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_function 13 14 #include <type_traits> 15 #include <cstddef> // for std::nullptr_t 16 17 #include "test_macros.h" 18 19 template <class T> 20 void test_is_function() 21 { 22 static_assert( std::is_function<T>::value, ""); 23 static_assert( std::is_function<const T>::value, ""); 24 static_assert( std::is_function<volatile T>::value, ""); 25 static_assert( std::is_function<const volatile T>::value, ""); 26 #if TEST_STD_VER > 14 27 static_assert( std::is_function_v<T>, ""); 28 static_assert( std::is_function_v<const T>, ""); 29 static_assert( std::is_function_v<volatile T>, ""); 30 static_assert( std::is_function_v<const volatile T>, ""); 31 #endif 32 } 33 34 template <class T> 35 void test_is_not_function() 36 { 37 static_assert(!std::is_function<T>::value, ""); 38 static_assert(!std::is_function<const T>::value, ""); 39 static_assert(!std::is_function<volatile T>::value, ""); 40 static_assert(!std::is_function<const volatile T>::value, ""); 41 #if TEST_STD_VER > 14 42 static_assert(!std::is_function_v<T>, ""); 43 static_assert(!std::is_function_v<const T>, ""); 44 static_assert(!std::is_function_v<volatile T>, ""); 45 static_assert(!std::is_function_v<const volatile T>, ""); 46 #endif 47 } 48 49 class Empty 50 { 51 }; 52 53 class NotEmpty 54 { 55 virtual ~NotEmpty(); 56 }; 57 58 union Union {}; 59 60 struct bit_zero 61 { 62 int : 0; 63 }; 64 65 class Abstract 66 { 67 virtual ~Abstract() = 0; 68 }; 69 70 enum Enum {zero, one}; 71 struct incomplete_type; 72 73 typedef void (*FunctionPtr)(); 74 75 int main() 76 { 77 test_is_function<void(void)>(); 78 test_is_function<int(int)>(); 79 test_is_function<int(int, double)>(); 80 test_is_function<int(Abstract *)>(); 81 test_is_function<void(...)>(); 82 83 test_is_not_function<std::nullptr_t>(); 84 test_is_not_function<void>(); 85 test_is_not_function<int>(); 86 test_is_not_function<int&>(); 87 test_is_not_function<int&&>(); 88 test_is_not_function<int*>(); 89 test_is_not_function<double>(); 90 test_is_not_function<char[3]>(); 91 test_is_not_function<char[]>(); 92 test_is_not_function<Union>(); 93 test_is_not_function<Enum>(); 94 test_is_not_function<FunctionPtr>(); // function pointer is not a function 95 test_is_not_function<Empty>(); 96 test_is_not_function<bit_zero>(); 97 test_is_not_function<NotEmpty>(); 98 test_is_not_function<Abstract>(); 99 test_is_not_function<Abstract*>(); 100 test_is_not_function<incomplete_type>(); 101 102 #if TEST_STD_VER >= 11 103 test_is_function<void() noexcept>(); 104 test_is_function<void() const && noexcept>(); 105 #endif 106 } 107
