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
10 // <system_error>
11 
12 // class error_category
13 
14 // constexpr error_category() noexcept;
15 
16 #include <system_error>
17 #include <type_traits>
18 #include <string>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
23 class test1
24     : public std::error_category
25 {
26 public:
27     constexpr test1() = default;  // won't compile if error_category() is not constexpr
name() const28     virtual const char* name() const noexcept {return nullptr;}
message(int) const29     virtual std::string message(int) const {return std::string();}
30 };
31 
main(int,char **)32 int main(int, char**)
33 {
34     static_assert(std::is_nothrow_default_constructible<test1>::value,
35                                  "error_category() must exist and be noexcept");
36 
37   return 0;
38 }
39