aa118a03c4
From-SVN: r206301
382 lines
10 KiB
C++
382 lines
10 KiB
C++
// <system_error> -*- C++ -*-
|
|
|
|
// Copyright (C) 2007-2014 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file include/system_error
|
|
* This is a Standard C++ Library header.
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_SYSTEM_ERROR
|
|
#define _GLIBCXX_SYSTEM_ERROR 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#if __cplusplus < 201103L
|
|
# include <bits/c++0x_warning.h>
|
|
#else
|
|
|
|
#include <bits/c++config.h>
|
|
#include <bits/error_constants.h>
|
|
#include <iosfwd>
|
|
#include <stdexcept>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
class error_code;
|
|
class error_condition;
|
|
class error_category;
|
|
class system_error;
|
|
|
|
/// is_error_code_enum
|
|
template<typename _Tp>
|
|
struct is_error_code_enum : public false_type { };
|
|
|
|
/// is_error_condition_enum
|
|
template<typename _Tp>
|
|
struct is_error_condition_enum : public false_type { };
|
|
|
|
template<>
|
|
struct is_error_condition_enum<errc>
|
|
: public true_type { };
|
|
|
|
|
|
/// error_category
|
|
class error_category
|
|
{
|
|
public:
|
|
#ifdef _GLIBCXX_COMPATIBILITY_CXX0X
|
|
error_category() noexcept;
|
|
#else
|
|
constexpr error_category() noexcept = default;
|
|
#endif
|
|
|
|
virtual ~error_category();
|
|
|
|
error_category(const error_category&) = delete;
|
|
error_category& operator=(const error_category&) = delete;
|
|
|
|
virtual const char*
|
|
name() const noexcept = 0;
|
|
|
|
virtual string
|
|
message(int) const = 0;
|
|
|
|
virtual error_condition
|
|
default_error_condition(int __i) const noexcept;
|
|
|
|
virtual bool
|
|
equivalent(int __i, const error_condition& __cond) const noexcept;
|
|
|
|
virtual bool
|
|
equivalent(const error_code& __code, int __i) const noexcept;
|
|
|
|
bool
|
|
operator<(const error_category& __other) const noexcept
|
|
{ return less<const error_category*>()(this, &__other); }
|
|
|
|
bool
|
|
operator==(const error_category& __other) const noexcept
|
|
{ return this == &__other; }
|
|
|
|
bool
|
|
operator!=(const error_category& __other) const noexcept
|
|
{ return this != &__other; }
|
|
};
|
|
|
|
// DR 890.
|
|
_GLIBCXX_CONST const error_category& system_category() noexcept;
|
|
_GLIBCXX_CONST const error_category& generic_category() noexcept;
|
|
|
|
error_code make_error_code(errc) noexcept;
|
|
|
|
template<typename _Tp>
|
|
struct hash;
|
|
|
|
/// error_code
|
|
// Implementation-specific error identification
|
|
struct error_code
|
|
{
|
|
error_code() noexcept
|
|
: _M_value(0), _M_cat(&system_category()) { }
|
|
|
|
error_code(int __v, const error_category& __cat) noexcept
|
|
: _M_value(__v), _M_cat(&__cat) { }
|
|
|
|
template<typename _ErrorCodeEnum, typename = typename
|
|
enable_if<is_error_code_enum<_ErrorCodeEnum>::value>::type>
|
|
error_code(_ErrorCodeEnum __e) noexcept
|
|
{ *this = make_error_code(__e); }
|
|
|
|
void
|
|
assign(int __v, const error_category& __cat) noexcept
|
|
{
|
|
_M_value = __v;
|
|
_M_cat = &__cat;
|
|
}
|
|
|
|
void
|
|
clear() noexcept
|
|
{ assign(0, system_category()); }
|
|
|
|
// DR 804.
|
|
template<typename _ErrorCodeEnum>
|
|
typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value,
|
|
error_code&>::type
|
|
operator=(_ErrorCodeEnum __e) noexcept
|
|
{ return *this = make_error_code(__e); }
|
|
|
|
int
|
|
value() const noexcept { return _M_value; }
|
|
|
|
const error_category&
|
|
category() const noexcept { return *_M_cat; }
|
|
|
|
error_condition
|
|
default_error_condition() const noexcept;
|
|
|
|
string
|
|
message() const
|
|
{ return category().message(value()); }
|
|
|
|
explicit operator bool() const noexcept
|
|
{ return _M_value != 0 ? true : false; }
|
|
|
|
// DR 804.
|
|
private:
|
|
friend class hash<error_code>;
|
|
|
|
int _M_value;
|
|
const error_category* _M_cat;
|
|
};
|
|
|
|
// 19.4.2.6 non-member functions
|
|
inline error_code
|
|
make_error_code(errc __e) noexcept
|
|
{ return error_code(static_cast<int>(__e), generic_category()); }
|
|
|
|
inline bool
|
|
operator<(const error_code& __lhs, const error_code& __rhs) noexcept
|
|
{
|
|
return (__lhs.category() < __rhs.category()
|
|
|| (__lhs.category() == __rhs.category()
|
|
&& __lhs.value() < __rhs.value()));
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
|
|
{ return (__os << __e.category().name() << ':' << __e.value()); }
|
|
|
|
error_condition make_error_condition(errc) noexcept;
|
|
|
|
/// error_condition
|
|
// Portable error identification
|
|
struct error_condition
|
|
{
|
|
error_condition() noexcept
|
|
: _M_value(0), _M_cat(&generic_category()) { }
|
|
|
|
error_condition(int __v, const error_category& __cat) noexcept
|
|
: _M_value(__v), _M_cat(&__cat) { }
|
|
|
|
template<typename _ErrorConditionEnum, typename = typename
|
|
enable_if<is_error_condition_enum<_ErrorConditionEnum>::value>::type>
|
|
error_condition(_ErrorConditionEnum __e) noexcept
|
|
{ *this = make_error_condition(__e); }
|
|
|
|
void
|
|
assign(int __v, const error_category& __cat) noexcept
|
|
{
|
|
_M_value = __v;
|
|
_M_cat = &__cat;
|
|
}
|
|
|
|
// DR 804.
