limits.hpp

system C源码 一种替代verilog的语言

  BOOST_STL_DECLARE_LIMITS_MEMBER(float_denorm_style,
                              has_denorm,
                              denorm_indeterminate);
  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_denorm_loss,   false);

 
  static __number infinity() throw() {
    return float_helper<__number, __InfinityWord>::get_word();
  }
  static __number quiet_NaN() throw() {
    return float_helper<__number,__QNaNWord>::get_word();
  }
  static __number signaling_NaN() throw() {
    return float_helper<__number,__SNaNWord>::get_word();
  }

  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_iec559,       __IsIEC559);
  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_bounded,      true);
  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, traps,           false /* was: true */ );
  BOOST_STL_DECLARE_LIMITS_MEMBER(bool, tinyness_before, false);

  BOOST_STL_DECLARE_LIMITS_MEMBER(float_round_style, round_style, __RoundStyle);
};

// Class numeric_limits

// The unspecialized class.

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

// Specializations for all built-in integral types.

template<>
class numeric_limits<bool>
  : public _Integer_limits<bool, false, true, 0>
{};

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

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

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

#ifndef BOOST_NO_INTRINSIC_WCHAR_T
template<>
class numeric_limits<wchar_t>
#if !defined(WCHAR_MAX) || !defined(WCHAR_MIN)
#if defined(_WIN32) || defined(__CYGWIN__)
  : public _Integer_limits<wchar_t, 0, USHRT_MAX>
#elif defined(__hppa)
// wchar_t has "unsigned int" as the underlying type
  : public _Integer_limits<wchar_t, 0, UINT_MAX>
#else
// assume that wchar_t has "int" as the underlying type
  : public _Integer_limits<wchar_t, INT_MIN, INT_MAX>
#endif
#else
// we have WCHAR_MIN and WCHAR_MAX defined, so use it
  : public _Integer_limits<wchar_t, WCHAR_MIN, WCHAR_MAX>
#endif
{};
#endif

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

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

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

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

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

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

#ifdef __GNUC__

// 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_MAX) && !defined(ULONGLONG_MAX)

# define ULONGLONG_MAX 0xffffffffffffffffLLU
# define LONGLONG_MAX 0x7fffffffffffffffLL

#endif

#if !defined(LONGLONG_MIN)
# define LONGLONG_MIN (-LONGLONG_MAX - 1)
#endif 


#if !defined(ULONGLONG_MIN)
# define ULONGLONG_MIN 0
#endif 

#endif /* __GNUC__ */

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

template<> 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
#if defined(BOOST_BIG_ENDIAN)
                            0x7f80 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
                            0x7f81 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
                            0x7fc1 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
#else
                            0x7f800000u,    // Last word of +infinity
                            0x7f810000u,    // Last word of quiet NaN
                            0x7fc10000u,    // Last word of signaling NaN
#endif
                            true,           // conforms to iec559
                            round_to_nearest>
{
public:
  static float min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return FLT_MIN; }
  static float denorm_min() throw() { return FLT_MIN; }
  static float max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return FLT_MAX; }
  static float epsilon() throw() { return FLT_EPSILON; }
  static float round_error() throw() { return 0.5f; } // Units: ulps.
};

template<> 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
#if defined(BOOST_BIG_ENDIAN)
                            0x7ff0 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
                            0x7ff1 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
                            0x7ff9 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
#else
                            0x7ff00000u,    // Last word of +infinity
                            0x7ff10000u,    // Last word of quiet NaN
                            0x7ff90000u,    // Last word of signaling NaN
#endif
                            true,           // conforms to iec559
                            round_to_nearest>
{
public:
  static double min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return DBL_MIN; }
  static double denorm_min() throw() { return DBL_MIN; }
  static double max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return DBL_MAX; }
  static double epsilon() throw() { return DBL_EPSILON; }
  static double round_error() throw() { return 0.5; } // Units: ulps.
};

template<> 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
#if defined(BOOST_BIG_ENDIAN)
                            0x7ff0 << (sizeof(int)*CHAR_BIT-16),    // Last word of +infinity
                            0x7ff1 << (sizeof(int)*CHAR_BIT-16),    // Last word of quiet NaN
                            0x7ff9 << (sizeof(int)*CHAR_BIT-16),    // Last word of signaling NaN
#else
                            0x7fff8000u,    // Last word of +infinity
                            0x7fffc000u,    // Last word of quiet NaN
                            0x7fff9000u,    // Last word of signaling NaN
#endif
                            false,          // Doesn't conform to iec559
                            round_to_nearest>
{
public:
  static long double min BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return LDBL_MIN; }
  static long double denorm_min() throw() { return LDBL_MIN; }
  static long double max BOOST_PREVENT_MACRO_SUBSTITUTION () throw() { return LDBL_MAX; }
  static long double epsilon() throw() { return LDBL_EPSILON; }
  static long double round_error() throw() { return 4; } // Units: ulps.
};

} // namespace std

#endif /* BOOST_SGI_CPP_LIMITS */

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