61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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/*
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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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#include <istream>
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#include <string>
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#include <folly/gen/Core.h>
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namespace folly {
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namespace gen {
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namespace detail {
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/**
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* Generates lines by calling std::getline() on a given istream.
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*/
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class IStreamByLine : public GenImpl<std::string&&, IStreamByLine> {
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public:
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IStreamByLine(std::istream& in) : in_(in) {}
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template <class Body>
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bool apply(Body&& body) const {
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for (std::string line; std::getline(in_, line);) {
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if (!body(std::move(line))) {
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return false;
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}
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}
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return true;
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}
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// Technically, there could be infinite files (e.g. /dev/random), but people
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// who open those can do so at their own risk.
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static constexpr bool infinite = false;
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private:
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std::istream& in_;
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};
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} // namespace detail
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inline detail::IStreamByLine byLine(std::istream& in) {
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return detail::IStreamByLine(in);
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}
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} // namespace gen
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} // namespace folly
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