tdesktop/Telegram/SourceFiles/rpl/range.h

99 lines
2.4 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
#include <rpl/producer.h>
#include <vector>
namespace rpl {
template <typename Value>
inline auto single(Value &&value) {
return make_producer<std::decay_t<Value>>([
value = std::forward<Value>(value)
](const auto &consumer) mutable {
consumer.put_next(std::move(value));
consumer.put_done();
return lifetime();
});
}
inline auto single() {
return make_producer<>([](const auto &consumer) {
consumer.put_next({});
consumer.put_done();
return lifetime();
});
}
template <typename Value>
inline auto vector(std::vector<Value> &&values) {
return make_producer<Value>([
values = std::move(values)
](const auto &consumer) mutable {
for (auto &value : values) {
consumer.put_next(std::move(value));
}
consumer.put_done();
return lifetime();
});
}
inline auto vector(std::vector<bool> &&values) {
return make_producer<bool>([
values = std::move(values)
](const auto &consumer) {
for (auto value : values) {
consumer.put_next_copy(value);
}
consumer.put_done();
return lifetime();
});
}
template <
typename Range,
typename Value = std::decay_t<
decltype(*std::begin(std::declval<Range>()))>>
inline auto range(Range &&range) {
return vector(std::vector<Value>(
std::begin(range),
std::end(range)));
}
inline auto ints(int from, int till) {
Expects(from <= till);
return make_producer<int>([from, till](const auto &consumer) {
for (auto i = from; i != till; ++i) {
consumer.put_next_copy(i);
}
consumer.put_done();
return lifetime();
});
}
inline auto ints(int count) {
return ints(0, count);
}
} // namespace rpl