Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +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 | // <functional> |
| 13 | |
| 14 | // template <class F, class ...Args> |
| 15 | // result_of_t<F&&(Args&&...)> invoke(F&&, Args&&...); |
| 16 | |
| 17 | /// C++14 [func.def] 20.9.0 |
| 18 | /// (1) The following definitions apply to this Clause: |
| 19 | /// (2) A call signature is the name of a return type followed by a parenthesized |
| 20 | /// comma-separated list of zero or more argument types. |
| 21 | /// (3) A callable type is a function object type (20.9) or a pointer to member. |
| 22 | /// (4) A callable object is an object of a callable type. |
| 23 | /// (5) A call wrapper type is a type that holds a callable object and supports |
| 24 | /// a call operation that forwards to that object. |
| 25 | /// (6) A call wrapper is an object of a call wrapper type. |
| 26 | /// (7) A target object is the callable object held by a call wrapper. |
| 27 | |
| 28 | /// C++14 [func.require] 20.9.1 |
| 29 | /// |
| 30 | /// Define INVOKE (f, t1, t2, ..., tN) as follows: |
Eric Fiselier | 83de101 | 2015-07-14 20:45:48 +0000 | [diff] [blame] | 31 | /// (1.1) - (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is an object of |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 32 | /// type T or a reference to an object of type T or a reference to an object of a type derived from T; |
Eric Fiselier | 83de101 | 2015-07-14 20:45:48 +0000 | [diff] [blame] | 33 | /// (1.2) - ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is not one of |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 34 | /// the types described in the previous item; |
Eric Fiselier | 83de101 | 2015-07-14 20:45:48 +0000 | [diff] [blame] | 35 | /// (1.3) - t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is an object of type T or a |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 36 | /// reference to an object of type T or a reference to an object of a type derived from T; |
Eric Fiselier | 83de101 | 2015-07-14 20:45:48 +0000 | [diff] [blame] | 37 | /// (1.4) - (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1 is not one of the types |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 38 | /// described in the previous item; |
Eric Fiselier | 83de101 | 2015-07-14 20:45:48 +0000 | [diff] [blame] | 39 | /// (1.5) - f(t1, t2, ..., tN) in all other cases. |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 40 | |
| 41 | #include <functional> |
| 42 | #include <type_traits> |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 43 | #include <cassert> |
| 44 | |
| 45 | struct NonCopyable { |
| 46 | NonCopyable() {} |
| 47 | private: |
| 48 | NonCopyable(NonCopyable const&) = delete; |
| 49 | NonCopyable& operator=(NonCopyable const&) = delete; |
| 50 | }; |
| 51 | |
| 52 | struct TestClass { |
| 53 | explicit TestClass(int x) : data(x) {} |
| 54 | |
| 55 | int& operator()(NonCopyable&&) & { return data; } |
| 56 | int const& operator()(NonCopyable&&) const & { return data; } |
| 57 | int volatile& operator()(NonCopyable&&) volatile & { return data; } |
| 58 | int const volatile& operator()(NonCopyable&&) const volatile & { return data; } |
| 59 | |
| 60 | int&& operator()(NonCopyable&&) && { return std::move(data); } |
| 61 | int const&& operator()(NonCopyable&&) const && { return std::move(data); } |
| 62 | int volatile&& operator()(NonCopyable&&) volatile && { return std::move(data); } |
| 63 | int const volatile&& operator()(NonCopyable&&) const volatile && { return std::move(data); } |
| 64 | |
| 65 | int data; |
| 66 | private: |
| 67 | TestClass(TestClass const&) = delete; |
| 68 | TestClass& operator=(TestClass const&) = delete; |
| 69 | }; |
| 70 | |
| 71 | struct DerivedFromTestClass : public TestClass { |
| 72 | explicit DerivedFromTestClass(int x) : TestClass(x) {} |
| 73 | }; |
| 74 | |
| 75 | int& foo(NonCopyable&&) { |
| 76 | static int data = 42; |
