Eric Fiselier | 8d5cbd7 | 2016-04-20 00:14:32 +0000 | [diff] [blame^] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| 11 | |
| 12 | // type_traits |
| 13 | |
| 14 | // is_callable |
| 15 | |
| 16 | // Most testing of is_callable is done within the [meta.trans.other] result_of |
| 17 | // tests. |
| 18 | |
| 19 | #include <type_traits> |
| 20 | #include <functional> |
| 21 | |
| 22 | #include "test_macros.h" |
| 23 | |
| 24 | struct Tag {}; |
| 25 | struct DerFromTag : Tag {}; |
| 26 | |
| 27 | struct Implicit { |
| 28 | Implicit(int) {} |
| 29 | }; |
| 30 | |
| 31 | struct Explicit { |
| 32 | explicit Explicit(int) {} |
| 33 | }; |
| 34 | |
| 35 | struct NotCallableWithInt { |
| 36 | int operator()(int) = delete; |
| 37 | int operator()(Tag) { return 42; } |
| 38 | }; |
| 39 | |
| 40 | int main() |
| 41 | { |
| 42 | { |
| 43 | using Fn = int(Tag::*)(int); |
| 44 | using RFn = int(Tag::*)(int) &&; |
| 45 | // INVOKE bullet 1, 2 and 3 |
| 46 | { |
| 47 | // Bullet 1 |
| 48 | static_assert(std::is_callable<Fn(Tag&, int)>::value); |
| 49 | static_assert(std::is_callable<Fn(DerFromTag&, int)>::value); |
| 50 | static_assert(std::is_callable<RFn(Tag&&, int)>::value); |
| 51 | static_assert(!std::is_callable<RFn(Tag&, int)>::value); |
| 52 | static_assert(!std::is_callable<Fn(Tag&)>::value); |
| 53 | static_assert(!std::is_callable<Fn(Tag const&, int)>::value); |
| 54 | } |
| 55 | { |
| 56 | // Bullet 2 |
| 57 | using T = std::reference_wrapper<Tag>; |
| 58 | using DT = std::reference_wrapper<DerFromTag>; |
| 59 | using CT = std::reference_wrapper<const Tag>; |
| 60 | static_assert(std::is_callable<Fn(T&, int)>::value); |
| 61 | static_assert(std::is_callable<Fn(DT&, int)>::value); |
| 62 | static_assert(std::is_callable<Fn(const T&, int)>::value); |
| 63 | static_assert(std::is_callable<Fn(T&&, int)>::value); |
| 64 | static_assert(!std::is_callable<Fn(CT&, int)>::value); |
| 65 | static_assert(!std::is_callable<RFn(T, int)>::value); |
| 66 | } |
| 67 | { |
| 68 | // Bullet 3 |
| 69 | using T = Tag*; |
| 70 | using DT = DerFromTag*; |
| 71 | using CT = const Tag*; |
| 72 | using ST = std::unique_ptr<Tag>; |
| 73 | static_assert(std::is_callable<Fn(T&, int)>::value); |
| 74 | static_assert(std::is_callable<Fn(DT&, int)>::value); |
| 75 | static_assert(std::is_callable<Fn(const T&, int)>::value); |
| 76 | static_assert(std::is_callable<Fn(T&&, int)>::value); |
| 77 | static_assert(std::is_callable<Fn(ST, int)>::value); |
| 78 | static_assert(!std::is_callable<Fn(CT&, int)>::value); |
| 79 | static_assert(!std::is_callable<RFn(T, int)>::value); |
| 80 | } |
| 81 | } |
| 82 | { |
| 83 | // Bullets 4, 5 and 6 |
| 84 | using Fn = int (Tag::*); |
| 85 | static_assert(!std::is_callable<Fn()>::value); |
| 86 | { |
| 87 | // Bullet 4 |
| 88 | static_assert(std::is_callable<Fn(Tag&)>::value); |
| 89 | static_assert(std::is_callable<Fn(DerFromTag&)>::value); |
