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// <system_error> -*- C++ -*-
// Copyright (C) 2007 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 2, 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.
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file include/system_error
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_SYSTEM_ERROR
#define _GLIBCXX_SYSTEM_ERROR 1
#pragma GCC system_header
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <c++0x_warning.h>
#endif
#include <bits/c++config.h>
#include <bits/error_constants.h>
#include <iosfwd>
#include <stdexcept>
_GLIBCXX_BEGIN_NAMESPACE(std)
class system_error;
class error_code;
class error_category;
extern const error_category& system_category;
/// error_category
struct error_category
{
error_category() { }
bool
operator==(const error_category& __other) const
{ return this == &__other; }
bool
operator!=(const error_category& __other) const
{ return this != &__other; }
virtual posix_error::posix_errno
posix(int __v) const = 0;
virtual const string&
name() const = 0;
private:
error_category(const error_category&);
error_category&
operator=(const error_category&);
};
/// error_code
struct error_code
{
error_code() throw()
: _M_value(0), _M_cat(&system_category) { }
error_code(int __v, const error_category& __cat) throw()
: _M_value(__v), _M_cat(&__cat) { }
error_code(posix_error::posix_errno __v)
: _M_value(__v), _M_cat(&system_category) { }
void
assign(int __v, const error_category& __cat) throw()
{
_M_value = __v;
_M_cat = &__cat;
}
void
clear() throw()
{
_M_value = 0;
_M_cat = &system_category;
}
int
value() const throw() { return _M_value; }
const error_category&
category() const { return *_M_cat; }
posix_error::posix_errno
posix() const throw() { return this->category().posix(_M_value); }
// Safe bool idiom.
// explicit operator bool() const throw()
// { return _M_value != 0; }
typedef void (*__bool_type)();
static void __not_bool_type() { }
operator __bool_type() const throw()
{ return _M_value != 0 ? &__not_bool_type : false; }
bool operator==(const error_code& __other) const
{ return value() == __other.value() && category() == __other.category(); }
bool operator!=(const error_code& __other) const
{ return !(this == &__other); }
private:
int _M_value;
const error_category* _M_cat;
};
/// Thrown to indicate error code of underlying system.
class system_error : public std::runtime_error
{
private:
error_code _M_code;
public:
system_error(const string& __what, error_code __ec = error_code())
: runtime_error(__what), _M_code(__ec) { }
system_error(const string& __what, int __v, const error_category& __ecat)
: runtime_error(__what), _M_code(error_code(__v, __ecat)) { }
virtual ~system_error() throw();
const error_code&
code() const throw() { return _M_code; }
};
_GLIBCXX_END_NAMESPACE
#endif
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