std::numeric_limits<T>::radix
From cppreference.com
static const int radix;
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(until C++11) | |
static constexpr int radix;
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(since C++11) | |
The value of std::numeric_limits<T>::radix is the base of the number system used in the representation of the type. It is 2 for all binary numeric types, but it may be, for example, 10 for IEEE 754 decimal floating-point types or for third-party binary-coded decimal integers. This constant is meaningful for all specializations.
Standard specializations
T
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value of std::numeric_limits<T>::radix
|
/* non-specialized */
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0
|
bool
|
2
|
char
|
2
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signed char
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2
|
unsigned char
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2
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wchar_t
|
2
|
char8_t (since C++20)
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2
|
char16_t (since C++11)
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2
|
char32_t (since C++11)
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2
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short
|
2
|
unsigned short
|
2
|
int
|
2
|
unsigned int
|
2
|
long
|
2
|
unsigned long
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2
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long long (since C++11)
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2
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unsigned long long (since C++11)
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2
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float
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FLT_RADIX |
double
|
FLT_RADIX |
long double
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FLT_RADIX |
Example
Run this code
#include <cfloat>
#include <limits>
#include <ratio>
template <int Radix, typename... Types>
constexpr bool radix = ((std::numeric_limits<Types>::radix == Radix) and ...);
static_assert
(
radix <0, std::exa> and
radix <2,
bool, char, signed char, unsigned char, wchar_t, char8_t, char16_t, char32_t,
short, unsigned short, int, unsigned int, long, unsigned long, long long,
unsigned long long> and
radix <FLT_RADIX, float, double, long double>
);
int main() {}
See also
[static] |
number of radix digits that can be represented without change (public static member constant) |
[static] |
one more than the smallest negative power of the radix that is a valid normalized floating-point value (public static member constant) |
[static] |
one more than the largest integer power of the radix that is a valid finite floating-point value (public static member constant) |