locale_facets.h

mingw32.rar

       *  This virtual function converts each wchar_t in the range [lo,hi) to
       *  char using the simplest reasonable transformation and writes the
       *  results to the destination array.  For any wchar_t in the input that
       *  cannot be converted, @a dfault is used instead.  For an underived
       *  ctype<wchar_t> facet, the argument will be copied, casting each
       *  element to char.
       *
       *  do_narrow() is a hook for a derived facet to change the behavior of
       *  narrowing.  do_narrow() must always return the same result for the
       *  same input.
       *
       *  Note: this is not what you want for codepage conversions.  See
       *  codecvt for that.
       *
       *  @param lo  Pointer to start of range.
       *  @param hi  Pointer to end of range.
       *  @param dfault  Char to use if conversion fails.
       *  @param to  Pointer to the destination array.
       *  @return  @a hi.
      */
      virtual const char_type*
      do_narrow(const char_type* __lo, const char_type* __hi,
		char __dfault, char* __dest) const;

      // For use at construction time only.
      void
      _M_initialize_ctype();
    };

  template<>
    const ctype<wchar_t>&
    use_facet<ctype<wchar_t> >(const locale& __loc);
#endif //_GLIBCXX_USE_WCHAR_T

  // Include host and configuration specific ctype inlines.
  #include <bits/ctype_inline.h>

  // 22.2.1.2  Template class ctype_byname
  template<typename _CharT>
    class ctype_byname : public ctype<_CharT>
    {
    public:
      typedef _CharT		char_type;

      explicit
      ctype_byname(const char* __s, size_t __refs = 0);

    protected:
      virtual
      ~ctype_byname() { };
    };

  // 22.2.1.4  Class ctype_byname specializations.
  template<>
    ctype_byname<char>::ctype_byname(const char*, size_t refs);

  template<>
    ctype_byname<wchar_t>::ctype_byname(const char*, size_t refs);

  // 22.2.1.5  Template class codecvt
  #include <bits/codecvt.h>

  // 22.2.2  The numeric category.
  class __num_base
  {
  public:
    // NB: Code depends on the order of _S_atoms_out elements.
    // Below are the indices into _S_atoms_out.
    enum
      {
        _S_ominus,
        _S_oplus,
        _S_ox,
        _S_oX,
        _S_odigits,
        _S_odigits_end = _S_odigits + 16,
        _S_oudigits = _S_odigits_end,
        _S_oudigits_end = _S_oudigits + 16,
        _S_oe = _S_odigits + 14,  // For scientific notation, 'e'
        _S_oE = _S_oudigits + 14, // For scientific notation, 'E'
	_S_oend = _S_oudigits_end
      };

    // A list of valid numeric literals for output.  This array
    // contains chars that will be passed through the current locale's
    // ctype<_CharT>.widen() and then used to render numbers.
    // For the standard "C" locale, this is
    // "-+xX0123456789abcdef0123456789ABCDEF".
    static const char* _S_atoms_out;

    // String literal of acceptable (narrow) input, for num_get.
    // "-+xX0123456789abcdefABCDEF"
    static const char* _S_atoms_in;

    enum
    {
      _S_iminus,
      _S_iplus,
      _S_ix,
      _S_iX,
      _S_izero,
      _S_ie = _S_izero + 14,
      _S_iE = _S_izero + 20,
      _S_iend = 26
    };

    // num_put
    // Construct and return valid scanf format for floating point types.
    static void
    _S_format_float(const ios_base& __io, char* __fptr, char __mod);
  };

  template<typename _CharT>
    struct __numpunct_cache : public locale::facet
    {
      const char*			_M_grouping;
      size_t                            _M_grouping_size;
      bool				_M_use_grouping;
      const _CharT*			_M_truename;
      size_t                            _M_truename_size;
      const _CharT*			_M_falsename;
      size_t                            _M_falsename_size;
      _CharT				_M_decimal_point;
      _CharT				_M_thousands_sep;

      // A list of valid numeric literals for output: in the standard
      // "C" locale, this is "-+xX0123456789abcdef0123456789ABCDEF".
      // This array contains the chars after having been passed
      // through the current locale's ctype<_CharT>.widen().
      _CharT				_M_atoms_out[__num_base::_S_oend];

      // A list of valid numeric literals for input: in the standard
      // "C" locale, this is "-+xX0123456789abcdefABCDEF"
      // This array contains the chars after having been passed
      // through the current locale's ctype<_CharT>.widen().
      _CharT				_M_atoms_in[__num_base::_S_iend];

      bool				_M_allocated;

      __numpunct_cache(size_t __refs = 0) : facet(__refs),
      _M_grouping(NULL), _M_grouping_size(0), _M_use_grouping(false),
      _M_truename(NULL), _M_truename_size(0), _M_falsename(NULL),
      _M_falsename_size(0), _M_decimal_point(_CharT()),
      _M_thousands_sep(_CharT()), _M_allocated(false)
      { }

      ~__numpunct_cache();

      void
      _M_cache(const locale& __loc);

    private:
      __numpunct_cache&
      operator=(const __numpunct_cache&);
      
      explicit
      __numpunct_cache(const __numpunct_cache&);
    };

  template<typename _CharT>
    __numpunct_cache<_CharT>::~__numpunct_cache()
    {
      if (_M_allocated)
	{
	  delete [] _M_grouping;
	  delete [] _M_truename;
	  delete [] _M_falsename;
	}
    }

  /**
   *  @brief  Numpunct facet.
   *
   *  This facet stores several pieces of information related to printing and
   *  scanning numbers, such as the decimal point character.  It takes a
   *  template parameter specifying the char type.  The numpunct facet is
   *  used by streams for many I/O operations involving numbers.
   *
   *  The numpunct template uses protected virtual functions to provide the
   *  actual results.  The public accessors forward the call to the virtual
   *  functions.  These virtual functions are hooks for developers to
   *  implement the behavior they require from a numpunct facet.
  */
  template<typename _CharT>
    class numpunct : public locale::facet
    {
    public:
      // Types:
      //@{
      /// Public typedefs
      typedef _CharT			char_type;
      typedef basic_string<_CharT>	string_type;
      //@}
      typedef __numpunct_cache<_CharT>  __cache_type;

    protected:
      __cache_type*			_M_data;

    public:
      /// Numpunct facet id.
      static locale::id			id;

      /**
       *  @brief  Numpunct constructor.
       *
       *  @param  refs  Refcount to pass to the base class.
       */
      explicit
      numpunct(size_t __refs = 0) : facet(__refs), _M_data(NULL)
      { _M_initialize_numpunct(); }

      /**
       *  @brief  Internal constructor.  Not for general use.
       *
       *  This is a constructor for use by the library itself to set up the
       *  predefined locale facets.
       *
       *  @param  cache  __numpunct_cache object.
       *  @param  refs  Refcount to pass to the base class.
       */
      explicit
      numpunct(__cache_type* __cache, size_t __refs = 0)
      : facet(__refs), _M_data(__cache)
      { _M_initialize_numpunct(); }

      /**
       *  @brief  Internal constructor.  Not for general use.
       *
       *  This is a constructor for use by the library itself to set up new
       *  locales.
       *
       *  @param  cloc  The "C" locale.
       *  @param  refs  Refcount to pass to the base class.
       */
      explicit
      numpunct(__c_locale __cloc, size_t __refs = 0)
      : facet(__refs), _M_data(NULL)
      { _M_initialize_numpunct(__cloc); }

      /**
       *  @brief  Return decimal point character.
       *
       *  This function returns a char_type to use as a decimal point.  It
       *  does so by returning returning
       *  numpunct<char_type>::do_decimal_point().
       *
       *  @return  @a char_type representing a decimal point.
      */
      char_type
      decimal_point() const
      { return this->do_decimal_point(); }

      /**
       *  @brief  Return thousands separator character.
       *
       *  This function returns a char_type to use as a thousands
       *  separator.  It does so by returning returning
       *  numpunct<char_type>::do_thousands_sep().
       *
       *  @return  char_type representing a thousands separator.
      */
      char_type
      thousands_sep() const
      { return this->do_thousands_sep(); }

      /**
       *  @brief  Return grouping specification.
       *
       *  This function returns a string representing groupings for the
       *  integer part of a number.  Groupings indicate where thousands
       *  separators should be inserted in the integer part of a number.
       *
       *  Each char in the return string is interpret as an integer
       *  rather than a character.  These numbers represent the number
       *  of digits in a group.  The first char in the string
       *  represents the number of digits in the least significant
       *  group.  If a char is negative, it indicates an unlimited
       *  number of digits for the group.  If more chars from the
       *  string are required to group a number, the last char is used
       *  repeatedly.
       *
       *  For example, if the grouping() returns "\003\002" and is
       *  applied to the number 123456789, this corresponds to
       *  12,34,56,789.  Note that if the string was "32", this would
       *  put more than 50 digits into the least significant group if
       *  the character set is ASCII.
       *
       *  The string is returned by calling
       *  numpunct<char_type>::do_grouping().
       *
       *  @return  string representing grouping specification.
      */
      string
      grouping() const
      { return this->do_grouping(); }

      /**
       *  @brief  Return string representation of bool true.
       *
       *  This function returns a string_type containing the text
       *  representation for true bool variables.  It does so by calling
       *  numpunct<char_type>::do_truename().
       *
       *  @return  string_type representing printed form of true.
      */
      string_type
      truename() const
      { return this->do_truename(); }

      /**
       *  @brief  Return string representation of bool false.
       *
       *  This function returns a string_type containing the text
       *  representation for false bool variables.  It does so by calling
       *  numpunct<char_type>::do_falsename().
       *
       *  @return  string_type representing printed form of false.
      */
      string_type
      falsename() const
      { return this->do_falsename(); }

    protected:
      /// Destructor.
      virtual
      ~numpunct();

      /**
       *  @brief  Return decimal point character.
       *
       *  Returns a char_type to use as a decimal point.  This function is a
       *  hook for derived classes to change the value returned.
       *
       *  @return  @a char_type representing a decimal point.
      */
      virtual char_type
      do_decimal_point() const
      { return _M_data->_M_decimal_point; }

      /**
       *  @brief  Return thousands separator character.
       *
       *  Returns a char_type to use as a thousands separator.  This function
       *  is a hook for derived classes to change the value returned.
       *
       *  @return  @a char_type representing a thousands separator.
      */
      virtual char_type
      do_thousands_sep() const
      { return _M_data->_M_thousands_sep; }

      /**
       *  @brief  Return grouping specification.
       *
       *  Returns a string representing groupings for the integer part of a
       *  number.  This function is a hook for derived classes to change the
       *  value returned.  @see grouping() for details.
       *
       *  @return  String representing grouping specification.
      */
      virtual string
      do_grouping() const
      { return _M_data->_M_grouping; }

      /**
       *  @brief  Return string representation of bool true.
       *
       *  Returns a string_type containing the text representation for true