@tolokoban/tgd/lib/dist/reference-map.d.ts

ToloGameDev library for WebGL2

/**
 * A Reference Map counts how many time you want to insert the same key.
 * And it tells you when you delete it as many times.
 */
export default class ReferenceMap<KeyType, ValueType> {
    private readonly map;
    private readonly count;
    /**
     * If `key` is already stored in the map,
     * we add a reference to the mapped value and return it.
     * If not, we create the mapped value by calling `factory()`.
     */
    add(key: KeyType, factory: () => ValueType): ValueType;
    /**
     * Delete a reference to `key`.
     * If the last reference has been removed,
     * then return the mapped value, otherwise
     * return `undefined`.
     */
    delete(key: KeyType): ValueType | undefined;
}
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