ios_base.h

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      { return __gnu_cxx::__exchange_and_add(&_M_refcount, -1); }
    };

     _Callback_list*	_M_callbacks;

    void
    _M_call_callbacks(event __ev) throw();

    void
    _M_dispose_callbacks(void);

    // 27.4.2.5  Members for iword/pword storage
    struct _Words
    {
      void*	_M_pword;
      long	_M_iword;
      _Words() : _M_pword(0), _M_iword(0) { }
    };

    // Only for failed iword/pword calls.
    _Words		_M_word_zero;

    // Guaranteed storage.
    // The first 5 iword and pword slots are reserved for internal use.
    static const int	_S_local_word_size = 8;
    _Words		_M_local_word[_S_local_word_size];

    // Allocated storage.
    int			_M_word_size;
    _Words*		_M_word;

    _Words&
    _M_grow_words(int __index, bool __iword);

    // Members for locale and locale caching.
    locale		_M_ios_locale;

    void
    _M_init();

  public:

    // 27.4.2.1.6  Class ios_base::Init
    // Used to initialize standard streams. In theory, g++ could use
    // -finit-priority to order this stuff correctly without going
    // through these machinations.
    class Init
    {
      friend class ios_base;
    public:
      Init();
      ~Init();

    private:
      static _Atomic_word	_S_refcount;
      static bool		_S_synced_with_stdio;
    };

    // [27.4.2.2] fmtflags state functions
    /**
     *  @brief  Access to format flags.
     *  @return  The format control flags for both input and output.
    */
    inline fmtflags
    flags() const { return _M_flags; }

    /**
     *  @brief  Setting new format flags all at once.
     *  @param  fmtfl  The new flags to set.
     *  @return  The previous format control flags.
     *
     *  This function overwrites all the format flags with @a fmtfl.
    */
    inline fmtflags
    flags(fmtflags __fmtfl)
    {
      fmtflags __old = _M_flags;
      _M_flags = __fmtfl;
      return __old;
    }

    /**
     *  @brief  Setting new format flags.
     *  @param  fmtfl  Additional flags to set.
     *  @return  The previous format control flags.
     *
     *  This function sets additional flags in format control.  Flags that
     *  were previously set remain set.
    */
    inline fmtflags
    setf(fmtflags __fmtfl)
    {
      fmtflags __old = _M_flags;
      _M_flags |= __fmtfl;
      return __old;
    }

    /**
     *  @brief  Setting new format flags.
     *  @param  fmtfl  Additional flags to set.
     *  @param  mask  The flags mask for @a fmtfl.
     *  @return  The previous format control flags.
     *
     *  This function clears @a mask in the format flags, then sets
     *  @a fmtfl @c & @a mask.  An example mask is @c ios_base::adjustfield.
    */
    inline fmtflags
    setf(fmtflags __fmtfl, fmtflags __mask)
    {
      fmtflags __old = _M_flags;
      _M_flags &= ~__mask;
      _M_flags |= (__fmtfl & __mask);
      return __old;
    }

    /**
     *  @brief  Clearing format flags.
     *  @param  mask  The flags to unset.
     *
     *  This function clears @a mask in the format flags.
    */
    inline void
    unsetf(fmtflags __mask) { _M_flags &= ~__mask; }

    /**
     *  @brief  Flags access.
     *  @return  The precision to generate on certain output operations.
     *
     *  @if maint
     *  Be careful if you try to give a definition of "precision" here; see
     *  DR 189.
     *  @endif
    */
    inline streamsize
    precision() const { return _M_precision; }

    /**
     *  @brief  Changing flags.
     *  @param  prec  The new precision value.
     *  @return  The previous value of precision().
    */
    inline streamsize
    precision(streamsize __prec)
    {
      streamsize __old = _M_precision;
      _M_precision = __prec;
      return __old;
    }

    /**
     *  @brief  Flags access.
     *  @return  The minimum field width to generate on output operations.
     *
     *  "Minimum field width" refers to the number of characters.
    */
    inline streamsize
    width() const { return _M_width; }

    /**
     *  @brief  Changing flags.
     *  @param  wide  The new width value.
     *  @return  The previous value of width().
    */
    inline streamsize
    width(streamsize __wide)
    {
      streamsize __old = _M_width;
      _M_width = __wide;
      return __old;
    }

