/** @packageDocumentation
 * @module Tiles
 */
import { BeTimePoint } from "@itwin/core-bentley";
import { TileUser } from "./internal";
/** A marker associated with a [[Tile]] to track usage of that tile by any number of [[TileUser]]s.
 * The marker tracks:
 *  - the set of [[TileUser]]s by which the tile is in use for some purpose (displayed, preloaded, requested, selected for shadow map, etc); and
 *  - the most recent time at which any tile user declared its use of the tile.
 * The marker is used to allow tiles to be discarded after they become disused by any tile user, via [[Tile.prune]].
 * @see [[Tile.usageMarker]].
 * @public
 * @extensions
 */
export declare class TileUsageMarker {
    private _timePoint;
    /** Constructs a usage marker with its timepoint set to the current time and its set of [[TileUser]]s empty. */
    constructor();
    /** Returns true if this tile is currently in use by no [[TileUser]]s and its timestamp pre-dates `expirationTime`. */
    isExpired(expirationTime: BeTimePoint): boolean;
    /** Returns true if this tile is currently in use by any [[TileUser]]. */
    getIsTileInUse(): boolean;
    /** Returns true if this tile's timestamp pre-dates `expirationTime`, without checking if it is in use. */
    isTimestampExpired(expirationTime: BeTimePoint): boolean;
    /** Updates the timestamp to the specified time and marks the tile as being in use by the specified [[TileUser]]. */
    mark(user: TileUser, time: BeTimePoint): void;
}
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