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
22template <bool Expected, class T>
23void
24test()
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
33class A {
34 A();
35 operator std::error_condition () const { return std::error_condition(); }
36};
37
38// Specialize the template for my class
39template <>
40struct std::is_error_condition_enum<A> : public std::true_type {};
41
42int 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

source code of libcxx/test/std/diagnostics/syserr/is_error_condition_enum.pass.cpp