|
|
template<typename _ErrorConditionEnum>
|
|
typename enable_if<is_error_condition_enum
|
|
<_ErrorConditionEnum>::value, error_condition&>::type
|
|
operator=(_ErrorConditionEnum __e) noexcept
|
|
{ return *this = make_error_condition(__e); }
|
|
|
|
void
|
|
clear() noexcept
|
|
{ assign(0, generic_category()); }
|
|
|
|
// 19.4.3.4 observers
|
|
int
|
|
value() const noexcept { return _M_value; }
|
|
|
|
const error_category&
|
|
category() const noexcept { return *_M_cat; }
|
|
|
|
string
|
|
message() const
|
|
{ return category().message(value()); }
|
|
|
|
explicit operator bool() const noexcept
|
|
{ return _M_value != 0 ? true : false; }
|
|
|
|
// DR 804.
|
|
private:
|
|
int _M_value;
|
|
const error_category* _M_cat;
|
|
};
|
|
|
|
// 19.4.3.6 non-member functions
|
|
inline error_condition
|
|
make_error_condition(errc __e) noexcept
|
|
{ return error_condition(static_cast<int>(__e), generic_category()); }
|
|
|
|
inline bool
|
|
operator<(const error_condition& __lhs,
|
|
const error_condition& __rhs) noexcept
|
|
{
|
|
return (__lhs.category() < __rhs.category()
|
|
|| (__lhs.category() == __rhs.category()
|
|
&& __lhs.value() < __rhs.value()));
|
|
}
|
|
|
|
// 19.4.4 Comparison operators
|
|
inline bool
|
|
operator==(const error_code& __lhs, const error_code& __rhs) noexcept
|
|
{ return (__lhs.category() == __rhs.category()
|
|
&& __lhs.value() == __rhs.value()); }
|
|
|
|
inline bool
|
|
operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
|
|
{
|
|
return (__lhs.category().equivalent(__lhs.value(), __rhs)
|
|
|| __rhs.category().equivalent(__lhs, __rhs.value()));
|
|
}
|
|
|
|
inline bool
|
|
operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
|
|
{
|
|
return (__rhs.category().equivalent(__rhs.value(), __lhs)
|
|
|| __lhs.category().equivalent(__rhs, __lhs.value()));
|
|
}
|
|
|
|
inline bool
|
|
operator==(const error_condition& __lhs,
|
|
const error_condition& __rhs) noexcept
|
|
{
|
|
return (__lhs.category() == __rhs.category()
|
|
&& __lhs.value() == __rhs.value());
|
|
}
|
|
|
|
inline bool
|
|
operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
inline bool
|
|
operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
inline bool
|
|
operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
inline bool
|
|
operator!=(const error_condition& __lhs,
|
|
const error_condition& __rhs) noexcept
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
|
|
/**
|
|
* @brief Thrown to indicate error code of underlying system.
|
|
*
|
|
* @ingroup exceptions
|
|
*/
|
|
class system_error : public std::runtime_error
|
|
{
|
|
private:
|
|
error_code _M_code;
|
|
|
|
public:
|
|
system_error(error_code __ec = error_code())
|
|
: runtime_error(__ec.message()), _M_code(__ec) { }
|
|
|
|
system_error(error_code __ec, const string& __what)
|
|
: runtime_error(__what + ": " + __ec.message()), _M_code(__ec) { }
|
|
|
|
/*
|
|
* TODO: Add const char* ctors to all exceptions.
|
|
*
|
|
* system_error(error_code __ec, const char* __what)
|
|
* : runtime_error(__what + (": " + __ec.message())), _M_code(__ec) { }
|
|
*
|
|
* system_error(int __v, const error_category& __ecat, const char* __what)
|
|
* : runtime_error(__what + (": " + __ec.message())),
|
|
* _M_code(error_code(__v, __ecat)) { }
|
|
*/
|
|
|
|
system_error(int __v, const error_category& __ecat)
|
|
: runtime_error(error_code(__v, __ecat).message()),
|
|
_M_code(__v, __ecat) { }
|
|
|
|
system_error(int __v, const error_category& __ecat, const string& __what)
|
|
: runtime_error(__what + ": " + error_code(__v, __ecat).message()),
|
|
_M_code(__v, __ecat) { }
|
|
|
|
virtual ~system_error() noexcept;
|
|
|
|
const error_code&
|
|
code() const noexcept { return _M_code; }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#ifndef _GLIBCXX_COMPATIBILITY_CXX0X
|
|
|
|
#include <bits/functional_hash.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
// DR 1182.
|
|
/// std::hash specialization for error_code.
|
|
template<>
|
|
struct hash<error_code>
|
|
: public __hash_base<size_t, error_code>
|
|
{
|
|
size_t
|
|
operator()(const error_code& __e) const noexcept
|
|
{
|
|
const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
|
|
return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
|
|
}
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif // _GLIBCXX_COMPATIBILITY_CXX0X
|
|
|
|
#endif // C++11
|
|
|
|
#endif // _GLIBCXX_SYSTEM_ERROR
|