afb81b8278
Some checks failed
Docker. / Ubuntu (push) Has been cancelled
User-agent updater. / User-agent (push) Failing after 15s
Lock Threads / lock (push) Failing after 10s
Waiting for answer. / waiting-for-answer (push) Failing after 22s
Close stale issues and PRs / stale (push) Successful in 13s
Needs user action. / needs-user-action (push) Failing after 8s
Can't reproduce. / cant-reproduce (push) Failing after 8s
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
// 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
|
|
|
|
namespace rpl {
|
|
namespace details {
|
|
|
|
class skip_helper {
|
|
public:
|
|
skip_helper(int count) : _count(count) {
|
|
}
|
|
|
|
template <
|
|
typename Value,
|
|
typename Error,
|
|
typename Generator>
|
|
auto operator()(producer<Value, Error, Generator> &&initial) {
|
|
return make_producer<Value, Error>([
|
|
initial = std::move(initial),
|
|
skipping = _count
|
|
](const auto &consumer) mutable {
|
|
auto count = consumer.template make_state<int>(skipping);
|
|
auto initial_consumer = make_consumer<Value, Error>(
|
|
[consumer, count](auto &&value) {
|
|
if (*count) {
|
|
--*count;
|
|
} else {
|
|
consumer.put_next_forward(
|
|
std::forward<decltype(value)>(value));
|
|
}
|
|
}, [consumer](auto &&error) {
|
|
consumer.put_error_forward(
|
|
std::forward<decltype(error)>(error));
|
|
}, [consumer] {
|
|
consumer.put_done();
|
|
});
|
|
consumer.add_lifetime(initial_consumer.terminator());
|
|
return std::move(initial).start_existing(initial_consumer);
|
|
});
|
|
}
|
|
|
|
private:
|
|
int _count = 0;
|
|
|
|
};
|
|
|
|
} // namespace details
|
|
|
|
inline auto skip(int count)
|
|
-> details::skip_helper {
|
|
Expects(count >= 0);
|
|
|
|
return details::skip_helper(count);
|
|
}
|
|
|
|
} // namespace rpl
|