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// -*- C++ -*-
//===---------------------------- system_error ----------------------------===//
//
// 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
#define _LIBCPP_SYSTEM_ERROR
/*
system_error synopsis
namespace std
{
class error_category
{
public:
virtual ~error_category() noexcept;
constexpr error_category();
error_category(const error_category&) = delete;
error_category& operator=(const error_category&) = delete;
virtual const char* name() const noexcept = 0;
virtual error_condition default_error_condition(int ev) const noexcept;
virtual bool equivalent(int code, const error_condition& condition) const noexcept;
virtual bool equivalent(const error_code& code, int condition) const noexcept;
virtual string message(int ev) const = 0;
bool operator==(const error_category& rhs) const noexcept;
bool operator!=(const error_category& rhs) const noexcept;
bool operator<(const error_category& rhs) const noexcept;
};
const error_category& generic_category() noexcept;
const error_category& system_category() noexcept;
template <class T> struct is_error_code_enum
: public false_type {};
template <class T> struct is_error_condition_enum
: public false_type {};
template <class _Tp>
inline constexpr size_t is_error_condition_enum_v = is_error_condition_enum<_Tp>::value; // C++17
template <class _Tp>
inline constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value; // C++17
class error_code
{
public:
// constructors:
error_code() noexcept;
error_code(int val, const error_category& cat) noexcept;
template <class ErrorCodeEnum>
error_code(ErrorCodeEnum e) noexcept;
// modifiers:
void assign(int val, const error_category& cat) noexcept;
template <class ErrorCodeEnum>
error_code& operator=(ErrorCodeEnum e) noexcept;
void clear() noexcept;
// observers:
int value() const noexcept;
const error_category& category() const noexcept;
error_condition default_error_condition() const noexcept;
string message() const;
explicit operator bool() const noexcept;
};
// non-member functions:
bool operator<(const error_code& lhs, const error_code& rhs) noexcept;
template <class charT, class traits>
basic_ostream<charT,traits>&
operator<<(basic_ostream<charT,traits>& os, const error_code& ec);
class error_condition
{
public:
// constructors:
error_condition() noexcept;
error_condition(int val, const error_category& cat) noexcept;
template <class ErrorConditionEnum>
error_condition(ErrorConditionEnum e) noexcept;
// modifiers:
void assign(int val, const error_category& cat) noexcept;
template <class ErrorConditionEnum>
error_condition& operator=(ErrorConditionEnum e) noexcept;
void clear() noexcept;
// observers:
int value() const noexcept;
const error_category& category() const noexcept;
string message() const noexcept;
explicit operator bool() const noexcept;
};
bool operator<(const error_condition& lhs, const error_condition& rhs) noexcept;
class system_error
: public runtime_error
{
public:
system_error(error_code ec, const string& what_arg);
system_error(error_code ec, const char* what_arg);
system_error(error_code ec);
system_error(int ev, const error_category& ecat, const string& what_arg);
system_error(int ev, const error_category& ecat, const char* what_arg);
system_error(int ev, const error_category& ecat);
const error_code& code() const noexcept;
const char* what() const noexcept;
};
template <> struct is_error_condition_enum<errc>
: true_type { }
error_code make_error_code(errc e) noexcept;
error_condition make_error_condition(errc e) noexcept;
// Comparison operators:
bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
bool operator!=(const error_code& lhs, const error_code& rhs) noexcept;
bool operator!=(const error_code& lhs, const error_condition& rhs) noexcept;
bool operator!=(const error_condition& lhs, const error_code& rhs) noexcept;
bool operator!=(const error_condition& lhs, const error_condition& rhs) noexcept;
template <> struct hash<std::error_code>;
template <> struct hash<std::error_condition>;
} // std
*/
#include <__config>
#include <__errc>
#include <__functional/unary_function.h>
#include <__functional_base>
#include <compare>
#include <stdexcept>
#include <string>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
// is_error_code_enum
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum
: public false_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value;
#endif
// is_error_condition_enum
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum
: public false_type {};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
inline constexpr size_t 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_HAS_NO_STRONG_ENUMS
template <>
struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx>
: true_type { };
#endif
class _LIBCPP_TYPE_VIS error_condition;
class _LIBCPP_TYPE_VIS error_code;
// class error_category
class _LIBCPP_HIDDEN __do_message;
class _LIBCPP_TYPE_VIS error_category
{
public:
virtual ~error_category() _NOEXCEPT;
#if defined(_LIBCPP_BUILDING_LIBRARY) && \
defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS)
error_category() _NOEXCEPT;
#else
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT _LIBCPP_DEFAULT
#endif
private:
error_category(const error_category&);// = delete;
error_category& operator=(const error_category&);// = delete;
public:
virtual const char* name() const _NOEXCEPT = 0;
virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
virtual string message(int __ev) const = 0;
_LIBCPP_INLINE_VISIBILITY
bool operator==(const error_category& __rhs) const _NOEXCEPT {return this == &__rhs;}
_LIBCPP_INLINE_VISIBILITY
bool operator!=(const error_category& __rhs) const _NOEXCEPT {return !(*this == __rhs);}
_LIBCPP_INLINE_VISIBILITY
