std::log2p1
From cppreference.com
Defined in header <bit>


template< class T > constexpr T log2p1(T x) noexcept; 
(since C++20)  
If x
is not zero, calculates the number of bits needed to store the value x
, that is, 1 + floor(log
2(x)). If x
is zero, returns zero.
This overload only participates in overload resolution if T
is an unsigned integer type (that is, unsigned char, unsigned short, unsigned int, unsigned long, unsigned long long, or an extended unsigned integer type).
Return value
Zero if x
is zero; otherwise, one plus the base2 logarithm of x
, with any fractional part discarded.
Example
This section is incomplete Reason: no example 