--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/util/function/DoubleBinaryOperator.java	Mon Nov 26 15:08:13 2012 -0800
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.util.function;
+
+/**
+ * An operation on two {@code double} operands yielding a {@code double} result.
+ *
+ * @since 1.8
+ */
+public interface DoubleBinaryOperator /* extends BinaryOperator<Double> */ {
+//
+//    @Override
+//    public default Double operate(Double left, Double right) { return operateAsDouble((double) left, (double) right); }
+
+    /**
+     * Returns the {@code double} result of the operation upon the
+     * {@code double} operands. The parameters are named {@code left} and
+     * {@code right} for operations where the order of parameters matters.
+     *
+     * @param left the left operand value
+     * @param right  the right operand value
+     * @return the result of the operation
+     */
+    public double operateAsDouble(double left, double right);
+}