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_reference 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_reference() 20 { 21 static_assert( std::is_reference<T>::value, ""); 22 static_assert( std::is_reference<const T>::value, ""); 23 static_assert( std::is_reference<volatile T>::value, ""); 24 static_assert( std::is_reference<const volatile T>::value, ""); 25 #if TEST_STD_VER > 14 26 static_assert( std::is_reference_v<T>, ""); 27 static_assert( std::is_reference_v<const T>, ""); 28 static_assert( std::is_reference_v<volatile T>, ""); 29 static_assert( std::is_reference_v<const volatile T>, ""); 30 #endif 31 } 32 33 template <class T> 34 void test_is_not_reference() 35 { 36 static_assert(!std::is_reference<T>::value, ""); 37 static_assert(!std::is_reference<const T>::value, ""); 38 static_assert(!std::is_reference<volatile T>::value, ""); 39 static_assert(!std::is_reference<const volatile T>::value, ""); 40 #if TEST_STD_VER > 14 41 static_assert(!std::is_reference_v<T>, ""); 42 static_assert(!std::is_reference_v<const T>, ""); 43 static_assert(!std::is_reference_v<volatile T>, ""); 44 static_assert(!std::is_reference_v<const volatile T>, ""); 45 #endif 46 } 47 48 class incomplete_type; 49 50 class Empty 51 { 52 }; 53 54 class NotEmpty 55 { 56 virtual ~NotEmpty(); 57 }; 58 59 union Union {}; 60 61 struct bit_zero 62 { 63 int : 0; 64 }; 65 66 class Abstract 67 { 68 virtual ~Abstract() = 0; 69 }; 70 71 enum Enum {zero, one}; 72 73 typedef void (*FunctionPtr)(); 74 75 76 int main() 77 { 78 test_is_reference<int&>(); 79 #if TEST_STD_VER >= 11 80 test_is_reference<int&&>(); 81 #endif 82 83 test_is_not_reference<std::nullptr_t>(); 84 test_is_not_reference<void>(); 85 test_is_not_reference<int>(); 86 test_is_not_reference<double>(); 87 test_is_not_reference<char[3]>(); 88 test_is_not_reference<char[]>(); 89 test_is_not_reference<void *>(); 90 test_is_not_reference<FunctionPtr>(); 91 test_is_not_reference<Union>(); 92 test_is_not_reference<incomplete_type>(); 93 test_is_not_reference<Empty>(); 94 test_is_not_reference<bit_zero>(); 95 test_is_not_reference<int*>(); 96 test_is_not_reference<const int*>(); 97 test_is_not_reference<Enum>(); 98 test_is_not_reference<NotEmpty>(); 99 test_is_not_reference<Abstract>(); 100 test_is_not_reference<int(int)>(); 101 test_is_not_reference<int Empty::*>(); 102 test_is_not_reference<void (Empty::*)(int)>(); 103 104 } 105
