arrow/util/async_generator_fwd.h

0001 // Licensed to the Apache Software Foundation (ASF) under one
0002 // or more contributor license agreements.  See the NOTICE file
0003 // distributed with this work for additional information
0004 // regarding copyright ownership.  The ASF licenses this file
0005 // to you under the Apache License, Version 2.0 (the
0006 // "License"); you may not use this file except in compliance
0007 // with the License.  You may obtain a copy of the License at
0008 //
0009 //   http://www.apache.org/licenses/LICENSE-2.0
0010 //
0011 // Unless required by applicable law or agreed to in writing,
0012 // software distributed under the License is distributed on an
0013 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
0014 // KIND, either express or implied.  See the License for the
0015 // specific language governing permissions and limitations
0016 // under the License.
0017
0018 #pragma once
0019
0020 #include <functional>
0021
0022 #include "arrow/type_fwd.h"
0023
0024 namespace arrow {
0025
0026 template <typename T>
0027 using AsyncGenerator = std::function<Future<T>()>;
0028
0029 template <typename T, typename V>
0030 class MappingGenerator;
0031
0032 template <typename T, typename ComesAfter, typename IsNext>
0033 class SequencingGenerator;
0034
0035 template <typename T, typename V>
0036 class TransformingGenerator;
0037
0038 template <typename T>
0039 class SerialReadaheadGenerator;
0040
0041 template <typename T>
0042 class ReadaheadGenerator;
0043
0044 template <typename T>
0045 class PushGenerator;
0046
0047 template <typename T>
0048 class MergedGenerator;
0049
0050 template <typename T>
0051 struct Enumerated;
0052
0053 template <typename T>
0054 class EnumeratingGenerator;
0055
0056 template <typename T>
0057 class TransferringGenerator;
0058
0059 template <typename T>
0060 class BackgroundGenerator;
0061
0062 template <typename T>
0063 class GeneratorIterator;
0064
0065 template <typename T>
0066 struct CancellableGenerator;
0067
0068 template <typename T>
0069 class DefaultIfEmptyGenerator;
0070
0071 }  // namespace arrow