52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "base/optional.h"
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#include "base/variant.h"
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#include <rpl/map.h>
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#include <rpl/producer.h>
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namespace rpl {
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template <
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typename Value,
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typename Error,
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typename GeneratorTest,
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typename GeneratorA,
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typename GeneratorB>
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inline auto conditional(
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rpl::producer<bool, Error, GeneratorTest> &&test,
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rpl::producer<Value, Error, GeneratorA> &&a,
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rpl::producer<Value, Error, GeneratorB> &&b) {
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return rpl::combine(
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std::move(test),
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std::move(a),
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std::move(b)
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) | rpl::map([](bool test, Value &&a, Value &&b) {
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return test ? std::move(a) : std::move(b);
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});
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//struct conditional_state {
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// std::optional<Value> a;
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// std::optional<Value> b;
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// char state = -1;
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// int working = 3;
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//};
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//return rpl::make_producer<Value, Error>([
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// test = std::move(test),
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// a = std::move(a),
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// b = std::move(b)
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//](const auto &consumer) mutable {
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// auto result = lifetime();
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// const auto state = result.make_state<conditional_state>();
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// result.add(std::move(test).start())
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// return result;
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//});
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}
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} // namespace rpl
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