    // [27.4.2.4] ios_base static members
    /**
     *  @brief  Interaction with the standard C I/O objects.
     *  @param  sync  Whether to synchronize or not.
     *  @return  True if the standard streams were previously synchronized.
     *
     *  The synchronization referred to is @e only that between the standard
     *  C facilities (e.g., stdout) and the standard C++ objects (e.g.,
     *  cout).  User-declared streams are unaffected.  See
     *  http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#8 for more.
    */
    static bool
    sync_with_stdio(bool __sync = true);

    // [27.4.2.3] ios_base locale functions
    /**
     *  @brief  Setting a new locale.
     *  @param  loc  The new locale.
     *  @return  The previous locale.
     *
     *  Sets the new locale for this stream, and then invokes each callback
     *  with imbue_event.
    */
    locale
    imbue(const locale& __loc);

    /**
     *  @brief  Locale access
     *  @return  A copy of the current locale.
     *
     *  If @c imbue(loc) has previously been called, then this function
     *  returns @c loc.  Otherwise, it returns a copy of @c std::locale(),
     *  the global C++ locale.
    */
    inline locale
    getloc() const { return _M_ios_locale; }

    /**
     *  @brief  Locale access
     *  @return  A reference to the current locale.
     *
     *  Like getloc above, but returns a reference instead of
     *  generating a copy.
    */
    inline const locale&
    _M_getloc() const { return _M_ios_locale; }

    // [27.4.2.5] ios_base storage functions
    /**
     *  @brief  Access to unique indices.
     *  @return  An integer different from all previous calls.
     *
     *  This function returns a unique integer every time it is called.  It
     *  can be used for any purpose, but is primarily intended to be a unique
     *  index for the iword and pword functions.  The expectation is that an
     *  application calls xalloc in order to obtain an index in the iword and
     *  pword arrays that can be used without fear of conflict.
     *
     *  The implementation maintains a static variable that is incremented and
     *  returned on each invocation.  xalloc is guaranteed to return an index
     *  that is safe to use in the iword and pword arrays.
    */
    static int
    xalloc() throw();

    /**
     *  @brief  Access to integer array.
     *  @param  __ix  Index into the array.
     *  @return  A reference to an integer associated with the index.
     *
     *  The iword function provides access to an array of integers that can be
     *  used for any purpose.  The array grows as required to hold the
     *  supplied index.  All integers in the array are initialized to 0.
     *
     *  The implementation reserves several indices.  You should use xalloc to
     *  obtain an index that is safe to use.  Also note that since the array
     *  can grow dynamically, it is not safe to hold onto the reference.
    */
    inline long&
    iword(int __ix)
    {
      _Words& __word = (__ix < _M_word_size)
			? _M_word[__ix] : _M_grow_words(__ix, true);
      return __word._M_iword;
    }

    /**
     *  @brief  Access to void pointer array.
     *  @param  __ix  Index into the array.
     *  @return  A reference to a void* associated with the index.
     *
     *  The pword function provides access to an array of pointers that can be
     *  used for any purpose.  The array grows as required to hold the
     *  supplied index.  All pointers in the array are initialized to 0.
     *
     *  The implementation reserves several indices.  You should use xalloc to
     *  obtain an index that is safe to use.  Also note that since the array
     *  can grow dynamically, it is not safe to hold onto the reference.
    */
    inline void*&
    pword(int __ix)
    {
      _Words& __word = (__ix < _M_word_size)
			? _M_word[__ix] : _M_grow_words(__ix, false);
      return __word._M_pword;
    }

    // Destructor
    /**
     *  Invokes each callback with erase_event.  Destroys local storage.
     *
     *  Note that the ios_base object for the standard streams never gets
     *  destroyed.  As a result, any callbacks registered with the standard
     *  streams will not get invoked with erase_event (unless copyfmt is
     *  used).
    */
    virtual ~ios_base();

  protected:
    ios_base();

  // _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 50.  Copy constructor and assignment operator of ios_base
  private:
    ios_base(const ios_base&);

    ios_base&
    operator=(const ios_base&);
  };

  // [27.4.5.1] fmtflags manipulators
  /// Calls base.setf(ios_base::boolalpha).
  inline ios_base&
  boolalpha(ios_base& __base)
  {
    __base.setf(ios_base::boolalpha);
    return __base;
  }

  /// Calls base.unsetf(ios_base::boolalpha).
  inline ios_base&
  noboolalpha(ios_base& __base)
  {
    __base.unsetf(ios_base::boolalpha);
    return __base;
  }

