limits

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#undef __STL_DEFINE_INTEGER_LIMITS_MEMBER
#undef __STL_DEFINE_FLOAT_LIMITS_MEMBER

// 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 __STL_NO_BOOL

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

#endif /* __STL_NO_BOOL */

__STL_TEMPLATE_NULL
class numeric_limits<char>
  : public _Integer_limits<char, CHAR_MIN, CHAR_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<signed char>
  : public _Integer_limits<signed char, SCHAR_MIN, SCHAR_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<unsigned char>
  : public _Integer_limits<unsigned char, 0, UCHAR_MAX>
{};

#ifdef __STL_HAS_WCHAR_T

__STL_TEMPLATE_NULL
class numeric_limits<wchar_t>
  : public _Integer_limits<wchar_t, INT_MIN, INT_MAX>
{};

#endif

__STL_TEMPLATE_NULL
class numeric_limits<short>
  : public _Integer_limits<short, SHRT_MIN, SHRT_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<unsigned short>
  : public _Integer_limits<unsigned short, 0, USHRT_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<int>
  : public _Integer_limits<int, INT_MIN, INT_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<unsigned int>
  : public _Integer_limits<unsigned int, 0, UINT_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<long>
  : public _Integer_limits<long, LONG_MIN, LONG_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<unsigned long>
  : public _Integer_limits<unsigned long, 0, ULONG_MAX>
{};

#ifdef __STL_LONG_LONG

// Some compilers have long long, but don't define the
// LONGLONG_MIN and LONGLONG_MAX macros in limits.h.  This
// assumes that long long is 64 bits.
#if !defined(LONGLONG_MIN) && !defined(LONGLONG_MAX) \
                           && !defined(ULONGLONG_MAX)

#define ULONGLONG_MAX 0xffffffffffffffffLLU
#define LONGLONG_MAX 0x7fffffffffffffffLL
#define LONGLONG_MIN (-LONGLONG_MAX - 1LL)

#endif

__STL_TEMPLATE_NULL
class numeric_limits<long long>
  : public _Integer_limits<long long, LONGLONG_MIN, LONGLONG_MAX>
{};

__STL_TEMPLATE_NULL
class numeric_limits<unsigned long long>
  : public _Integer_limits<unsigned long long, 0, ULONGLONG_MAX>
{};

#endif /* __STL_LONG_LONG */

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

__STL_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 min() __STL_NOTHROW { return FLT_MIN; }
  static float denorm_min() __STL_NOTHROW { return FLT_MIN; }
  static float max() __STL_NOTHROW { return FLT_MAX; }
  static float epsilon() __STL_NOTHROW { return FLT_EPSILON; }
  static float round_error() __STL_NOTHROW { return 0.5f; } // Units: ulps.
  static float infinity() __STL_NOTHROW;
  static float quiet_NaN() __STL_NOTHROW;
  static float signaling_NaN() __STL_NOTHROW;
};

__STL_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 min() __STL_NOTHROW { return DBL_MIN; }
  static double denorm_min() __STL_NOTHROW { return DBL_MIN; }
  static double max() __STL_NOTHROW { return DBL_MAX; }
  static double epsilon() __STL_NOTHROW { return DBL_EPSILON; }
  static double round_error() __STL_NOTHROW { return 0.5; } // Units: ulps.
  static double infinity() __STL_NOTHROW;
  static double quiet_NaN() __STL_NOTHROW;
  static double signaling_NaN() __STL_NOTHROW;
};

__STL_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 min() __STL_NOTHROW { return LDBL_MIN; }
  static long double denorm_min() __STL_NOTHROW { return LDBL_MIN; }
  static long double max() __STL_NOTHROW { return LDBL_MAX; }
  static long double epsilon() __STL_NOTHROW { return LDBL_EPSILON; }
  static long double round_error() __STL_NOTHROW { return 4; } // Units: ulps.
  static long double infinity() __STL_NOTHROW;
  static long double quiet_NaN() __STL_NOTHROW;
  static long double signaling_NaN() __STL_NOTHROW;
};

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

#if defined(_MIPSEB)
// Big-endian MIPS.  float is 32 bits, double 64, long double 128.

