import { Hashable } from '../../objects/hash';
import { Equalable } from '../../objects/equals';
/**
 * A Set:
 *  Is a lookup structure to determine if an entry already exists or not.
 *
 * @startuml
 * title VNSet
 * interface VNSet<Key> {
 *   size(): Int
 *   has(key: Key): Boolean,
 *   add(key: Key): Unit
 *   remove(key: Key): Unit
 *   map<T>(m: (k: Key) => T): VNSet<T>
 *   intersect(other: VNSet<Key>): VNSet<Key>
 *   union(other: VNSet<Key>): VNSet<Key>
 *   disjunction(other: VNSet<Key>): VNSet<Key>
 * }
 * @enduml
 */
interface VNSet<Key extends Hashable & Equalable> {
    size(): number;
    has(key: Key): boolean;
    add(key: Key): void;
    remove(key: Key): void;
    map<T extends Hashable & Equalable>(mapper: (key: Key) => T): VNSet<T>;
    iter(): Key[];
    union(other: VNSet<Key>): VNSet<Key>;
    intersection(other: VNSet<Key>): VNSet<Key>;
    disjunction(other: VNSet<Key>): VNSet<Key>;
    difference(other: VNSet<Key>): VNSet<Key>;
    equals(other: VNSet<Key>): boolean;
}
export declare function createHashSet<Key extends Equalable & Hashable>(): VNSet<Key>;
export {};