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