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 // union
13
14 #include <type_traits>
15 #include "test_macros.h"
16
17 template <class T>
test_union_imp()18 void test_union_imp()
19 {
20 static_assert(!std::is_void<T>::value, "");
21 #if TEST_STD_VER > 11
22 static_assert(!std::is_null_pointer<T>::value, "");
23 #endif
24 static_assert(!std::is_integral<T>::value, "");
25 static_assert(!std::is_floating_point<T>::value, "");
26 static_assert(!std::is_array<T>::value, "");
27 static_assert(!std::is_pointer<T>::value, "");
28 static_assert(!std::is_lvalue_reference<T>::value, "");
29 static_assert(!std::is_rvalue_reference<T>::value, "");
30 static_assert(!std::is_member_object_pointer<T>::value, "");
31 static_assert(!std::is_member_function_pointer<T>::value, "");
32 static_assert(!std::is_enum<T>::value, "");
33 static_assert( std::is_union<T>::value, "");
34 static_assert(!std::is_class<T>::value, "");
35 static_assert(!std::is_function<T>::value, "");
36 }
37
38 template <class T>
test_union()39 void test_union()
40 {
41 test_union_imp<T>();
42 test_union_imp<const T>();
43 test_union_imp<volatile T>();
44 test_union_imp<const volatile T>();
45 }
46
47 union Union
48 {
49 int _;
50 double __;
51 };
52
53 struct incomplete_type;
54
main()55 int main()
56 {
57 test_union<Union>();
58
59 // LWG#2582
60 static_assert(!std::is_union<incomplete_type>::value, "");
61 }
62