| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| // UNSUPPORTED: clang-3, clang-4, clang-5, apple-clang, gcc-4, gcc-5, gcc-6 |
| |
| // type_traits |
| |
| // has_unique_object_representations |
| |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| |
| template <class T> |
| void test_has_unique_object_representations() |
| { |
| static_assert( std::has_unique_object_representations<T>::value, ""); |
| static_assert( std::has_unique_object_representations<const T>::value, ""); |
| static_assert( std::has_unique_object_representations<volatile T>::value, ""); |
| static_assert( std::has_unique_object_representations<const volatile T>::value, ""); |
| |
| static_assert( std::has_unique_object_representations_v<T>, ""); |
| static_assert( std::has_unique_object_representations_v<const T>, ""); |
| static_assert( std::has_unique_object_representations_v<volatile T>, ""); |
| static_assert( std::has_unique_object_representations_v<const volatile T>, ""); |
| } |
| |
| template <class T> |
| void test_has_not_has_unique_object_representations() |
| { |
| static_assert(!std::has_unique_object_representations<T>::value, ""); |
| static_assert(!std::has_unique_object_representations<const T>::value, ""); |
| static_assert(!std::has_unique_object_representations<volatile T>::value, ""); |
| static_assert(!std::has_unique_object_representations<const volatile T>::value, ""); |
| |
| static_assert(!std::has_unique_object_representations_v<T>, ""); |
| static_assert(!std::has_unique_object_representations_v<const T>, ""); |
| static_assert(!std::has_unique_object_representations_v<volatile T>, ""); |
| static_assert(!std::has_unique_object_representations_v<const volatile T>, ""); |
| } |
| |
| class Empty |
| { |
| }; |
| |
| class NotEmpty |
| { |
| virtual ~NotEmpty(); |
| }; |
| |
| union EmptyUnion {}; |
| struct NonEmptyUnion {int x; unsigned y;}; |
| |
| struct bit_zero |
| { |
| int : 0; |
| }; |
| |
| class Abstract |
| { |
| virtual ~Abstract() = 0; |
| }; |
| |
| struct A |
| { |
| ~A(); |
| unsigned foo; |
| }; |
| |
| struct B |
| { |
| char bar; |
| int foo; |
| }; |
| |
| |
| int main(int, char**) |
| { |
| test_has_not_has_unique_object_representations<void>(); |
| test_has_not_has_unique_object_representations<Empty>(); |
| test_has_not_has_unique_object_representations<EmptyUnion>(); |
| test_has_not_has_unique_object_representations<NotEmpty>(); |
| test_has_not_has_unique_object_representations<bit_zero>(); |
| test_has_not_has_unique_object_representations<Abstract>(); |
| test_has_not_has_unique_object_representations<B>(); |
| |
| // I would expect all three of these to have unique representations. |
| // I would also expect that there are systems where they do not. |
| // test_has_not_has_unique_object_representations<int&>(); |
| // test_has_not_has_unique_object_representations<int *>(); |
| // test_has_not_has_unique_object_representations<double>(); |
| |
| |
| test_has_unique_object_representations<unsigned>(); |
| test_has_unique_object_representations<NonEmptyUnion>(); |
| test_has_unique_object_representations<char[3]>(); |
| test_has_unique_object_representations<char[]>(); |
| |
| |
| return 0; |
| } |