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 | |