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//  -*- C++ -*-

// Copyright (C) 2007, 2008, 2009, 2010 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

// .

/** @file 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 

#else

#include 

#include 

#include 

#include 

_GLIBCXX_BEGIN_NAMESPACE(std)

  class error_code;

  class error_condition;

  class error_category;

  class system_error;

  /// is_error_code_enum

  template

    struct is_error_code_enum : public false_type { };

  /// is_error_condition_enum

  template

    struct is_error_condition_enum : public false_type { };

  template<>

    struct is_error_condition_enum

    : public true_type { };

  /// error_category

  class error_category

  {

  protected:

    error_category();

  public:

    virtual ~error_category() { }

    error_category(const error_category&) = delete;

    error_category& operator=(const error_category&) = delete;

    virtual const char*

    name() const = 0;

    virtual string

    message(int) const = 0;

    virtual error_condition

    default_error_condition(int __i) const;

    virtual bool

    equivalent(int __i, const error_condition& __cond) const;

    virtual bool

    equivalent(const error_code& __code, int __i) const;

    bool

    operator<(const error_category& __other) const

    { return less()(this, &__other); }

    bool

    operator==(const error_category& __other) const

    { return this == &__other; }

    bool

    operator!=(const error_category& __other) const

    { return this != &__other; }

  };

  inline error_category::error_category() = default;

  // DR 890.

  _GLIBCXX_CONST const error_category& system_category() throw();

  _GLIBCXX_CONST const error_category& generic_category() throw();

  error_code make_error_code(errc);

  template

    struct hash;

  /// error_code

  // Implementation-specific error identification

  struct error_code

  {

    error_code()

    : _M_value(0), _M_cat(&system_category()) { }

    error_code(int __v, const error_category& __cat)

    : _M_value(__v), _M_cat(&__cat) { }

    template

      error_code(_ErrorCodeEnum __e,

      typename enable_if::value>::type* = 0)

      { *this = make_error_code(__e); }

    void

    assign(int __v, const error_category& __cat)

    {

      _M_value = __v;

      _M_cat = &__cat;

    }

    void

    clear()

    { assign(0, system_category()); }

    // DR 804.

    template

      typename enable_if::value,

                         error_code&>::type

      operator=(_ErrorCodeEnum __e)

      { return *this = make_error_code(__e); }

    int

    value() const { return _M_value; }

    const error_category&

    category() const { return *_M_cat; }

    error_condition

    default_error_condition() const;

    string

    message() const

    { return category().message(value()); }

    explicit operator bool() const

    { return _M_value != 0 ? true : false; }

    // DR 804.

  private:

    friend class hash;

    int                         _M_value;

    const error_category*       _M_cat;

  };

  // 19.4.2.6 non-member functions

  inline error_code

  make_error_code(errc __e)

  { return error_code(static_cast(__e), generic_category()); }

  inline bool

  operator<(const error_code& __lhs, const error_code& __rhs)

  {

    return (__lhs.category() < __rhs.category()

            || (__lhs.category() == __rhs.category()

                && __lhs.value() < __rhs.value()));

  }

  template

    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);

  /// error_condition

  // Portable error identification

  struct error_condition

  {

    error_condition()

    : _M_value(0), _M_cat(&generic_category()) { }

    error_condition(int __v, const error_category& __cat)

    : _M_value(__v), _M_cat(&__cat) { }

    template

      error_condition(_ErrorConditionEnum __e,

                      typename enable_if

                                      <_ErrorConditionEnum>::value>::type* = 0)

      { *this = make_error_condition(__e); }

    void

    assign(int __v, const error_category& __cat)

    {

      _M_value = __v;

      _M_cat = &__cat;

    }

    // DR 804.

    template

      typename enable_if

                         <_ErrorConditionEnum>::value, error_condition&>::type

      operator=(_ErrorConditionEnum __e)

      { return *this = make_error_condition(__e); }

    void

    clear()

    { assign(0, generic_category()); }

    // 19.4.3.4 observers

    int

    value() const { return _M_value; }

    const error_category&

    category() const { return *_M_cat; }

    string

    message() const

    { return category().message(value()); }

    explicit operator bool() const

    { 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)

  { return error_condition(static_cast(__e), generic_category()); }

  inline bool

  operator<(const error_condition& __lhs, const error_condition& __rhs)

  {

    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)

  { return (__lhs.category() == __rhs.category()

            && __lhs.value() == __rhs.value()); }

  inline bool

  operator==(const error_code& __lhs, const error_condition& __rhs)

  {

    return (__lhs.category().equivalent(__lhs.value(), __rhs)

            || __rhs.category().equivalent(__lhs, __rhs.value()));

  }

  inline bool

  operator==(const error_condition& __lhs, const error_code& __rhs)

  {

    return (__rhs.category().equivalent(__rhs.value(), __lhs)

            || __lhs.category().equivalent(__rhs, __lhs.value()));

  }

  inline bool

  operator==(const error_condition& __lhs, const error_condition& __rhs)

  {

    return (__lhs.category() == __rhs.category()

            && __lhs.value() == __rhs.value());

  }

  inline bool

  operator!=(const error_code& __lhs, const error_code& __rhs)

  { return !(__lhs == __rhs); }

  inline bool

  operator!=(const error_code& __lhs, const error_condition& __rhs)

  { return !(__lhs == __rhs); }

  inline bool

  operator!=(const error_condition& __lhs, const error_code& __rhs)

  { return !(__lhs == __rhs); }

  inline bool

  operator!=(const error_condition& __lhs, const error_condition& __rhs)

  { 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(""), _M_code(__ec) { }

    system_error(error_code __ec, const string& __what)

    : runtime_error(__what), _M_code(__ec) { }

    /*

     * TODO: Add const char* ctors to all exceptions.

     *

     * system_error(error_code __ec, const char* __what)

     * : runtime_error(__what), _M_code(__ec) { }

     *

     * system_error(int __v, const error_category& __ecat, const char* __what)

     * : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }

     */

    system_error(int __v, const error_category& __ecat)

    : runtime_error(""), _M_code(error_code(__v, __ecat)) { }

    system_error(int __v, const error_category& __ecat, const string& __what)

    : 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

#ifndef _GLIBCXX_COMPATIBILITY_CXX0X

#include 

_GLIBCXX_BEGIN_NAMESPACE(std)

  // DR 1182.

  /// std::hash specialization for error_code.

  template<>

    struct hash

    : public std::unary_function

    {

      size_t

      operator()(const error_code& __e) const

      {

        const size_t __tmp = std::_Fnv_hash::hash(__e._M_value);

        return std::_Fnv_hash::__hash_combine(__e._M_cat, __tmp);

      }

    };

_GLIBCXX_END_NAMESPACE

#endif // _GLIBCXX_COMPATIBILITY_CXX0X

#endif // __GXX_EXPERIMENTAL_CXX0X__

#endif // _GLIBCXX_SYSTEM_ERROR