001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.lang3.function;
019
020import java.util.function.DoubleSupplier;
021
022/**
023 * A functional interface like {@link DoubleSupplier} that declares a {@link Throwable}.
024 *
025 * @param <E> The kind of thrown exception or error.
026 * @since 3.11
027 */
028@FunctionalInterface
029public interface FailableDoubleSupplier<E extends Throwable> {
030
031    /**
032     * Supplies a double.
033     *
034     * @return a result
035     * @throws E if the supplier fails
036     */
037    double getAsDouble() throws E;
038}