_limits.h

/*
 * Copyright (c) 1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Copyright (c) 1999 
 * Boris Fomitchev
 *
 * This material is provided "as is", with absolutely no warranty expressed
 * or implied. Any use is at your own risk.
 *
 * Permission to use or copy this software for any purpose is hereby granted 
 * without fee, provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 */

/* NOTE: This may be not portable code. Parts of numeric_limits<> are
 * inherently machine-dependent.  At present this file is suitable
 * for the MIPS, SPARC, Alpha and ia32 architectures.
 */

#ifndef _STLP_INTERNAL_LIMITS_H
# define _STLP_INTERNAL_LIMITS_H

#ifndef _STLP_CLIMITS
# include <climits>
#endif

#ifndef _STLP_CFLOAT
# include <cfloat>
#endif

#if !defined (_STLP_NO_WCHAR_T)
# include <cwchar>
#endif

_STLP_BEGIN_NAMESPACE

enum float_round_style {
  round_indeterminate       = -1,
  round_toward_zero         =  0,
  round_to_nearest          =  1,
  round_toward_infinity     =  2,
  round_toward_neg_infinity =  3
};

enum float_denorm_style {
  denorm_indeterminate = -1,
  denorm_absent        =  0,
  denorm_present       =  1
};

// Base class for all specializations of numeric_limits.

template <class __number>
class _Numeric_limits_base {
public:

  static __number (_STLP_CALL min)() _STLP_NOTHROW { return __number(); }
  static __number (_STLP_CALL max)() _STLP_NOTHROW { return __number(); }

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  enum {
# else
  static const int 
# endif
  
  digits = 0,
  digits10 = 0,
  radix = 0,
  min_exponent = 0,
  min_exponent10 = 0,
  max_exponent = 0,
  max_exponent10 = 0

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  ,  
  has_denorm = denorm_absent,
  round_style = round_toward_zero,
# else
  ;
  static const float_denorm_style has_denorm =  denorm_absent;
  static const float_round_style round_style = round_toward_zero;
  static const bool 
# endif

    is_specialized = false,
    is_signed  = false,
    is_integer = false,
    is_exact = false,
    has_infinity = false,
    has_quiet_NaN = false,
    has_signaling_NaN = false,
    has_denorm_loss = false,
    is_iec559 = false,
    is_bounded = false,
    is_modulo = false,
    traps = false,
    tinyness_before = false
# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  }
# endif
  ;
    
  static __number _STLP_CALL epsilon() _STLP_NOTHROW     { return __number(); }
  static __number _STLP_CALL round_error() _STLP_NOTHROW { return __number(); }

  static __number _STLP_CALL infinity() _STLP_NOTHROW      { return __number(); }
  static __number _STLP_CALL quiet_NaN() _STLP_NOTHROW     { return __number(); }
  static __number _STLP_CALL signaling_NaN() _STLP_NOTHROW { return __number(); }
  static __number _STLP_CALL denorm_min() _STLP_NOTHROW    { return __number(); }


};

// Base class for integers.

# ifdef _STLP_LIMITED_DEFAULT_TEMPLATES
#  ifdef _STLP_LONG_LONG
#   define _STLP_LIMITS_MIN_TYPE _STLP_LONG_LONG
#   define _STLP_LIMITS_MAX_TYPE unsigned _STLP_LONG_LONG
#  else
#   define _STLP_LIMITS_MIN_TYPE long
#   define _STLP_LIMITS_MAX_TYPE unsigned long
#  endif
# else
#   define _STLP_LIMITS_MIN_TYPE _Int
#   define _STLP_LIMITS_MAX_TYPE _Int
# endif /* _STLP_LIMITED_DEFAULT_TEMPLATES */

template <class _Int,
          _STLP_LIMITS_MIN_TYPE __imin,
          _STLP_LIMITS_MAX_TYPE __imax,
          int __idigits, bool __ismod>
class _Integer_limits : public _Numeric_limits_base<_Int> 
{
public:

  static _Int (_STLP_CALL min) () _STLP_NOTHROW { return (_Int)__imin; }
  static _Int (_STLP_CALL max) () _STLP_NOTHROW { return (_Int)__imax; }

