1 /* 2 * Copyright (c) 2012, 2013, 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 * Represents a function that produces a double-valued result. This is the 29 * {@code double}-producing primitive specialization for {@link Function}. 30 * 31 * <p>This is a <a href="package-summary.html">functional interface</a> 32 * whose functional method is {@link #applyAsDouble(Object)}. 33 * 34 * @param <T> the type of the input to the function 35 * 36 * @see Function 37 * @since 1.8 38 */ 39 @FunctionalInterface 40 public interface ToDoubleFunction<T> { 41 42 /** 43 * Applies this function to the given argument. 44 * 45 * @param value the function argument 46 * @return the function result 47 */ applyAsDouble(T value)48 double applyAsDouble(T value); 49 } 50