1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: c++03
// <system_error>
// template <> struct is_error_code_enum<> : public false_type {};
#include <system_error>
#include <string>
#include "test_macros.h"
template <bool Expected, class T>
void
test()
{
static_assert((std::is_error_code_enum<T>::value == Expected), "");
#if TEST_STD_VER > 14
static_assert((std::is_error_code_enum_v<T> == Expected), "");
#endif
}
class A {
A();
operator std::error_code () const { return std::error_code(); }
};
// Specialize the template for my class
namespace std
{
template <>
struct is_error_code_enum<A> : public std::true_type {};
}
int main()
{
test<false, void>();
test<false, int>();
test<false, std::nullptr_t>();
test<false, std::string>();
test<true, A>();
}
|
