1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package java.util.function; 26 27 /** 28 * Apply a function to the input object yielding an appropriate {@code double} 29 * value; this is the {@code double}-bearing specialization for 30 * {@link Function}. 31 * 32 * @param <T> the type of input objects to the {@code apply} operation. 33 * 34 * @since 1.8 35 */ 36 public interface DoubleFunction<T> /* extends Function<T,Double> */ { 37 // 38 // /** 39 // * Apply a function to the input object yielding an appropriate 40 // * {@code Double}. 41 // * 42 // * @param t the input object to the function 43 // * @return the function output {@code Double} 44 // */ 45 // @Override 46 // public default Double apply(T t) { return applyAsDouble(t); } 47 48 /** 49 * Apply a function to the input object yielding an appropriate 50 * {@code double} value. 51 * 52 * @param t the input object to the function 53 * @return the function output value 54 */ 55 public double applyAsDouble(T t); 56 }