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 // <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 #if _LIBCPP_STD_VER > 11 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 28 virtual const char* name() const noexcept {return nullptr;} 29 virtual std::string message(int ev) const {return std::string();} 30 }; 31 32 #endif // _LIBCPP_STD_VER > 11 33 34 int main() 35 { 36 #if _LIBCPP_STD_VER > 11 37 static_assert(std::is_nothrow_default_constructible<test1>::value, 38 "error_category() must exist and be noexcept"); 39 #endif // _LIBCPP_STD_VER > 11 40 } 41