| 77 | return data; |
| 78 | } |
| 79 | |
| 80 | template <class Signature, class Expect, class Functor> |
| 81 | void test_b12(Functor&& f) { |
| 82 | // Create the callable object. |
| 83 | typedef Signature TestClass::*ClassFunc; |
| 84 | ClassFunc func_ptr = &TestClass::operator(); |
| 85 | |
| 86 | // Create the dummy arg. |
| 87 | NonCopyable arg; |
| 88 | |
| 89 | // Check that the deduced return type of invoke is what is expected. |
| 90 | typedef decltype( |
| 91 | std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg)) |
| 92 | ) DeducedReturnType; |
| 93 | static_assert((std::is_same<DeducedReturnType, Expect>::value), ""); |
| 94 | |
| 95 | // Check that result_of_t matches Expect. |
| 96 | typedef typename std::result_of<ClassFunc&&(Functor&&, NonCopyable&&)>::type |
| 97 | ResultOfReturnType; |
| 98 | static_assert((std::is_same<ResultOfReturnType, Expect>::value), ""); |
| 99 | |
| 100 | // Run invoke and check the return value. |
| 101 | DeducedReturnType ret = |
| 102 | std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg)); |
| 103 | assert(ret == 42); |
| 104 | } |
| 105 | |
| 106 | template <class Expect, class Functor> |
| 107 | void test_b34(Functor&& f) { |
| 108 | // Create the callable object. |
| 109 | typedef int TestClass::*ClassFunc; |
| 110 | ClassFunc func_ptr = &TestClass::data; |
| 111 | |
| 112 | // Check that the deduced return type of invoke is what is expected. |
| 113 | typedef decltype( |
| 114 | std::invoke(func_ptr, std::forward<Functor>(f)) |
| 115 | ) DeducedReturnType; |
| 116 | static_assert((std::is_same<DeducedReturnType, Expect>::value), ""); |
| 117 | |
| 118 | // Check that result_of_t matches Expect. |
| 119 | typedef typename std::result_of<ClassFunc&&(Functor&&)>::type |
| 120 | ResultOfReturnType; |
| 121 | static_assert((std::is_same<ResultOfReturnType, Expect>::value), ""); |
| 122 | |
| 123 | // Run invoke and check the return value. |
| 124 | DeducedReturnType ret = |
| 125 | std::invoke(func_ptr, std::forward<Functor>(f)); |
| 126 | assert(ret == 42); |
| 127 | } |
| 128 | |
| 129 | template <class Expect, class Functor> |
| 130 | void test_b5(Functor&& f) { |
| 131 | NonCopyable arg; |
| 132 | |
| 133 | // Check that the deduced return type of invoke is what is expected. |
| 134 | typedef decltype( |
| 135 | std::invoke(std::forward<Functor>(f), std::move(arg)) |
| 136 | ) DeducedReturnType; |
| 137 | static_assert((std::is_same<DeducedReturnType, Expect>::value), ""); |
| 138 | |
| 139 | // Check that result_of_t matches Expect. |
| 140 | typedef typename std::result_of<Functor&&(NonCopyable&&)>::type |
| 141 | ResultOfReturnType; |
| 142 | static_assert((std::is_same<ResultOfReturnType, Expect>::value), ""); |
| 143 | |
| 144 | // Run invoke and check the return value. |
| 145 | DeducedReturnType ret = std::invoke(std::forward<Functor>(f), std::move(arg)); |
| 146 | assert(ret == 42); |
| 147 | } |
| 148 | |
| 149 | void bullet_one_two_tests() { |
| 150 | { |
| 151 | TestClass cl(42); |
| 152 | test_b12<int&(NonCopyable&&) &, int&>(cl); |
| 153 | test_b12<int const&(NonCopyable&&) const &, int const&>(cl); |
| 154 | test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl); |
| 155 | test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl); |
| 156 | |
| 157 | test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl)); |
| 158 | test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl)); |
| 159 | test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl)); |
| 160 | test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl)); |
| 161 | } |
| 162 | { |
| 163 | DerivedFromTestClass cl(42); |
| 164 | test_b12<int&(NonCopyable&&) &, int&>(cl); |
| 165 | test_b12<int const&(NonCopyable&&) const &, int const&>(cl); |
| 166 | test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl); |
| 167 | test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl); |
| 168 | |
| 169 | test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl)); |