#define _Define_float(__f, __h, __l)                                     \
   inline float numeric_limits<float>::__f() __STL_NOTHROW {             \
     static const unsigned short __x[2] = { __h, __l };                  \
     return *reinterpret_cast<const float*>(__x); }
#define _Define_double(__f, __h, __l)                                    \
   inline double numeric_limits<double>::__f() __STL_NOTHROW {           \
     static const unsigned short __x[4] = { __h, __l };                  \
     return *reinterpret_cast<const double*>(__x); }
#define _Define_ldouble(__f, __h, __l)                                   \
   inline long double numeric_limits<long double>::__f() __STL_NOTHROW { \
     static const unsigned short __x[8] = { __h, __l };                  \
     return *reinterpret_cast<const long double*>(__x); }

_Define_float(infinity, 0x7f80, 0)
_Define_float(quiet_NaN, 0x7f81, 0)
_Define_float(signaling_NaN, 0x7fc1, 0)

_Define_double(infinity, 0x7ff0, 0)
_Define_double(quiet_NaN, 0x7ff1, 0)
_Define_double(signaling_NaN, 0x7ff9, 0)

_Define_ldouble(infinity, 0x7ff0, 0)
_Define_ldouble(quiet_NaN, 0x7ff1, 0)
_Define_ldouble(signaling_NaN, 0x7ff9, 0)

#elif defined(__i386) || defined(_M_IX86)
// Little-endian ia32.  float is 32 bits, double 64, long double 80.

#define _Define_float(__f, __h, __l)                                     \
   inline float numeric_limits<float>::__f() __STL_NOTHROW {             \
     static const unsigned short __x[2] = { __l, __h };                  \
     return *reinterpret_cast<const float*>(__x); }
#define _Define_double(__f, __h, __l)                                    \
   inline double numeric_limits<double>::__f() __STL_NOTHROW {           \
     static const unsigned short __x[4] = { 0, 0, __l, __h };            \
     return *reinterpret_cast<const double*>(__x); }
#define _Define_ldouble(__f, __h, __l)                                   \
   inline long double numeric_limits<long double>::__f() __STL_NOTHROW { \
     static const unsigned short __x[5] = { 0, 0, 0, __l, __h };         \
     return *reinterpret_cast<const long double*>(__x); }

_Define_float(infinity, 0x7f80, 0)
_Define_float(quiet_NaN, 0x7fa0, 0)
_Define_float(signaling_NaN, 0x7fc0, 0)

_Define_double(infinity, 0x7ff0, 0)
_Define_double(quiet_NaN, 0x7ff4, 0)
_Define_double(signaling_NaN, 0x7ff8, 0)

_Define_ldouble(infinity, 0x7fff, 0x8000)
_Define_ldouble(quiet_NaN, 0x7fff, 0xa000)
_Define_ldouble(signaling_NaN, 0x7fff, 0xc000)

#else 

/* This is an architecture we don't know how to handle.  Return some 
   obviously wrong values. */

#define _Define_float(__f)                                               \
   inline float numeric_limits<float>::__f() __STL_NOTHROW {             \
     return 0; }
#define _Define_double(__f)                                              \
   inline double numeric_limits<double>::__f() __STL_NOTHROW {           \
     return 0; }
#define _Define_ldouble(__f)                                             \
   inline long double numeric_limits<long double>::__f() __STL_NOTHROW { \
     return 0; }

_Define_float(infinity)
_Define_float(quiet_NaN)
_Define_float(signaling_NaN)

_Define_double(infinity)
_Define_double(quiet_NaN)
_Define_double(signaling_NaN)

_Define_ldouble(infinity)
_Define_ldouble(quiet_NaN)
_Define_ldouble(signaling_NaN)   

#endif

#undef _Define_float
#undef _Define_double
#undef _Define_ldouble

__STL_END_NAMESPACE

#endif /* __SGI_CPP_LIMITS */

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