Info shared media and common groups counters.

Telegram/SourceFiles/rpl/range.h

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+/*
+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>
+
+namespace rpl {
+
+template <typename Value, typename Error = no_error>
+inline producer<std::decay_t<Value>, Error> single(Value &&value) {
+	using consumer_t = consumer<std::decay_t<Value>, Error>;
+	return [value = std::forward<Value>(value)](
+			const consumer_t &consumer) mutable {
+		consumer.put_next(std::move(value));
+		consumer.put_done();
+		return lifetime();
+	};
+}
+
+template <typename Error = no_error>
+inline producer<empty_value, Error> single() {
+	return [](const consumer<empty_value, Error> &consumer) {
+		consumer.put_next({});
+		consumer.put_done();
+		return lifetime();
+	};
+}
+
+template <typename Value, typename Error = no_error>
+inline producer<Value, Error> vector(std::vector<Value> &&values) {
+	return [values = std::move(values)](
+			const consumer<Value, Error> &consumer) mutable {
+		for (auto &value : values) {
+			consumer.put_next(std::move(value));
+		}
+		consumer.put_done();
+		return lifetime();
+	};
+}
+
+template <typename Value, typename Error = no_error, typename Range>
+inline producer<Value, Error> range(Range &&range) {
+	return vector(std::vector<Value>(
+		std::begin(range),
+		std::end(range)));
+}
+
+inline producer<int> ints(int from, int till) {
+	Expects(from <= till);
+	return [from, till](const consumer<int> &consumer) {
+		for (auto i = from; i != till; ++i) {
+			consumer.put_next_copy(i);
+		}
+		consumer.put_done();
+		return lifetime();
+	};
+}
+
+inline producer<int> ints(int count) {
+	return ints(0, count);
+}
+
+} // namespace rpl
+