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  enum {
# else
  static const int 
# endif  
  digits = (__idigits < 0) ?
  ((int)((sizeof(_Int) * (CHAR_BIT))) - ((__imin == 0) ? 0 : 1))
  : (__idigits),
  digits10 = (digits * 301UL) / 1000,
  radix = 2
# if ! defined ( _STLP_STATIC_CONST_INIT_BUG)
  ;
  static const bool
# else
  ,
# endif
  is_specialized = true,
  is_signed = (__imin != 0),
  is_integer = true,
  is_exact = true,
  is_bounded = true,
  is_modulo = __ismod
# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  }
# endif
  ;
};

// Base class for floating-point numbers.
template <class __number,
         int __Digits, int __Digits10,
         int __MinExp, int __MaxExp,
         int __MinExp10, int __MaxExp10,
         bool __IsIEC559,
         float_round_style __RoundStyle>
class _Floating_limits : public _Numeric_limits_base<__number>
{
public:

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  enum {
# else
  static const int 
# endif  

  digits = __Digits,
  digits10 = __Digits10,

  radix = (  FLT_RADIX /* 2 */ ),
  min_exponent = __MinExp, 
  max_exponent = __MaxExp,
  min_exponent10 = __MinExp10,
  max_exponent10 = __MaxExp10

# if defined (_STLP_STATIC_CONST_INIT_BUG)
  ,  
  has_denorm = denorm_indeterminate,
  round_style = __RoundStyle,
# else
  ;
  static const float_denorm_style has_denorm = denorm_indeterminate;
  static const float_round_style round_style = __RoundStyle;
  static const bool 
# endif

  is_specialized = true,
  is_signed = true, 
  has_infinity     =  true,
  has_quiet_NaN    =  true,
  has_signaling_NaN=  true,
  has_denorm_loss  =  false,
  is_iec559      =  __IsIEC559,
  is_bounded     =  true,
  traps          =  true,
  tinyness_before=  false

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  }
# endif
  ;

};

// Class numeric_limits

// The unspecialized class.

template<class _Tp> 
class numeric_limits : public _Numeric_limits_base<_Tp> {};

// Specializations for all built-in integral types.

#ifndef _STLP_NO_BOOL

_STLP_TEMPLATE_NULL
class   numeric_limits<bool>
  : public _Integer_limits<bool, false, true, 1, false>
{};

#endif /* _STLP_NO_BOOL */

_STLP_TEMPLATE_NULL
class   numeric_limits<char>
  : public _Integer_limits<char, CHAR_MIN, CHAR_MAX, -1, true>
{};

# ifndef _STLP_NO_SIGNED_BUILTINS
_STLP_TEMPLATE_NULL
class   numeric_limits<signed char>
  : public _Integer_limits<signed char, SCHAR_MIN, SCHAR_MAX, -1, true>
{};
# endif

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned char>
  : public _Integer_limits<unsigned char, 0, UCHAR_MAX, -1, true>
{};

#if !(defined ( _STLP_NO_WCHAR_T ) || defined (_STLP_WCHAR_T_IS_USHORT))

_STLP_TEMPLATE_NULL
class   numeric_limits<wchar_t>
  : public _Integer_limits<wchar_t, WCHAR_MIN, WCHAR_MAX, -1, true>
{};

#endif

_STLP_TEMPLATE_NULL
class   numeric_limits<short>
  : public _Integer_limits<short, SHRT_MIN, SHRT_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned short>
  : public _Integer_limits<unsigned short, 0, USHRT_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<int>
  : public _Integer_limits<int, INT_MIN, INT_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned int>
  : public _Integer_limits<unsigned int, 0, UINT_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<long>
  : public _Integer_limits<long, LONG_MIN, LONG_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned long>
  : public _Integer_limits<unsigned long, 0, ULONG_MAX, -1, true>
{};

#ifdef _STLP_LONG_LONG

# if defined (_STLP_MSVC) || defined (__BORLANDC__)

#    define LONGLONG_MAX     0x7fffffffffffffffi64
#    define LONGLONG_MIN     (-LONGLONG_MAX-1i64)
#    define ULONGLONG_MAX    0xffffffffffffffffUi64

# else

#  ifndef   LONGLONG_MAX
#    define LONGLONG_MAX     0x7fffffffffffffffLL
#  endif
#  ifndef   LONGLONG_MIN
#    define LONGLONG_MIN     (-LONGLONG_MAX-1LL)
#  endif
#  ifndef   ULONGLONG_MAX
#    define ULONGLONG_MAX    0xffffffffffffffffULL
#  endif

# endif

#if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ <= 96)

_STLP_TEMPLATE_NULL
class   numeric_limits<_STLP_LONG_LONG>
  : public _Integer_limits<_STLP_LONG_LONG, LONGLONG_MIN, LONGLONG_MAX, -1, true>
{};

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned _STLP_LONG_LONG>
  : public _Integer_limits<unsigned _STLP_LONG_LONG, 0, ULONGLONG_MAX, -1, true>
{};
#else /* gcc 2.97 (after 2000-11-01), 2.98, 3.0 */
/*
 newest gcc has new mangling scheme, that has problem
 with generating name [instantiated] of template specialization like
 _Integer_limits<_STLP_LONG_LONG, LONGLONG_MIN, LONGLONG_MAX, -1, true>
                                  ~~~~~~~~~~~~  ~~~~~~~~~~~~
 Below is code that solve this problem.
   - ptr
 */
_STLP_TEMPLATE_NULL
class   numeric_limits<_STLP_LONG_LONG>
  : public _Numeric_limits_base<_STLP_LONG_LONG> 
{
public:

  static _STLP_LONG_LONG (_STLP_CALL min) () _STLP_NOTHROW { return LONGLONG_MIN; }
  static _STLP_LONG_LONG (_STLP_CALL max) () _STLP_NOTHROW { return LONGLONG_MAX; }

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  enum {
# else
  static const int 
# endif  
  digits = ((int)((sizeof(_STLP_LONG_LONG) * (CHAR_BIT))) - 1),
  digits10 = (digits * 301UL) / 1000,
  radix = 2
# if ! defined ( _STLP_STATIC_CONST_INIT_BUG)
  ;
  static const bool
# else
  ,
# endif
  is_specialized = true,
  is_signed = true,
  is_integer = true,
  is_exact = true,
  is_bounded = true,
  is_modulo = true
# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  }
# endif
  ;
};

_STLP_TEMPLATE_NULL
class   numeric_limits<unsigned _STLP_LONG_LONG>
  : public _Numeric_limits_base<unsigned _STLP_LONG_LONG> 
{
public:

  static unsigned _STLP_LONG_LONG (_STLP_CALL min) () _STLP_NOTHROW { return 0ULL; }
  static unsigned _STLP_LONG_LONG (_STLP_CALL max) () _STLP_NOTHROW { return ULONGLONG_MAX; }

# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  enum {
# else
  static const int 
# endif  
  digits = ((int)((sizeof(unsigned _STLP_LONG_LONG) * (CHAR_BIT)))),
  digits10 = (digits * 301UL) / 1000,
  radix = 2
# if ! defined ( _STLP_STATIC_CONST_INIT_BUG)
  ;
  static const bool
# else
  ,
# endif
  is_specialized = true,
  is_signed = false,
  is_integer = true,
  is_exact = true,
  is_bounded = true,
  is_modulo = true
# if defined ( _STLP_STATIC_CONST_INIT_BUG)
  }
# endif
  ;
};

# endif /* __GNUC__ > 2000-11-01 */

#endif /* _STLP_LONG_LONG */

// Specializations for all built-in floating-point types.

union _F_rep
{
  unsigned short rep[2];
  float val;
};
union _D_rep
{
  unsigned short rep[4];
  double val;
};

# ifndef _STLP_NO_LONG_DOUBLE
union _L_rep
{
  unsigned short rep[8];
  long double val;
};
# endif

template <class __dummy>
class _LimG 
{
public:  
  static const _F_rep _F_inf;
  static const _F_rep _F_qNaN;
  static const _F_rep _F_sNaN;
  static const _D_rep _D_inf;
  static const _D_rep _D_qNaN;
  static const _D_rep _D_sNaN;
  
# ifndef _STLP_NO_LONG_DOUBLE
  static const _L_rep _L_inf;
  static const _L_rep _L_qNaN;
  static const _L_rep _L_sNaN;
# endif
};

