1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.functor; 18 19 /** 20 * Marker interface for nullary (zero-argument) functors. 21 * <p> 22 * Implementors are encouraged but not required to make their functors 23 * {@link java.io.Serializable Serializable}. 24 * </p> 25 * 26 * @since 1.0 27 * @version $Revision: 647297 $ $Date: 2008-04-11 17:14:50 -0300 (Fri, 11 Apr 2008) $ 28 */ 29 public interface NullaryFunctor extends Functor { 30 }