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_default_constructible 13 14 #include <type_traits> 15 #include "test_macros.h" 16 17 template <class T> 18 void test_is_default_constructible() 19 { 20 static_assert( std::is_default_constructible<T>::value, ""); 21 static_assert( std::is_default_constructible<const T>::value, ""); 22 static_assert( std::is_default_constructible<volatile T>::value, ""); 23 static_assert( std::is_default_constructible<const volatile T>::value, ""); 24 #if TEST_STD_VER > 14 25 static_assert( std::is_default_constructible_v<T>, ""); 26 static_assert( std::is_default_constructible_v<const T>, ""); 27 static_assert( std::is_default_constructible_v<volatile T>, ""); 28 static_assert( std::is_default_constructible_v<const volatile T>, ""); 29 #endif 30 } 31 32 template <class T> 33 void test_is_not_default_constructible() 34 { 35 static_assert(!std::is_default_constructible<T>::value, ""); 36 static_assert(!std::is_default_constructible<const T>::value, ""); 37 static_assert(!std::is_default_constructible<volatile T>::value, ""); 38 static_assert(!std::is_default_constructible<const volatile T>::value, ""); 39 #if TEST_STD_VER > 14 40 static_assert(!std::is_default_constructible_v<T>, ""); 41 static_assert(!std::is_default_constructible_v<const T>, ""); 42 static_assert(!std::is_default_constructible_v<volatile T>, ""); 43 static_assert(!std::is_default_constructible_v<const volatile T>, ""); 44 #endif 45 } 46 47 class Empty 48 { 49 }; 50 51 class NoDefaultConstructor 52 { 53 NoDefaultConstructor(int) {} 54 }; 55 56 class NotEmpty 57 { 58 public: 59 virtual ~NotEmpty(); 60 }; 61 62 union Union {}; 63 64 struct bit_zero 65 { 66 int : 0; 67 }; 68 69 class Abstract 70 { 71 public: 72 virtual ~Abstract() = 0; 73 }; 74 75 struct A 76 { 77 A(); 78 }; 79 80 class B 81 { 82 B(); 83 }; 84 85 int main() 86 { 87 test_is_default_constructible<A>(); 88 test_is_default_constructible<Union>(); 89 test_is_default_constructible<Empty>(); 90 test_is_default_constructible<int>(); 91 test_is_default_constructible<double>(); 92 test_is_default_constructible<int*>(); 93 test_is_default_constructible<const int*>(); 94 test_is_default_constructible<char[3]>(); 95 test_is_default_constructible<char[5][3]>(); 96 97 test_is_default_constructible<NotEmpty>(); 98 test_is_default_constructible<bit_zero>(); 99 100 test_is_not_default_constructible<void>(); 101 test_is_not_default_constructible<int&>(); 102 test_is_not_default_constructible<char[]>(); 103 test_is_not_default_constructible<char[][3]>(); 104 105 test_is_not_default_constructible<Abstract>(); 106 test_is_not_default_constructible<NoDefaultConstructor>(); 107 #if TEST_STD_VER >= 11 108 test_is_not_default_constructible<B>(); 109 test_is_not_default_constructible<int&&>(); 110 111 // TODO: Remove this workaround once Clang <= 3.7 are no longer used regularly. 112 // In those compiler versions the __is_constructible builtin gives the wrong 113 // results for abominable function types. 114 #if (defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER < 703) \ 115 || (defined(TEST_CLANG_VER) && TEST_CLANG_VER < 308) 116 #define WORKAROUND_CLANG_BUG 117 #endif 118 #if !defined(WORKAROUND_CLANG_BUG) 119 test_is_not_default_constructible<void()>(); 120 test_is_not_default_constructible<void() const> (); 121 test_is_not_default_constructible<void() volatile> (); 122 test_is_not_default_constructible<void() &> (); 123 test_is_not_default_constructible<void() &&> (); 124 #endif 125 #endif 126 } 127
