Class HashSet

src/main/java/wyil/util/BinaryRelation.java:59–80

A simple and rather inefficient implementation of BinaryRelation which employs a HashSet underneath. @author David J. Pearce @param

	 * @param <T>
	 */
	public static class HashSet<T> implements BinaryRelation<T> {
		private java.util.HashSet<Pair<T, T>> relations;

		public HashSet() {
			this.relations = new java.util.HashSet<>();
		}

		@Override
		public boolean get(T lhs, T rhs) {
			return relations.contains(new Pair<>(lhs, rhs));
		}

		@Override
		public void set(T lhs, T rhs, boolean value) {
			Pair<T, T> p = new Pair<>(lhs, rhs);
			if (value) {
				relations.add(p);
			} else {
				relations.remove(p);
			}
		}
	}
}