<< operator in objective c enum?

Question

I was looking for something and got in to this enum is apple UITableViewCell.h.

I am sorry if this is trivial but I wonder/curious what is the point of this.

I

Answer 1

Its actually BItwise shift operator

<<  Indicates the bits are to be shifted to the left.
>>  Indicates the bits are to be shifted to the right.

So in your statement the value of 1 << 0 is 1 and 1 << 1 is 2