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BAN: Add {max,min}_exponent{2,10} to numeric_limits<T>

This commit is contained in:
Bananymous 2024-02-16 15:27:40 +02:00
parent 1b24c4f279
commit fb0d8d746f
1 changed files with 122 additions and 37 deletions
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159
BAN/include/BAN/Limits.h
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@ -13,59 +13,144 @@ namespace BAN
public: public:
numeric_limits() = delete; numeric_limits() = delete;
static constexpr T max() requires(is_signed_v<T> && is_integral_v<T>) static inline constexpr T max()
{ {
if constexpr(sizeof(T) == sizeof(int8_t)) if constexpr(is_same_v<T, char>)
return __INT8_MAX__; return __SCHAR_MAX__;
if constexpr(sizeof(T) == sizeof(int16_t)) if constexpr(is_same_v<T, signed char>)
return __INT16_MAX__; return __SCHAR_MAX__;
if constexpr(sizeof(T) == sizeof(int32_t)) if constexpr(is_same_v<T, unsigned char>)
return __INT32_MAX__; return (T)__SCHAR_MAX__ * 2 + 1;
if constexpr(sizeof(T) == sizeof(int64_t))
return __INT64_MAX__;
}
static constexpr T max() requires(is_unsigned_v<T> && is_integral_v<T>) if constexpr(is_same_v<T, short>)
{ return __SHRT_MAX__;
if constexpr(sizeof(T) == sizeof(uint8_t)) if constexpr(is_same_v<T, int>)
return __UINT8_MAX__; return __INT_MAX__;
if constexpr(sizeof(T) == sizeof(uint16_t)) if constexpr(is_same_v<T, long>)
return __UINT16_MAX__; return __LONG_MAX__;
if constexpr(sizeof(T) == sizeof(uint32_t)) if constexpr(is_same_v<T, long long>)
return __UINT32_MAX__; return __LONG_LONG_MAX__;
if constexpr(sizeof(T) == sizeof(uint64_t))
return __UINT64_MAX__;
}
static constexpr T max() requires(is_floating_point_v<T>) if constexpr(is_same_v<T, unsigned short>)
{ return (T)__SHRT_MAX__ * 2 + 1;
if constexpr(sizeof(T) == sizeof(float)) if constexpr(is_same_v<T, unsigned int>)
return (T)__INT_MAX__ * 2 + 1;
if constexpr(is_same_v<T, unsigned long>)
return (T)__LONG_MAX__ * 2 + 1;
if constexpr(is_same_v<T, unsigned long long>)
return (T)__LONG_LONG_MAX__ * 2 + 1;
if constexpr(is_same_v<T, float>)
return __FLT_MAX__; return __FLT_MAX__;
if constexpr(sizeof(T) == sizeof(double)) if constexpr(is_same_v<T, double>)
return __DBL_MAX__; return __DBL_MAX__;
if constexpr(sizeof(T) == sizeof(long double)) if constexpr(is_same_v<T, long double>)
return __LDBL_MAX__; return __LDBL_MAX__;
} }
static constexpr T infinity() requires(is_floating_point_v<T>) static inline constexpr T min()
{ {
if constexpr(sizeof(T) == sizeof(float)) if constexpr(is_signed_v<T> && is_integral_v<T>)
return __FLT_MAX__; return -max() - 1;
if constexpr(sizeof(T) == sizeof(double))
return __DBL_MAX__; if constexpr(is_unsigned_v<T> && is_integral_v<T>)
if constexpr(sizeof(T) == sizeof(long double)) return 0;
return __LDBL_MAX__;
if constexpr(is_same_v<T, float>)
return __FLT_MIN__;
if constexpr(is_same_v<T, double>)
return __DBL_MIN__;
if constexpr(is_same_v<T, long double>)
return __LDBL_MIN__;
} }
static constexpr T nan() requires(is_floating_point_v<T>) static inline constexpr bool has_infinity()
{ {
if constexpr(sizeof(T) == sizeof(float)) if constexpr(is_same_v<T, float>)
return __FLT_HAS_INFINITY__;
if constexpr(is_same_v<T, double>)
return __DBL_HAS_INFINITY__;
if constexpr(is_same_v<T, long double>)
return __LDBL_HAS_INFINITY__;
return false;
}
static inline constexpr T infinity() requires(has_infinity())
{
if constexpr(is_same_v<T, float>)
return __builtin_inff();
if constexpr(is_same_v<T, double>)
return __builtin_inf();
if constexpr(is_same_v<T, long double>)
return __builtin_infl();
}
static inline constexpr bool has_quiet_NaN()
{
if constexpr(is_same_v<T, float>)
return __FLT_HAS_QUIET_NAN__;
if constexpr(is_same_v<T, double>)
return __DBL_HAS_QUIET_NAN__;
if constexpr(is_same_v<T, long double>)
return __LDBL_HAS_QUIET_NAN__;
return false;
}
static inline constexpr T quiet_NaN() requires(has_quiet_NaN())
{
if constexpr(is_same_v<T, float>)
return __builtin_nanf(""); return __builtin_nanf("");
if constexpr(sizeof(T) == sizeof(double)) if constexpr(is_same_v<T, double>)
return __builtin_nan(""); return __builtin_nan("");
if constexpr(sizeof(T) == sizeof(long double)) if constexpr(is_same_v<T, long double>)
return __builtin_nanl(""); return __builtin_nanl("");
} }
static inline constexpr int max_exponent2()
{
static_assert(__FLT_RADIX__ == 2);
if constexpr(is_same_v<T, float>)
return __FLT_MAX_EXP__;
if constexpr(is_same_v<T, double>)
return __DBL_MAX_EXP__;
if constexpr(is_same_v<T, long double>)
return __LDBL_MAX_EXP__;
return 0;
}
static inline constexpr int max_exponent10()
{
if constexpr(is_same_v<T, float>)
return __FLT_MAX_10_EXP__;
if constexpr(is_same_v<T, double>)
return __DBL_MAX_10_EXP__;
if constexpr(is_same_v<T, long double>)
return __LDBL_MAX_10_EXP__;
return 0;
}
static inline constexpr int min_exponent2()
{
static_assert(__FLT_RADIX__ == 2);
if constexpr(is_same_v<T, float>)
return __FLT_MIN_EXP__;
if constexpr(is_same_v<T, double>)
return __DBL_MIN_EXP__;
if constexpr(is_same_v<T, long double>)
return __LDBL_MIN_EXP__;
return 0;
}
static inline constexpr int min_exponent10()
{
if constexpr(is_same_v<T, float>)
return __FLT_MIN_10_EXP__;
if constexpr(is_same_v<T, double>)
return __DBL_MIN_10_EXP__;
if constexpr(is_same_v<T, long double>)
return __LDBL_MIN_10_EXP__;
return 0;
}
}; };
} }