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 | |