| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H |
| #define _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H |
| |
| #include <__compare/ordering.h> |
| #include <__config> |
| #include <__functional/hash.h> |
| #include <__functional/unary_function.h> |
| #include <__system_error/errc.h> |
| #include <__system_error/error_category.h> |
| #include <cstddef> |
| #include <string> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Tp> |
| struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum : public false_type {}; |
| |
| #if _LIBCPP_STD_VER >= 17 |
| template <class _Tp> |
| inline constexpr bool is_error_condition_enum_v = is_error_condition_enum<_Tp>::value; |
| #endif |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc> : true_type {}; |
| |
| #ifdef _LIBCPP_CXX03_LANG |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx> : true_type {}; |
| #endif |
| |
| namespace __adl_only { |
| // Those cause ADL to trigger but they are not viable candidates, |
| // so they are never actually selected. |
| void make_error_condition() = delete; |
| } // namespace __adl_only |
| |
| class _LIBCPP_EXPORTED_FROM_ABI error_condition { |
| int __val_; |
| const error_category* __cat_; |
| |
| public: |
| _LIBCPP_HIDE_FROM_ABI error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {} |
| |
| _LIBCPP_HIDE_FROM_ABI error_condition(int __val, const error_category& __cat) _NOEXCEPT |
| : __val_(__val), |
| __cat_(&__cat) {} |
| |
| template <class _Ep, __enable_if_t<is_error_condition_enum<_Ep>::value, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI error_condition(_Ep __e) _NOEXCEPT { |
| using __adl_only::make_error_condition; |
| *this = make_error_condition(__e); |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT { |
| __val_ = __val; |
| __cat_ = &__cat; |
| } |
| |
| template <class _Ep, __enable_if_t<is_error_condition_enum<_Ep>::value, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI error_condition& operator=(_Ep __e) _NOEXCEPT { |
| using __adl_only::make_error_condition; |
| *this = make_error_condition(__e); |
| return *this; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT { |
| __val_ = 0; |
| __cat_ = &generic_category(); |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; } |
| |
| _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; } |
| string message() const; |
| |
| _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; } |
| }; |
| |
| inline _LIBCPP_HIDE_FROM_ABI error_condition make_error_condition(errc __e) _NOEXCEPT { |
| return error_condition(static_cast<int>(__e), generic_category()); |
| } |
| |
| inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT { |
| return __x.category() == __y.category() && __x.value() == __y.value(); |
| } |
| |
| #if _LIBCPP_STD_VER <= 17 |
| |
| inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT { |
| return !(__x == __y); |
| } |
| |
| inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT { |
| return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value()); |
| } |
| |
| #else // _LIBCPP_STD_VER <= 17 |
| |
| inline _LIBCPP_HIDE_FROM_ABI strong_ordering |
| operator<=>(const error_condition& __x, const error_condition& __y) noexcept { |
| if (auto __c = __x.category() <=> __y.category(); __c != 0) |
| return __c; |
| return __x.value() <=> __y.value(); |
| } |
| |
| #endif // _LIBCPP_STD_VER <= 17 |
| |
| template <> |
| struct _LIBCPP_TEMPLATE_VIS hash<error_condition> : public __unary_function<error_condition, size_t> { |
| _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_condition& __ec) const _NOEXCEPT { |
| return static_cast<size_t>(__ec.value()); |
| } |
| }; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H |