| 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // type_traits |
| 10 | |
| 11 | // is_assignable |
| 12 | |
| 13 | #include <type_traits> |
| 14 | #include "test_macros.h" |
| 15 | |
| 16 | struct A |
| 17 | { |
| 18 | }; |
| 19 | |
| 20 | struct B |
| 21 | { |
| 22 | void operator=(A); |
| 23 | }; |
| 24 | |
| 25 | template <class T, class U> |
| 26 | void test_is_assignable() |
| 27 | { |
| 28 | static_assert(( std::is_assignable<T, U>::value), "" ); |
| 29 | #if TEST_STD_VER > 14 |
| 30 | static_assert( std::is_assignable_v<T, U>, "" ); |
| 31 | #endif |
| 32 | } |
| 33 | |
| 34 | template <class T, class U> |
| 35 | void test_is_not_assignable() |
| 36 | { |
| 37 | static_assert((!std::is_assignable<T, U>::value), "" ); |
| 38 | #if TEST_STD_VER > 14 |
| 39 | static_assert( !std::is_assignable_v<T, U>, "" ); |
| 40 | #endif |
| 41 | } |
| 42 | |
| 43 | struct D; |
| 44 | |
| 45 | #if TEST_STD_VER >= 11 |
| 46 | struct C |
| 47 | { |
| 48 | template <class U> |
| 49 | D operator,(U&&); |
| 50 | }; |
| 51 | |
| 52 | struct E |
| 53 | { |
| 54 | C operator=(int); |
| 55 | }; |
| 56 | #endif |
| 57 | |
| 58 | template <typename T> |
| 59 | struct X { T t; }; |
| 60 | |
| 61 | int main(int, char**) |
| 62 | { |
| 63 | test_is_assignable<int&, int&> (); |
| 64 | test_is_assignable<int&, int> (); |
| 65 | test_is_assignable<int&, double> (); |
| 66 | test_is_assignable<B, A> (); |
| 67 | test_is_assignable<void*&, void*> (); |
| 68 | |
| 69 | #if TEST_STD_VER >= 11 |
| 70 | test_is_assignable<E, int> (); |
| 71 | |
| 72 | test_is_not_assignable<int, int&> (); |
| 73 | test_is_not_assignable<int, int> (); |
| 74 | #endif |
| 75 | test_is_not_assignable<A, B> (); |
| 76 | test_is_not_assignable<void, const void> (); |
| 77 | test_is_not_assignable<const void, const void> (); |
| 78 | test_is_not_assignable<int(), int> (); |
| 79 | |
| 80 | // pointer to incomplete template type |
| 81 | test_is_assignable<X<D>*&, X<D>*> (); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |