_is_callable_impl<Args...>(int(), std::declval<F>())); | |
66 | ||
67 | template <class A, class B> | |
68 | constexpr bool | |
69 | has_less_bits() | |
70 | { return std::__digits_v<A> < std::__digits_v<B>; } | |
71 | ||
72 | } // namespace test | |
73 | } // namespace vir | |
74 | ||
75 | struct assignment | |
76 | { | |
77 | template <class A, class B> | |
78 | constexpr decltype(std::declval<A>() = std::declval<B>()) | |
79 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
80 | std::forward<A>(a) = std::forward<B>(b))) | |
81 | { return std::forward<A>(a) = std::forward<B>(b); } | |
82 | }; | |
83 | ||
84 | struct bit_shift_left | |
85 | { | |
86 | template <class A, class B> | |
87 | constexpr decltype(std::declval<A>() << std::declval<B>()) | |
88 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
89 | std::forward<A>(a) << std::forward<B>(b))) | |
90 | { return std::forward<A>(a) << std::forward<B>(b); } | |
91 | }; | |
92 | ||
93 | struct bit_shift_right | |
94 | { | |
95 | template <class A, class B> | |
96 | constexpr decltype(std::declval<A>() >> std::declval<B>()) | |
97 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
98 | std::forward<A>(a) >> std::forward<B>(b))) | |
99 | { return std::forward<A>(a) >> std::forward<B>(b); } | |
100 | }; | |
101 | ||
102 | struct assign_modulus | |
103 | { | |
104 | template <class A, class B> | |
105 | constexpr decltype(std::declval<A>() %= std::declval<B>()) | |
106 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
107 | std::forward<A>(a) %= std::forward<B>(b))) | |
108 | { return std::forward<A>(a) %= std::forward<B>(b); } | |
109 | }; | |
110 | ||
111 | struct assign_bit_and | |
112 | { | |
113 | template <class A, class B> | |
114 | constexpr decltype(std::declval<A>() &= std::declval<B>()) | |
115 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
116 | std::forward<A>(a) &= std::forward<B>(b))) | |
117 | { return std::forward<A>(a) &= std::forward<B>(b); } | |
118 | }; | |
119 | ||
120 | struct assign_bit_or | |
121 | { | |
122 | template <class A, class B> | |
123 | constexpr decltype(std::declval<A>() |= std::declval<B>()) | |
124 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
125 | std::forward<A>(a) |= std::forward<B>(b))) | |
126 | { return std::forward<A>(a) |= std::forward<B>(b); } | |
127 | }; | |
128 | ||
129 | struct assign_bit_xor | |
130 | { | |
131 | template <class A, class B> | |
132 | constexpr decltype(std::declval<A>() ^= std::declval<B>()) | |
133 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
134 | std::forward<A>(a) ^= std::forward<B>(b))) | |
135 | { return std::forward<A>(a) ^= std::forward<B>(b); } | |
136 | }; | |
137 | ||
138 | struct assign_bit_shift_left | |
139 | { | |
140 | template <class A, class B> | |
141 | constexpr decltype(std::declval<A>() <<= std::declval<B>()) | |
142 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
143 | std::forward<A>(a) <<= std::forward<B>(b))) | |
144 | { return std::forward<A>(a) <<= std::forward<B>(b); } | |
145 | }; | |
146 | ||
147 | struct assign_bit_shift_right | |
148 | { | |
149 | template <class A, class B> | |
150 | constexpr decltype(std::declval<A>() >>= std::declval<B>()) | |
151 | operator()(A &&a, B &&b) const noexcept(noexcept( | |
152 | std::forward<A>(a) >>= std::forward<B>(b))) | |
153 | { return std::forward<A>(a) >>= std::forward<B>(b); } | |
154 | }; | |
155 | ||
156 | template <class A, class B, class Op = std::plus<>> | |
157 | constexpr bool is_substitution_failure | |
158 | = vir::test::operator_is_substitution_failure<A, B, Op>(); | |
159 | ||
160 | using vir::test::sfinae_is_callable; | |
161 | ||
162 | using vir::test::has_less_bits; | |
163 | ||
164 | #endif // VC_TESTS_METAHELPERS_H_ |