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 // void_t
13
14 // UNSUPPORTED: c++98, c++03, c++11, c++14
15
16 // XFAIL: gcc-5.1, gcc-5.2
17
18 #include <type_traits>
19
20 template <class T>
test1()21 void test1()
22 {
23 static_assert( std::is_same<void, std::void_t<T>>::value, "");
24 static_assert( std::is_same<void, std::void_t<const T>>::value, "");
25 static_assert( std::is_same<void, std::void_t<volatile T>>::value, "");
26 static_assert( std::is_same<void, std::void_t<const volatile T>>::value, "");
27 }
28
29 template <class T, class U>
test2()30 void test2()
31 {
32 static_assert( std::is_same<void, std::void_t<T, U>>::value, "");
33 static_assert( std::is_same<void, std::void_t<const T, U>>::value, "");
34 static_assert( std::is_same<void, std::void_t<volatile T, U>>::value, "");
35 static_assert( std::is_same<void, std::void_t<const volatile T, U>>::value, "");
36
37 static_assert( std::is_same<void, std::void_t<T, const U>>::value, "");
38 static_assert( std::is_same<void, std::void_t<const T, const U>>::value, "");
39 static_assert( std::is_same<void, std::void_t<volatile T, const U>>::value, "");
40 static_assert( std::is_same<void, std::void_t<const volatile T, const U>>::value, "");
41 }
42
43 class Class
44 {
45 public:
46 ~Class();
47 };
48
main()49 int main()
50 {
51 static_assert( std::is_same<void, std::void_t<>>::value, "");
52
53 test1<void>();
54 test1<int>();
55 test1<double>();
56 test1<int&>();
57 test1<Class>();
58 test1<Class[]>();
59 test1<Class[5]>();
60
61 test2<void, int>();
62 test2<double, int>();
63 test2<int&, int>();
64 test2<Class&, bool>();
65 test2<void *, int&>();
66
67 static_assert( std::is_same<void, std::void_t<int, double const &, Class, volatile int[], void>>::value, "");
68 }
69