82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include "base/lambda.h"
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#include "rpl/consumer.h"
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#include "rpl/lifetime.h"
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namespace rpl {
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template <typename Value, typename Error>
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class producer {
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public:
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template <typename Generator, typename = std::enable_if<std::is_convertible<
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decltype(std::declval<Generator>()(std::declval<consumer<Value, Error>>())),
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lifetime
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>::value>>
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producer(Generator &&generator);
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template <
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typename OnNext,
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typename OnError,
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typename OnDone,
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typename = decltype(std::declval<OnNext>()(std::declval<Value>())),
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typename = decltype(std::declval<OnError>()(std::declval<Error>())),
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typename = decltype(std::declval<OnDone>()())>
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lifetime start(
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OnNext &&next,
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OnError &&error,
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OnDone &&done);
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private:
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base::lambda<lifetime(consumer<Value, Error>)> _generator;
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};
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template <typename Value, typename Error>
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template <typename Generator, typename>
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producer<Value, Error>::producer(Generator &&generator)
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: _generator(std::forward<Generator>(generator)) {
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}
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template <typename Value, typename Error>
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template <
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typename OnNext,
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typename OnError,
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typename OnDone,
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typename,
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typename,
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typename>
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lifetime producer<Value, Error>::start(
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OnNext &&next,
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OnError &&error,
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OnDone &&done) {
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auto result = consumer<Value, Error>(
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std::forward<OnNext>(next),
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std::forward<OnError>(error),
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std::forward<OnDone>(done));
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result.setLifetime(_generator(result));
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return [result] { result.terminate(); };
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}
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} // namespace rpl
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