/**
 * @param <E> Element type.
 *            Abstract class for simple functional sets just offering a characteristic function realized by the
 *            contains method.
 */
public abstract class SimpleFunctionalSet<E>
{
	/**
	 * The remaining set.
	 */
	private final SimpleFunctionalSet<E> set;
	
	/**
	 * @param s The remaining set.
	 */
	public SimpleFunctionalSet(SimpleFunctionalSet<E> s)
	{
		this.set = s;
	}
	
	/**
	 * Returns <tt>true</tt> if this set contains the specified element.
	 * More formally, contains(o) returns <tt>true</tt> if and only if this set
	 * contains an element <tt>e</tt> such that
	 * <tt>(o==null&nbsp;?&nbsp;e==null&nbsp;:&nbsp;e.equals(o))</tt>.
	 *
	 * @param o Element whose presence in this set is to be tested.
	 * @return <tt>true</tt> if this set contains the specified element.
	 */
	public abstract boolean contains(Object o);
	
	/**
	 * @return The remaining set.
	 */
	public SimpleFunctionalSet<E> getRemainingSet()
	{
		return this.set;
	}
	
}