71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#define FOLLY_GEN_FILE_H_
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#include <folly/File.h>
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#include <folly/gen/Base.h>
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#include <folly/io/IOBuf.h>
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namespace folly {
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namespace gen {
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namespace detail {
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class FileReader;
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class FileWriter;
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} // namespace detail
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/**
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* Generator that reads from a file with a buffer of the given size.
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* Reads must be buffered (the generator interface expects the generator
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* to hold each value).
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*/
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template <class S = detail::FileReader>
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S fromFile(File file, size_t bufferSize = 4096) {
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return S(std::move(file), IOBuf::create(bufferSize));
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}
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/**
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* Generator that reads from a file using a given buffer.
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*/
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template <class S = detail::FileReader>
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S fromFile(File file, std::unique_ptr<IOBuf> buffer) {
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return S(std::move(file), std::move(buffer));
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}
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/**
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* Sink that writes to a file with a buffer of the given size.
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* If bufferSize is 0, writes will be unbuffered.
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*/
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template <class S = detail::FileWriter>
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S toFile(File file, size_t bufferSize = 4096) {
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return S(std::move(file), bufferSize ? nullptr : IOBuf::create(bufferSize));
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}
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/**
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* Sink that writes to a file using a given buffer.
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* If the buffer is nullptr, writes will be unbuffered.
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*/
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template <class S = detail::FileWriter>
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S toFile(File file, std::unique_ptr<IOBuf> buffer) {
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return S(std::move(file), std::move(buffer));
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}
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} // namespace gen
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} // namespace folly
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#include <folly/gen/File-inl.h>
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