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1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: c++03
11 
12 // <system_error>
13 
14 // template <> struct is_error_code_enum<> : public false_type {};
15 
16 #include <system_error>
17 #include <string>
18 #include "test_macros.h"
19 
20 template <bool Expected, class T>
21 void
test()22 test()
23 {
24     static_assert((std::is_error_code_enum<T>::value == Expected), "");
25 #if TEST_STD_VER > 14
26     static_assert((std::is_error_code_enum_v<T>      == Expected), "");
27 #endif
28 }
29 
30 class A {
31     A();
operator std::error_code() const32     operator std::error_code () const { return std::error_code(); }
33 };
34 
35 // Specialize the template for my class
36 namespace std
37 {
38   template <>
39   struct is_error_code_enum<A> : public std::true_type {};
40 }
41 
42 
main()43 int main()
44 {
45     test<false, void>();
46     test<false, int>();
47     test<false, std::nullptr_t>();
48     test<false, std::string>();
49 
50     test<true, A>();
51 }
52