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_union 13 14 #include <type_traits> 15 #include <cstddef> // for std::nullptr_t 16 #include "test_macros.h" 17 18 template <class T> 19 void test_is_union() 20 { 21 static_assert( std::is_union<T>::value, ""); 22 static_assert( std::is_union<const T>::value, ""); 23 static_assert( std::is_union<volatile T>::value, ""); 24 static_assert( std::is_union<const volatile T>::value, ""); 25 #if TEST_STD_VER > 14 26 static_assert( std::is_union_v<T>, ""); 27 static_assert( std::is_union_v<const T>, ""); 28 static_assert( std::is_union_v<volatile T>, ""); 29 static_assert( std::is_union_v<const volatile T>, ""); 30 #endif 31 } 32 33 template <class T> 34 void test_is_not_union() 35 { 36 static_assert(!std::is_union<T>::value, ""); 37 static_assert(!std::is_union<const T>::value, ""); 38 static_assert(!std::is_union<volatile T>::value, ""); 39 static_assert(!std::is_union<const volatile T>::value, ""); 40 #if TEST_STD_VER > 14 41 static_assert(!std::is_union_v<T>, ""); 42 static_assert(!std::is_union_v<const T>, ""); 43 static_assert(!std::is_union_v<volatile T>, ""); 44 static_assert(!std::is_union_v<const volatile T>, ""); 45 #endif 46 } 47 48 class Empty 49 { 50 }; 51 52 class NotEmpty 53 { 54 virtual ~NotEmpty(); 55 }; 56 57 union Union {}; 58 59 struct bit_zero 60 { 61 int : 0; 62 }; 63 64 class Abstract 65 { 66 virtual ~Abstract() = 0; 67 }; 68 69 enum Enum {zero, one}; 70 struct incomplete_type; 71 72 typedef void (*FunctionPtr)(); 73 74 int main() 75 { 76 test_is_union<Union>(); 77 78 test_is_not_union<std::nullptr_t>(); 79 test_is_not_union<void>(); 80 test_is_not_union<int>(); 81 test_is_not_union<int&>(); 82 test_is_not_union<int&&>(); 83 test_is_not_union<int*>(); 84 test_is_not_union<double>(); 85 test_is_not_union<const int*>(); 86 test_is_not_union<char[3]>(); 87 test_is_not_union<char[]>(); 88 test_is_not_union<Enum>(); 89 test_is_not_union<FunctionPtr>(); 90 test_is_not_union<Empty>(); 91 test_is_not_union<bit_zero>(); 92 test_is_not_union<NotEmpty>(); 93 test_is_not_union<Abstract>(); 94 test_is_not_union<incomplete_type>(); 95 } 96
