/**
 * @module History
 * @author Pablo E. --Fidel-- Martínez López <fidel.ml@gmail.com>
 */
/**
 * A {@link Changeable} is a data structure used to register changes over a certain value
 * of a given type.
 *
 * The initial value is supposed to be given on creation, and then subsequent changes
 * can be registered using {@link addChange}.
 * At any moment the current value (that corresponding to the last active change) can be
 * accessed using {@link currentValue}.
 * @group History
 */
export interface Changeable<A> {
    /**
     * Add a change to the history in the current transaction, as the last version
     * of the value.
     * @group API
     */
    addChange(e: A): void;
    /**
     * Describes the current value in the history.
     * @group API
     */
    currentValue(): A;
}
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