1 // Licensed to the Apache Software Foundation (ASF) under one
2 // or more contributor license agreements.  See the NOTICE file
3 // distributed with this work for additional information
4 // regarding copyright ownership.  The ASF licenses this file
5 // to you under the Apache License, Version 2.0 (the
6 // "License"); you may not use this file except in compliance
7 // with the License.  You may obtain a copy of the License at
8 //
9 //   http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing,
12 // software distributed under the License is distributed on an
13 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 // KIND, either express or implied.  See the License for the
15 // specific language governing permissions and limitations
16 // under the License.
17 
18 #pragma once
19 
20 namespace arrow {
21 
22 namespace detail {
23 struct Empty;
24 }  // namespace detail
25 
26 template <typename T = detail::Empty>
27 class Future;
28 template <typename T = detail::Empty>
29 class WeakFuture;
30 class FutureWaiter;
31 
32 class TimestampParser;
33 
34 namespace internal {
35 
36 class Executor;
37 class TaskGroup;
38 class ThreadPool;
39 
40 }  // namespace internal
41 
42 struct Compression {
43   /// \brief Compression algorithm
44   enum type {
45     UNCOMPRESSED,
46     SNAPPY,
47     GZIP,
48     BROTLI,
49     ZSTD,
50     LZ4,
51     LZ4_FRAME,
52     LZO,
53     BZ2,
54     LZ4_HADOOP
55   };
56 };
57 
58 namespace util {
59 class Compressor;
60 class Decompressor;
61 class Codec;
62 }  // namespace util
63 
64 }  // namespace arrow
65