| 90 | static_assert(std::is_callable<Fn(Tag&&)>::value); |
| 91 | static_assert(std::is_callable<Fn(Tag const&)>::value); |
| 92 | } |
| 93 | { |
| 94 | // Bullet 5 |
| 95 | using T = std::reference_wrapper<Tag>; |
| 96 | using DT = std::reference_wrapper<DerFromTag>; |
| 97 | using CT = std::reference_wrapper<const Tag>; |
| 98 | static_assert(std::is_callable<Fn(T&)>::value); |
| 99 | static_assert(std::is_callable<Fn(DT&)>::value); |
| 100 | static_assert(std::is_callable<Fn(const T&)>::value); |
| 101 | static_assert(std::is_callable<Fn(T&&)>::value); |
| 102 | static_assert(std::is_callable<Fn(CT&)>::value); |
| 103 | } |
| 104 | { |
| 105 | // Bullet 6 |
| 106 | using T = Tag*; |
| 107 | using DT = DerFromTag*; |
| 108 | using CT = const Tag*; |
| 109 | using ST = std::unique_ptr<Tag>; |
| 110 | static_assert(std::is_callable<Fn(T&)>::value); |
| 111 | static_assert(std::is_callable<Fn(DT&)>::value); |
| 112 | static_assert(std::is_callable<Fn(const T&)>::value); |
| 113 | static_assert(std::is_callable<Fn(T&&)>::value); |
| 114 | static_assert(std::is_callable<Fn(ST)>::value); |
| 115 | static_assert(std::is_callable<Fn(CT&)>::value); |
| 116 | } |
| 117 | } |
| 118 | { |
| 119 | // INVOKE bullet 7 |
| 120 | { |
| 121 | // Function pointer |
| 122 | using Fp = void(*)(Tag&, int); |
| 123 | static_assert(std::is_callable<Fp(Tag&, int)>::value); |
| 124 | static_assert(std::is_callable<Fp(DerFromTag&, int)>::value); |
| 125 | static_assert(!std::is_callable<Fp(const Tag&, int)>::value); |
| 126 | static_assert(!std::is_callable<Fp()>::value); |
| 127 | static_assert(!std::is_callable<Fp(Tag&)>::value); |
| 128 | } |
| 129 | { |
| 130 | // Function reference |
| 131 | using Fp = void(&)(Tag&, int); |
| 132 | static_assert(std::is_callable<Fp(Tag&, int)>::value); |
| 133 | static_assert(std::is_callable<Fp(DerFromTag&, int)>::value); |
| 134 | static_assert(!std::is_callable<Fp(const Tag&, int)>::value); |
| 135 | static_assert(!std::is_callable<Fp()>::value); |
| 136 | static_assert(!std::is_callable<Fp(Tag&)>::value); |
| 137 | } |
| 138 | { |
| 139 | // Function object |
| 140 | using Fn = NotCallableWithInt; |
| 141 | static_assert(std::is_callable<Fn(Tag)>::value, ""); |
| 142 | static_assert(!std::is_callable<Fn(int)>::value, ""); |
| 143 | } |
| 144 | } |
| 145 | { |
| 146 | // Check that the conversion to the return type is properly checked |
| 147 | using Fn = int(*)(); |
| 148 | static_assert(std::is_callable<Fn(), Implicit>::value); |
| 149 | static_assert(std::is_callable<Fn(), double>::value); |
| 150 | static_assert(std::is_callable<Fn(), const volatile void>::value); |
| 151 | static_assert(!std::is_callable<Fn(), Explicit>::value); |
| 152 | } |
| 153 | { |
| 154 | // Check for is_callable_v |
| 155 | using Fn = void(*)(); |
| 156 | static_assert(std::is_callable_v<Fn()>); |
| 157 | static_assert(!std::is_callable_v<Fn(int)>); |
| 158 | } |
| 159 | } |