template <size_t B, class D>
constexpr size_t popcount(const basic_integer<B, D, false>& value) noexcept;constexpr since C++14
Calculates count of 1-bits in integer.
Example
#include "fwnbi.hpp"
#include <iostream>
using namespace fwnbi::literals;
int main() {
std::cout << fwnbi::popcount(15241578750190521_ull128) << '\n';
}
Output
26