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