| 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-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // UNSUPPORTED: c++03, c++11, c++14 |
| 10 | |
| 11 | // <system_error> |
| 12 | |
| 13 | // template <class T> constexpr bool is_error_condition_enum_v; |
| 14 | |
| 15 | #include <cstddef> |
| 16 | #include <string> |
| 17 | #include <system_error> |
| 18 | #include <type_traits> |
| 19 | |
| 20 | #include "test_macros.h" |
| 21 | |
| 22 | template <bool Expected, class T> |
| 23 | void |
| 24 | test() |
| 25 | { |
| 26 | static_assert((std::is_error_condition_enum<T>::value == Expected), "" ); |
| 27 | #if TEST_STD_VER > 14 |
| 28 | static_assert((std::is_error_condition_enum_v<T> == Expected), "" ); |
| 29 | ASSERT_SAME_TYPE(decltype(std::is_error_condition_enum_v<T>), const bool); |
| 30 | #endif |
| 31 | } |
| 32 | |
| 33 | class A { |
| 34 | A(); |
| 35 | operator std::error_condition () const { return std::error_condition(); } |
| 36 | }; |
| 37 | |
| 38 | // Specialize the template for my class |
| 39 | template <> |
| 40 | struct std::is_error_condition_enum<A> : public std::true_type {}; |
| 41 | |
| 42 | int main(int, char**) |
| 43 | { |
| 44 | test<false, void>(); |
| 45 | test<false, int>(); |
| 46 | test<false, std::nullptr_t>(); |
| 47 | test<false, std::string>(); |
| 48 | |
| 49 | test<true, A>(); |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |