void on_connect(composite_subscription cs) {
if (connection.empty()) {
// the lifetime of each connect is independent
auto destination = subject_value.get_subscriber();
// when the paramter is unsubscribed it should
// unsubscribe the most recent connection
connection.reset(cs.add(destination.get_subscription()));
// when the connection is finished it should shutdown the connection
destination.add(make_subscription(
[cs, this](){
cs.remove(this->connection.get());
this->connection.reset();
}));
source.subscribe(destination);
}
}
void remove(weak_subscription w) const {
return lifetime.remove(std::move(w));
}