  /// Calls base.setf(ios_base::showbase).
  inline ios_base&
  showbase(ios_base& __base)
  {
    __base.setf(ios_base::showbase);
    return __base;
  }

  /// Calls base.unsetf(ios_base::showbase).
  inline ios_base&
  noshowbase(ios_base& __base)
  {
    __base.unsetf(ios_base::showbase);
    return __base;
  }

  /// Calls base.setf(ios_base::showpoint).
  inline ios_base&
  showpoint(ios_base& __base)
  {
    __base.setf(ios_base::showpoint);
    return __base;
  }

  /// Calls base.unsetf(ios_base::showpoint).
  inline ios_base&
  noshowpoint(ios_base& __base)
  {
    __base.unsetf(ios_base::showpoint);
    return __base;
  }

  /// Calls base.setf(ios_base::showpos).
  inline ios_base&
  showpos(ios_base& __base)
  {
    __base.setf(ios_base::showpos);
    return __base;
  }

  /// Calls base.unsetf(ios_base::showpos).
  inline ios_base&
  noshowpos(ios_base& __base)
  {
    __base.unsetf(ios_base::showpos);
    return __base;
  }

  /// Calls base.setf(ios_base::skipws).
  inline ios_base&
  skipws(ios_base& __base)
  {
    __base.setf(ios_base::skipws);
    return __base;
  }

  /// Calls base.unsetf(ios_base::skipws).
  inline ios_base&
  noskipws(ios_base& __base)
  {
    __base.unsetf(ios_base::skipws);
    return __base;
  }

  /// Calls base.setf(ios_base::uppercase).
  inline ios_base&
  uppercase(ios_base& __base)
  {
    __base.setf(ios_base::uppercase);
    return __base;
  }

  /// Calls base.unsetf(ios_base::uppercase).
  inline ios_base&
  nouppercase(ios_base& __base)
  {
    __base.unsetf(ios_base::uppercase);
    return __base;
  }

  /// Calls base.setf(ios_base::unitbuf).
  inline ios_base&
  unitbuf(ios_base& __base)
  {
     __base.setf(ios_base::unitbuf);
     return __base;
  }

  /// Calls base.unsetf(ios_base::unitbuf).
  inline ios_base&
  nounitbuf(ios_base& __base)
  {
     __base.unsetf(ios_base::unitbuf);
     return __base;
  }

  // [27.4.5.2] adjustfield anipulators
  /// Calls base.setf(ios_base::internal, ios_base::adjustfield).
  inline ios_base&
  internal(ios_base& __base)
  {
     __base.setf(ios_base::internal, ios_base::adjustfield);
     return __base;
  }

  /// Calls base.setf(ios_base::left, ios_base::adjustfield).
  inline ios_base&
  left(ios_base& __base)
  {
    __base.setf(ios_base::left, ios_base::adjustfield);
    return __base;
  }

  /// Calls base.setf(ios_base::right, ios_base::adjustfield).
  inline ios_base&
  right(ios_base& __base)
  {
    __base.setf(ios_base::right, ios_base::adjustfield);
    return __base;
  }

  // [27.4.5.3] basefield anipulators
  /// Calls base.setf(ios_base::dec, ios_base::basefield).
  inline ios_base&
  dec(ios_base& __base)
  {
    __base.setf(ios_base::dec, ios_base::basefield);
    return __base;
  }

  /// Calls base.setf(ios_base::hex, ios_base::basefield).
  inline ios_base&
  hex(ios_base& __base)
  {
    __base.setf(ios_base::hex, ios_base::basefield);
    return __base;
  }

  /// Calls base.setf(ios_base::oct, ios_base::basefield).
  inline ios_base&
  oct(ios_base& __base)
  {
    __base.setf(ios_base::oct, ios_base::basefield);
    return __base;
  }

  // [27.4.5.4] floatfield anipulators
  /// Calls base.setf(ios_base::fixed, ios_base::floatfield).
  inline ios_base&
  fixed(ios_base& __base)
  {
    __base.setf(ios_base::fixed, ios_base::floatfield);
    return __base;
  }

  /// Calls base.setf(ios_base::scientific, ios_base::floatfield).
  inline ios_base&
  scientific(ios_base& __base)
  {
    __base.setf(ios_base::scientific, ios_base::floatfield);
    return __base;
  }
} // namespace std

#endif /* _IOS_BASE_H */