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//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// <system_error>
// class error_category
// constexpr error_category() noexcept;
#include <system_error>
#include <type_traits>
#include <string>
#include <cassert>
#if _LIBCPP_STD_VER > 11
class test1
: public std::error_category
{
public:
constexpr test1() = default; // won't compile if error_category() is not constexpr
virtual const char* name() const noexcept {return nullptr;}
virtual std::string message(int ev) const {return std::string();}
};
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
static_assert(std::is_nothrow_default_constructible<test1>::value,
"error_category() must exist and be noexcept");
#endif // _LIBCPP_STD_VER > 11
}
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