end
return res
end
+
+ # Is `self` a power of two ?
+ #
+ # ~~~nit
+ # assert not 3.is_pow2
+ # assert 2.is_pow2
+ # assert 1.is_pow2
+ # assert not 0.is_pow2
+ # ~~~
+ fun is_pow2: Bool do return self != 0 and (self & self - 1) == 0
end
redef class Byte