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 // type_traits
11
12 // is_assignable
13
14 #include <type_traits>
15 #include "test_macros.h"
16
17 struct A
18 {
19 };
20
21 struct B
22 {
23 void operator=(A);
24 };
25
26 template <class T, class U>
test_is_assignable()27 void test_is_assignable()
28 {
29 static_assert(( std::is_assignable<T, U>::value), "");
30 #if TEST_STD_VER > 14
31 static_assert( std::is_assignable_v<T, U>, "");
32 #endif
33 }
34
35 template <class T, class U>
test_is_not_assignable()36 void test_is_not_assignable()
37 {
38 static_assert((!std::is_assignable<T, U>::value), "");
39 #if TEST_STD_VER > 14
40 static_assert( !std::is_assignable_v<T, U>, "");
41 #endif
42 }
43
44 struct D;
45
46 #if TEST_STD_VER >= 11
47 struct C
48 {
49 template <class U>
50 D operator,(U&&);
51 };
52
53 struct E
54 {
55 C operator=(int);
56 };
57 #endif
58
59 template <typename T>
60 struct X { T t; };
61
main()62 int main()
63 {
64 test_is_assignable<int&, int&> ();
65 test_is_assignable<int&, int> ();
66 test_is_assignable<int&, double> ();
67 test_is_assignable<B, A> ();
68 test_is_assignable<void*&, void*> ();
69
70 #if TEST_STD_VER >= 11
71 test_is_assignable<E, int> ();
72
73 test_is_not_assignable<int, int&> ();
74 test_is_not_assignable<int, int> ();
75 #endif
76 test_is_not_assignable<A, B> ();
77 test_is_not_assignable<void, const void> ();
78 test_is_not_assignable<const void, const void> ();
79 test_is_not_assignable<int(), int> ();
80
81 // pointer to incomplete template type
82 test_is_assignable<X<D>*&, X<D>*> ();
83 }
84