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_CODE_H 11 #define _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H 12 13 #include <__compare/ordering.h> 14 #include <__config> 15 #include <__functional/hash.h> 16 #include <__functional/unary_function.h> 17 #include <__system_error/errc.h> 18 #include <__system_error/error_category.h> 19 #include <__system_error/error_condition.h> 20 #include <string> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_BEGIN_NAMESPACE_STD 27 28 template <class _Tp> 29 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum : public false_type {}; 30 31 #if _LIBCPP_STD_VER >= 17 32 template <class _Tp> 33 inline constexpr bool is_error_code_enum_v = is_error_code_enum<_Tp>::value; 34 #endif 35 36 namespace __adl_only { 37 // Those cause ADL to trigger but they are not viable candidates, 38 // so they are never actually selected. 39 void make_error_code() = delete; 40 } // namespace __adl_only 41 42 class _LIBCPP_EXPORTED_FROM_ABI error_code { 43 int __val_; 44 const error_category* __cat_; 45 46 public: 47 _LIBCPP_HIDE_FROM_ABI error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {} 48 49 _LIBCPP_HIDE_FROM_ABI error_code(int __val, const error_category& __cat) _NOEXCEPT : __val_(__val), __cat_(&__cat) {} 50 51 template <class _Ep, __enable_if_t<is_error_code_enum<_Ep>::value, int> = 0> 52 _LIBCPP_HIDE_FROM_ABI error_code(_Ep __e) _NOEXCEPT { 53 using __adl_only::make_error_code; 54 *this = make_error_code(__e); 55 } 56 57 _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT { 58 __val_ = __val; 59 __cat_ = &__cat; 60 } 61 62 template <class _Ep, __enable_if_t<is_error_code_enum<_Ep>::value, int> = 0> 63 _LIBCPP_HIDE_FROM_ABI error_code& operator=(_Ep __e) _NOEXCEPT { 64 using __adl_only::make_error_code; 65 *this = make_error_code(__e); 66 return *this; 67 } 68 69 _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT { 70 __val_ = 0; 71 __cat_ = &system_category(); 72 } 73 74 _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; } 75 76 _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; } 77 78 _LIBCPP_HIDE_FROM_ABI error_condition default_error_condition() const _NOEXCEPT { 79 return __cat_->default_error_condition(__val_); 80 } 81 82 string message() const; 83 84 _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; } 85 }; 86 87 inline _LIBCPP_HIDE_FROM_ABI error_code make_error_code(errc __e) _NOEXCEPT { 88 return error_code(static_cast<int>(__e), generic_category()); 89 } 90 91 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_code& __y) _NOEXCEPT { 92 return __x.category() == __y.category() && __x.value() == __y.value(); 93 } 94 95 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT { 96 return __x.category().equivalent(__x.value(), __y) || __y.category().equivalent(__x, __y.value()); 97 } 98 99 #if _LIBCPP_STD_VER <= 17 100 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT { 101 return __y == __x; 102 } 103 #endif 104 105 #if _LIBCPP_STD_VER <= 17 106 107 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT { 108 return !(__x == __y); 109 } 110 111 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT { 112 return !(__x == __y); 113 } 114 115 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT { 116 return !(__x == __y); 117 } 118 119 inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_code& __x, const error_code& __y) _NOEXCEPT { 120 return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value()); 121 } 122 123 #else // _LIBCPP_STD_VER <= 17 124 125 inline _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_code& __x, const error_code& __y) noexcept { 126 if (auto __c = __x.category() <=> __y.category(); __c != 0) 127 return __c; 128 return __x.value() <=> __y.value(); 129 } 130 131 #endif // _LIBCPP_STD_VER <= 17 132 133 template <> 134 struct _LIBCPP_TEMPLATE_VIS hash<error_code> : public __unary_function<error_code, size_t> { 135 _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_code& __ec) const _NOEXCEPT { 136 return static_cast<size_t>(__ec.value()); 137 } 138 }; 139 140 _LIBCPP_END_NAMESPACE_STD 141 142 #endif // _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H 143