bool operator< (const error_category& __rhs) const _NOEXCEPT {return this < &__rhs;}
friend class _LIBCPP_HIDDEN __do_message;
};
class _LIBCPP_HIDDEN __do_message
: public error_category
{
public:
virtual string message(int ev) const;
};
_LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
_LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;
class _LIBCPP_TYPE_VIS error_condition
{
int __val_;
const error_category* __cat_;
public:
_LIBCPP_INLINE_VISIBILITY
error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}
_LIBCPP_INLINE_VISIBILITY
error_condition(int __val, const error_category& __cat) _NOEXCEPT
: __val_(__val), __cat_(&__cat) {}
template <class _Ep>
_LIBCPP_INLINE_VISIBILITY
error_condition(_Ep __e,
typename enable_if<is_error_condition_enum<_Ep>::value>::type* = nullptr
) _NOEXCEPT
{*this = make_error_condition(__e);}
_LIBCPP_INLINE_VISIBILITY
void assign(int __val, const error_category& __cat) _NOEXCEPT
{
__val_ = __val;
__cat_ = &__cat;
}
template <class _Ep>
_LIBCPP_INLINE_VISIBILITY
typename enable_if
<
is_error_condition_enum<_Ep>::value,
error_condition&
>::type
operator=(_Ep __e) _NOEXCEPT
{*this = make_error_condition(__e); return *this;}
_LIBCPP_INLINE_VISIBILITY
void clear() _NOEXCEPT
{
__val_ = 0;
__cat_ = &generic_category();
}
_LIBCPP_INLINE_VISIBILITY
int value() const _NOEXCEPT {return __val_;}
_LIBCPP_INLINE_VISIBILITY
const error_category& category() const _NOEXCEPT {return *__cat_;}
string message() const;
_LIBCPP_INLINE_VISIBILITY
explicit operator bool() const _NOEXCEPT {return __val_ != 0;}
};
inline _LIBCPP_INLINE_VISIBILITY
error_condition
make_error_condition(errc __e) _NOEXCEPT
{
return error_condition(static_cast<int>(__e), generic_category());
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{
return __x.category() < __y.category()
|| (__x.category() == __y.category() && __x.value() < __y.value());
}
// error_code
class _LIBCPP_TYPE_VIS error_code
{
int __val_;
const error_category* __cat_;
public:
_LIBCPP_INLINE_VISIBILITY
error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
_LIBCPP_INLINE_VISIBILITY
error_code(int __val, const error_category& __cat) _NOEXCEPT
: __val_(__val), __cat_(&__cat) {}
template <class _Ep>
_LIBCPP_INLINE_VISIBILITY
error_code(_Ep __e,
typename enable_if<is_error_code_enum<_Ep>::value>::type* = nullptr
) _NOEXCEPT
{*this = make_error_code(__e);}
_LIBCPP_INLINE_VISIBILITY
void assign(int __val, const error_category& __cat) _NOEXCEPT
{
__val_ = __val;
__cat_ = &__cat;
}
template <class _Ep>
_LIBCPP_INLINE_VISIBILITY
typename enable_if
<
is_error_code_enum<_Ep>::value,
error_code&
>::type
operator=(_Ep __e) _NOEXCEPT
{*this = make_error_code(__e); return *this;}
_LIBCPP_INLINE_VISIBILITY
void clear() _NOEXCEPT
{
__val_ = 0;
__cat_ = &system_category();
}
_LIBCPP_INLINE_VISIBILITY
int value() const _NOEXCEPT {return __val_;}
_LIBCPP_INLINE_VISIBILITY
const error_category& category() const _NOEXCEPT {return *__cat_;}
_LIBCPP_INLINE_VISIBILITY
error_condition default_error_condition() const _NOEXCEPT
{return __cat_->default_error_condition(__val_);}
string message() const;
_LIBCPP_INLINE_VISIBILITY
explicit operator bool() const _NOEXCEPT {return __val_ != 0;}
};
inline _LIBCPP_INLINE_VISIBILITY
error_code
make_error_code(errc __e) _NOEXCEPT
{
return error_code(static_cast<int>(__e), generic_category());
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<(const error_code& __x, const error_code& __y) _NOEXCEPT
{
return __x.category() < __y.category()
|| (__x.category() == __y.category() && __x.value() < __y.value());
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_code& __x, const error_code& __y) _NOEXCEPT
{
return __x.category() == __y.category() && __x.value() == __y.value();
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT
{
return __x.category().equivalent(__x.value(), __y)
|| __y.category().equivalent(__x, __y.value());
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT
{
return __y == __x;
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{
return __x.category() == __y.category() && __x.value() == __y.value();
}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
{return !(__x == __y);}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT
{return !(__x == __y);}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT
{return !(__x == __y);}
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
{return !(__x == __y);}
template <>
struct _LIBCPP_TEMPLATE_VIS hash<error_code>
: public unary_function<error_code, size_t>
{
_LIBCPP_INLINE_VISIBILITY
size_t operator()(const error_code& __ec) const _NOEXCEPT
{
return static_cast<size_t>(__ec.value());
}
};
template <>
struct _LIBCPP_TEMPLATE_VIS hash<error_condition>
: public unary_function<error_condition, size_t>
{
_LIBCPP_INLINE_VISIBILITY
size_t operator()(const error_condition& __ec) const _NOEXCEPT
{
return static_cast<size_t>(__ec.value());
}
};
// system_error
class _LIBCPP_TYPE_VIS system_error
: public runtime_error
{
error_code __ec_;
public:
system_error(error_code __ec, const string& __what_arg);
system_error(error_code __ec, const char* __what_arg);
system_error(error_code __ec);
system_error(int __ev, const error_category& __ecat, const string& __what_arg);
system_error(int __ev, const error_category& __ecat, const char* __what_arg);
system_error(int __ev, const error_category& __ecat);
system_error(const system_error&) _NOEXCEPT = default;
~system_error() _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
const error_code& code() const _NOEXCEPT {return __ec_;}
private:
static string __init(const error_code&, string);
};
_LIBCPP_NORETURN _LIBCPP_FUNC_VIS
void __throw_system_error(int ev, const char* what_arg);
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_SYSTEM_ERROR