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Generic Interfaces

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Generic Interfaces

Generics can be used to define generic interfaces. Taking the Iterable interface from the standard library as an example, its member function iterator needs to return an Iterator type, which serves as a container's traverser. Iterator is a generic interface that contains a next member function for retrieving the next element from the container type. The return type of the next member function is a type that needs to be specified during usage, so Iterator requires the declaration of generic parameters.

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public interface Iterable<E> {
    func iterator(): Iterator<E>
}

public interface Iterator<E> <: Iterable<E> {
    func next(): Option<E>
}

public interface Collection<T> <: Iterable<T> {
     prop size: Int64
     func isEmpty(): Bool
}