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  * An operation on two {@code double} operands yielding a {@code double} result.
  29  *
  30  * @since 1.8
  31  */
  32 public interface DoubleBinaryOperator extends BinaryOperator<Double> {
  33 
  34     @Override
  35     public default Double operate(Double left, Double right) { return operateAsDouble((double) left, (double) right); }
  36 
  37     /**
  38      * Returns the {@code double} result of the operation upon the
  39      * {@code double} operands. The parameters are named {@code left} and
  40      * {@code right} for operations where the order of parameters matters.
  41      *
  42      * @param left the left operand value
  43      * @param right  the right operand value
  44      * @return the result of the operation
  45      */
  46     public double operateAsDouble(double left, double right);
  47 }