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AK: Add NumericLimits::digits to return the number of digits in a type

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Analogous to std::numeric_limits<T>::digits.
This commit is contained in:
Timothy Flynn 2023-03-28 09:07:03 -04:00 committed by Andreas Kling
parent a944eed013
commit 9423662107
1 changed files with 15 additions and 0 deletions
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15
AK/NumericLimits.h
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@ -19,6 +19,7 @@ struct NumericLimits<bool> {
static constexpr bool min() { return false; }
static constexpr bool max() { return true; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return 1; }
};
template<>
@ -26,6 +27,7 @@ struct NumericLimits<signed char> {
static constexpr signed char min() { return -__SCHAR_MAX__ - 1; }
static constexpr signed char max() { return __SCHAR_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ - 1; }
};
template<>
@ -33,6 +35,7 @@ struct NumericLimits<char> {
static constexpr char min() { return -__SCHAR_MAX__ - 1; }
static constexpr char max() { return __SCHAR_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ - 1; }
};
template<>
@ -40,6 +43,7 @@ struct NumericLimits<short> {
static constexpr short min() { return -__SHRT_MAX__ - 1; }
static constexpr short max() { return __SHRT_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(short) - 1; }
};
template<>
@ -47,6 +51,7 @@ struct NumericLimits<int> {
static constexpr int min() { return -__INT_MAX__ - 1; }
static constexpr int max() { return __INT_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(int) - 1; }
};
template<>
@ -54,6 +59,7 @@ struct NumericLimits<long> {
static constexpr long min() { return -__LONG_MAX__ - 1; }
static constexpr long max() { return __LONG_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(long) - 1; }
};
template<>
@ -61,6 +67,7 @@ struct NumericLimits<long long> {
static constexpr long long min() { return -__LONG_LONG_MAX__ - 1; }
static constexpr long long max() { return __LONG_LONG_MAX__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(long long) - 1; }
};
template<>
@ -68,6 +75,7 @@ struct NumericLimits<unsigned char> {
static constexpr unsigned char min() { return 0; }
static constexpr unsigned char max() { return __SCHAR_MAX__ * 2u + 1; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return __CHAR_BIT__; }
};
template<>
@ -75,6 +83,7 @@ struct NumericLimits<unsigned short> {
static constexpr unsigned short min() { return 0; }
static constexpr unsigned short max() { return __SHRT_MAX__ * 2u + 1; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(short); }
};
template<>
@ -82,6 +91,7 @@ struct NumericLimits<unsigned> {
static constexpr unsigned min() { return 0; }
static constexpr unsigned max() { return __INT_MAX__ * 2u + 1; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(int); }
};
template<>
@ -89,6 +99,7 @@ struct NumericLimits<unsigned long> {
static constexpr unsigned long min() { return 0; }
static constexpr unsigned long max() { return __LONG_MAX__ * 2ul + 1; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(long); }
};
template<>
@ -96,6 +107,7 @@ struct NumericLimits<unsigned long long> {
static constexpr unsigned long long min() { return 0; }
static constexpr unsigned long long max() { return __LONG_LONG_MAX__ * 2ull + 1; }
static constexpr bool is_signed() { return false; }
static constexpr size_t digits() { return __CHAR_BIT__ * sizeof(long long); }
};
#ifndef KERNEL
@ -106,6 +118,7 @@ struct NumericLimits<float> {
static constexpr float max() { return __FLT_MAX__; }
static constexpr float epsilon() { return __FLT_EPSILON__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __FLT_MANT_DIG__; }
};
template<>
@ -115,6 +128,7 @@ struct NumericLimits<double> {
static constexpr double max() { return __DBL_MAX__; }
static constexpr double epsilon() { return __DBL_EPSILON__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __DBL_MANT_DIG__; }
};
template<>
@ -124,6 +138,7 @@ struct NumericLimits<long double> {
static constexpr long double max() { return __LDBL_MAX__; }
static constexpr long double epsilon() { return __LDBL_EPSILON__; }
static constexpr bool is_signed() { return true; }
static constexpr size_t digits() { return __LDBL_MANT_DIG__; }
};
#endif