Constrained genericity: Difference between revisions

=={{header|Objeck}}==

All generic 'T' types associated with the FoodBox must implement the 'Eatable' interface. Generic constrains may either be an interface or a sub-classed type.

<lang objeck>use Collection.Generic;

interface Eatable {

method : virtual : Eat() ~ Nil;

}

class FoodBox<T : Eatable> {

food : List<T>;

}

class Plum implements Eatable {

method : Eat() ~ Nil {

"Yummy Plum!"->PrintLine();

}

}

class Genericity {

function : Main(args : String[]) ~ Nil {

plums : FoodBox<Plum>;

}

}</lang>