1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H 11 #define _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H 12 13 #include <__compare/ordering.h> 14 #include <__config> 15 #include <string> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 class _LIBCPP_EXPORTED_FROM_ABI error_condition; 24 class _LIBCPP_EXPORTED_FROM_ABI error_code; 25 26 class _LIBCPP_HIDDEN __do_message; 27 28 class _LIBCPP_EXPORTED_FROM_ABI error_category { 29 public: 30 virtual ~error_category() _NOEXCEPT; 31 32 #if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS) 33 error_category() noexcept; 34 #else 35 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 error_category() _NOEXCEPT = default; 36 #endif 37 error_category(const error_category&) = delete; 38 error_category& operator=(const error_category&) = delete; 39 40 virtual const char* name() const _NOEXCEPT = 0; 41 virtual error_condition default_error_condition(int __ev) const _NOEXCEPT; 42 virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT; 43 virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT; 44 virtual string message(int __ev) const = 0; 45 46 _LIBCPP_HIDE_FROM_ABI bool operator==(const error_category& __rhs) const _NOEXCEPT { return this == &__rhs; } 47 48 #if _LIBCPP_STD_VER >= 20 49 50 _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_category& __rhs) const noexcept { 51 return compare_three_way()(this, std::addressof(__rhs)); 52 } 53 54 #else // _LIBCPP_STD_VER >= 20 55 56 _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_category& __rhs) const _NOEXCEPT { return !(*this == __rhs); } 57 58 _LIBCPP_HIDE_FROM_ABI bool operator<(const error_category& __rhs) const _NOEXCEPT { return this < &__rhs; } 59 60 #endif // _LIBCPP_STD_VER >= 20 61 62 friend class _LIBCPP_HIDDEN __do_message; 63 }; 64 65 class _LIBCPP_HIDDEN __do_message : public error_category { 66 public: 67 string message(int __ev) const override; 68 }; 69 70 _LIBCPP_EXPORTED_FROM_ABI const error_category& generic_category() _NOEXCEPT; 71 _LIBCPP_EXPORTED_FROM_ABI const error_category& system_category() _NOEXCEPT; 72 73 _LIBCPP_END_NAMESPACE_STD 74 75 #endif // _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H 76