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++98, c++03, c++11 11 // <system_error> 12 13 // class error_category 14 15 // constexpr error_category() noexcept; 16 17 #include <system_error> 18 #include <type_traits> 19 #include <string> 20 #include <cassert> 21 22 class test1 23 : public std::error_category 24 { 25 public: 26 constexpr test1() = default; // won't compile if error_category() is not constexpr 27 virtual const char* name() const noexcept {return nullptr;} 28 virtual std::string message(int) const {return std::string();} 29 }; 30 31 int main() 32 { 33 static_assert(std::is_nothrow_default_constructible<test1>::value, 34 "error_category() must exist and be noexcept"); 35 } 36
