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Brownies Collections complements the Java Collections Framework. GapList combines the strengths of both ArrayList and LinkedList. BigList is a list optimized for storing large number of elements. There are specialized List implementations for all primitive data types (IntGapList, IntBigList, IntObjGapList, IntObjBigList). The key collection classes offer support for keys and constraints for lists and collections (KeyList, KeyCollection, KeySet, Key1List, Key1Collection, Key1Set, Key2List, Key2Collection, Key2Set).

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/*
 * Copyright 2013 by Thomas Mauch
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * $Id: IFunction.java 2673 2015-01-06 01:11:54Z origo $
 */
package org.magicwerk.brownies.collections.function;

/**
 * A function interface for use in pre-Java 8.
 * In Java 8 and later, java.util.function.Function could then be used.
 *
 * @author Thomas Mauch
 * @version $Id: IFunction.java 2673 2015-01-06 01:11:54Z origo $
 *
 * @param  type of input argument
 * @param  type of return value
 */
public interface IFunction {
    /**
     * Returns key for given value.
     *
     * @param elem 	element to apply function to
     * @return  	result of function evaluation
     */
    public R apply(T elem);
}