# if defined (_STLP_USE_TEMPLATE_EXPORT) 
_STLP_EXPORT_TEMPLATE_CLASS _LimG<bool>;
# endif

_STLP_TEMPLATE_NULL class   numeric_limits<float>
  : public _Floating_limits<float, 
                            FLT_MANT_DIG,   // Binary digits of precision
                            FLT_DIG,        // Decimal digits of precision
                            FLT_MIN_EXP,    // Minimum exponent
                            FLT_MAX_EXP,    // Maximum exponent
                            FLT_MIN_10_EXP, // Minimum base 10 exponent
                            FLT_MAX_10_EXP, // Maximum base 10 exponent
                            true,           // conforms to iec559
                            round_to_nearest>
{
public:
  static float (_STLP_CALL min) () _STLP_NOTHROW { return FLT_MIN; }
  static float _STLP_CALL denorm_min() _STLP_NOTHROW { return FLT_MIN; }
  static float (_STLP_CALL max) () _STLP_NOTHROW { _STLP_USING_VENDOR_CSTD return FLT_MAX; }
  static float _STLP_CALL epsilon() _STLP_NOTHROW { return FLT_EPSILON; }
  static float _STLP_CALL round_error() _STLP_NOTHROW { return 0.5f; } // Units: ulps.
  static  float _STLP_CALL infinity() { return _LimG<bool>::_F_inf.val; }
  static  float _STLP_CALL quiet_NaN() { return _LimG<bool>::_F_qNaN.val; }
  static  float _STLP_CALL signaling_NaN() { return _LimG<bool>::_F_sNaN.val; }
};

_STLP_TEMPLATE_NULL class   numeric_limits<double>
  : public _Floating_limits<double, 
                            DBL_MANT_DIG,   // Binary digits of precision
                            DBL_DIG,        // Decimal digits of precision
                            DBL_MIN_EXP,    // Minimum exponent
                            DBL_MAX_EXP,    // Maximum exponent
                            DBL_MIN_10_EXP, // Minimum base 10 exponent
                            DBL_MAX_10_EXP, // Maximum base 10 exponent
                            true,           // conforms to iec559
                            round_to_nearest>
{
public:
  static double (_STLP_CALL min)() _STLP_NOTHROW { return DBL_MIN; }
  static double _STLP_CALL denorm_min() _STLP_NOTHROW { return DBL_MIN; }
  static double (_STLP_CALL max)() _STLP_NOTHROW { _STLP_USING_VENDOR_CSTD return DBL_MAX; }
  static double _STLP_CALL epsilon() _STLP_NOTHROW { return DBL_EPSILON; }
  static double _STLP_CALL round_error() _STLP_NOTHROW { return 0.5; } // Units: ulps.
  static  double _STLP_CALL infinity() { return _LimG<bool>::_D_inf.val; }
  static  double _STLP_CALL quiet_NaN(){ return _LimG<bool>::_D_qNaN.val; }
  static  double _STLP_CALL signaling_NaN() { return _LimG<bool>::_D_sNaN.val; }
};

# ifndef _STLP_NO_LONG_DOUBLE

_STLP_TEMPLATE_NULL 
class   numeric_limits<long double>
  : public _Floating_limits<long double, 
                            LDBL_MANT_DIG,  // Binary digits of precision
                            LDBL_DIG,       // Decimal digits of precision
                            LDBL_MIN_EXP,   // Minimum exponent
                            LDBL_MAX_EXP,   // Maximum exponent
                            LDBL_MIN_10_EXP,// Minimum base 10 exponent
                            LDBL_MAX_10_EXP,// Maximum base 10 exponent
                            false,          // Doesn't conform to iec559
                            round_to_nearest>
{
public:
  static long double (_STLP_CALL min) () _STLP_NOTHROW { _STLP_USING_VENDOR_CSTD return LDBL_MIN; }
  static long double _STLP_CALL denorm_min() _STLP_NOTHROW { _STLP_USING_VENDOR_CSTD return LDBL_MIN; }
  static long double (_STLP_CALL max) () _STLP_NOTHROW { _STLP_USING_VENDOR_CSTD return LDBL_MAX; }
  static long double _STLP_CALL epsilon() _STLP_NOTHROW { return LDBL_EPSILON; }
  static long double _STLP_CALL round_error() _STLP_NOTHROW { return 4; } // Units: ulps.
  static long double _STLP_CALL infinity() { return _LimG<bool>::_L_inf.val; } 
  static long double _STLP_CALL quiet_NaN() { return _LimG<bool>::_L_qNaN.val; }
  static long double _STLP_CALL signaling_NaN() { return _LimG<bool>::_L_sNaN.val; }
};

# endif

// We write special values (Inf and NaN) as bit patterns and 
// cast the the appropriate floating-point types. 
_STLP_END_NAMESPACE

# if !defined (_STLP_LINK_TIME_INSTANTIATION)
#  include <stl/_limits.c>
# endif

#endif

// Local Variables:
// mode:C++
// End:

---