| 170 | test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl)); |
| 171 | test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl)); |
| 172 | test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl)); |
| 173 | } |
| 174 | { |
| 175 | TestClass cl_obj(42); |
| 176 | TestClass *cl = &cl_obj; |
| 177 | test_b12<int&(NonCopyable&&) &, int&>(cl); |
| 178 | test_b12<int const&(NonCopyable&&) const &, int const&>(cl); |
| 179 | test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl); |
| 180 | test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl); |
| 181 | } |
| 182 | { |
| 183 | DerivedFromTestClass cl_obj(42); |
| 184 | DerivedFromTestClass *cl = &cl_obj; |
| 185 | test_b12<int&(NonCopyable&&) &, int&>(cl); |
| 186 | test_b12<int const&(NonCopyable&&) const &, int const&>(cl); |
| 187 | test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl); |
| 188 | test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | void bullet_three_four_tests() { |
| 193 | { |
| 194 | typedef TestClass Fn; |
| 195 | Fn cl(42); |
| 196 | test_b34<int&>(cl); |
| 197 | test_b34<int const&>(static_cast<Fn const&>(cl)); |
| 198 | test_b34<int volatile&>(static_cast<Fn volatile&>(cl)); |
| 199 | test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl)); |
| 200 | |
| 201 | test_b34<int&&>(static_cast<Fn &&>(cl)); |
| 202 | test_b34<int const&&>(static_cast<Fn const&&>(cl)); |
| 203 | test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl)); |
| 204 | test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl)); |
| 205 | } |
| 206 | { |
| 207 | typedef DerivedFromTestClass Fn; |
| 208 | Fn cl(42); |
| 209 | test_b34<int&>(cl); |
| 210 | test_b34<int const&>(static_cast<Fn const&>(cl)); |
| 211 | test_b34<int volatile&>(static_cast<Fn volatile&>(cl)); |
| 212 | test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl)); |
| 213 | |
| 214 | test_b34<int&&>(static_cast<Fn &&>(cl)); |
| 215 | test_b34<int const&&>(static_cast<Fn const&&>(cl)); |
| 216 | test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl)); |
| 217 | test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl)); |
| 218 | } |
| 219 | { |
| 220 | typedef TestClass Fn; |
Eric Fiselier | 22dff53 | 2015-07-14 20:16:15 +0000 | [diff] [blame] | 221 | Fn cl_obj(42); |
| 222 | Fn* cl = &cl_obj; |
| 223 | test_b34<int&>(cl); |
| 224 | test_b34<int const&>(static_cast<Fn const*>(cl)); |
| 225 | test_b34<int volatile&>(static_cast<Fn volatile*>(cl)); |
| 226 | test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl)); |
| 227 | } |
| 228 | { |
| 229 | typedef DerivedFromTestClass Fn; |
| 230 | Fn cl_obj(42); |
| 231 | Fn* cl = &cl_obj; |
| 232 | test_b34<int&>(cl); |
| 233 | test_b34<int const&>(static_cast<Fn const*>(cl)); |
| 234 | test_b34<int volatile&>(static_cast<Fn volatile*>(cl)); |
| 235 | test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl)); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | void bullet_five_tests() { |
| 240 | using FooType = int&(NonCopyable&&); |
| 241 | { |
| 242 | FooType& fn = foo; |
| 243 | test_b5<int &>(fn); |
| 244 | } |
| 245 | { |
| 246 | FooType* fn = foo; |
| 247 | test_b5<int &>(fn); |
| 248 | } |
| 249 | { |
| 250 | typedef TestClass Fn; |
| 251 | Fn cl(42); |
| 252 | test_b5<int&>(cl); |
| 253 | test_b5<int const&>(static_cast<Fn const&>(cl)); |
| 254 | test_b5<int volatile&>(static_cast<Fn volatile&>(cl)); |
| 255 | test_b5<int const volatile&>(static_cast<Fn const volatile &>(cl)); |
| 256 | |
| 257 | test_b5<int&&>(static_cast<Fn &&>(cl)); |
| 258 | test_b5<int const&&>(static_cast<Fn const&&>(cl)); |
| 259 | test_b5<int volatile&&>(static_cast<Fn volatile&&>(cl)); |
| 260 | test_b5<int const volatile&&>(static_cast<Fn const volatile&&>(cl)); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | int main() { |
| 265 | bullet_one_two_tests(); |
| 266 | bullet_three_four_tests(); |
| 267 | bullet_five_tests(); |
| 268 | } |