#pragma once

template <typename Int>
bool is_pow_of_two(Int n){
	return n && !(n & (n - 1));
}

template <typename Int>
bool is_even(Int n){
	return (n & 1) == 0;
}

// calculates integer 2-log such that:
// 2^(two_log(x)) >= x > 2^(two_log(x) - 1)
inline unsigned int two_log(unsigned int x){
	if(x <= 1) return 0;
	return 8*sizeof(unsigned int) - unsigned(__builtin_clz(x-1));
}