std::ilogb, std::ilogbf, std::ilogbl
From cppreference.com
| Defined in header <cmath>
|
||
| (1) | ||
int ilogb ( float num ); int ilogb ( double num ); |
(since C++11) (until C++23) |
|
| constexpr int ilogb( /* floating-point-type */ num ); |
(since C++23) | |
| int ilogbf( float num ); |
(2) | (since C++11) (constexpr since C++23) |
| int ilogbl( long double num ); |
(3) | (since C++11) (constexpr since C++23) |
| #define FP_ILOGB0 /* implementation-defined */ |
(4) | (since C++11) |
| #define FP_ILOGBNAN /* implementation-defined */ |
(5) | (since C++11) |
| Defined in header <cmath>
|
||
| template< class Integer > int ilogb ( Integer num ); |
(A) | (since C++11) (constexpr since C++23) |
1-3) Extracts the value of the unbiased exponent from the floating-point argument num, and returns it as a signed integer value. The library provides overloads of
std::ilogb for all cv-unqualified floating-point types as the type of the parameter num.(since C++23)A) Additional overloads are provided for all integer types, which are treated as double.
Formally, the unbiased exponent is the integral part of logr|num| as a signed integral value, for non-zero num, where r is std::numeric_limits<T>::radix and T is the floating-point type of num.
Contents |