/** Pack the value into the box so that it is passed by reference */
export interface Box<T> {
    val: T;
}
/** Pack the value into the box so that it is passed by reference */
export declare function box<T>(val: T): Box<T>;
/** Take the value from the Box */
export declare function getVal<T>(box: Box<T>): T;
/** Set the value to Box */
export declare function setVal<T>(box: Box<T>, val: T): Box<T>;