- gstate-filter proc seed genprocedure
Returns a generator that obtains items from the source generator and passes an item and a state (whose initial value is seed) as arguments to proc. Proc in turn returns two values, a boolean and a new value of the state. If the boolean is true, the item is returned; otherwise, this algorithm is repeated until gen is exhausted, at which point the returned generator is also exhausted. The final value of the state is discarded.