103 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// type_traits10 11// is_reference12 13#include <type_traits>14#include <cstddef> // for std::nullptr_t15#include "test_macros.h"16 17template <class T>18void test_is_reference()19{20 static_assert( std::is_reference<T>::value, "");21 static_assert( std::is_reference<const T>::value, "");22 static_assert( std::is_reference<volatile T>::value, "");23 static_assert( std::is_reference<const volatile T>::value, "");24#if TEST_STD_VER > 1425 static_assert( std::is_reference_v<T>, "");26 static_assert( std::is_reference_v<const T>, "");27 static_assert( std::is_reference_v<volatile T>, "");28 static_assert( std::is_reference_v<const volatile T>, "");29#endif30}31 32template <class T>33void test_is_not_reference()34{35 static_assert(!std::is_reference<T>::value, "");36 static_assert(!std::is_reference<const T>::value, "");37 static_assert(!std::is_reference<volatile T>::value, "");38 static_assert(!std::is_reference<const volatile T>::value, "");39#if TEST_STD_VER > 1440 static_assert(!std::is_reference_v<T>, "");41 static_assert(!std::is_reference_v<const T>, "");42 static_assert(!std::is_reference_v<volatile T>, "");43 static_assert(!std::is_reference_v<const volatile T>, "");44#endif45}46 47class incomplete_type;48 49class Empty50{51};52 53class NotEmpty54{55 virtual ~NotEmpty();56};57 58union Union {};59 60struct bit_zero61{62 int : 0;63};64 65class Abstract66{67 virtual ~Abstract() = 0;68};69 70enum Enum {zero, one};71 72typedef void (*FunctionPtr)();73 74 75int main(int, char**)76{77 test_is_reference<int&>();78 test_is_reference<int&&>();79 test_is_not_reference<std::nullptr_t>();80 test_is_not_reference<void>();81 test_is_not_reference<int>();82 test_is_not_reference<double>();83 test_is_not_reference<char[3]>();84 test_is_not_reference<char[]>();85 test_is_not_reference<void *>();86 test_is_not_reference<FunctionPtr>();87 test_is_not_reference<Union>();88 test_is_not_reference<incomplete_type>();89 test_is_not_reference<Empty>();90 test_is_not_reference<bit_zero>();91 test_is_not_reference<int*>();92 test_is_not_reference<const int*>();93 test_is_not_reference<Enum>();94 test_is_not_reference<NotEmpty>();95 test_is_not_reference<Abstract>();96 test_is_not_reference<int(int)>();97 test_is_not_reference<int Empty::*>();98 test_is_not_reference<void (Empty::*)(int)>();99 100 101 return 0;102}103