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Telegram/lib_rpl/rpl/range.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <rpl/producer.h>
+#include <vector>
+
+namespace rpl {
+
+template <typename Value, typename Error = no_error>
+inline auto single(Value &&value) {
+	return make_producer<std::decay_t<Value>, Error>([
+		value = std::forward<Value>(value)
+	](const auto &consumer) mutable {
+		consumer.put_next(std::move(value));
+		consumer.put_done();
+		return lifetime();
+	});
+}
+
+template <typename Error = no_error>
+inline auto single() {
+	return make_producer<rpl::empty_value, Error>([](const auto &consumer) {
+		consumer.put_next({});
+		consumer.put_done();
+		return lifetime();
+	});
+}
+
+template <typename Value, typename Error = no_error>
+inline auto vector(std::vector<Value> &&values) {
+	return make_producer<Value, Error>([
+		values = std::move(values)
+	](const auto &consumer) mutable {
+		for (auto &value : values) {
+			consumer.put_next(std::move(value));
+		}
+		consumer.put_done();
+		return lifetime();
+	});
+}
+
+template <typename Error = no_error>
+inline auto vector(std::vector<bool> &&values) {
+	return make_producer<bool, Error>([
+		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
+