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package org.opentrafficsim.road.gtu.lane.perception;

import org.opentrafficsim.road.gtu.lane.perception.headway.Headway;

/**
 * Iterable set of elements, sorted close to far.
 * 
 * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. 

 * BSD-style license. See OpenTrafficSim License.
 * 
 * @author Alexander Verbraeck
 * @author Peter Knoppers
 * @author Wouter Schakel
 * @param  headway type
 */
public interface PerceptionIterable extends Iterable
{

    /**
     * Returns the first element.
     * @return H; first element
     */
    H first();

    /**
     * Returns whether this iterable is empty.
     * @return whether this iterable is empty
     */
    boolean isEmpty();

}