4 ms·

Explicit cancellation can be had just by.. dropping the Future. Its great to have a Rust expert to turn up in a Go thread to educate the masses. I have one qu

• Nullabillity 6y ago
  It's not very useful to borrow futures, so that tends not to be an issue in practice.
• msbarnett 6y ago
  > I have one question from the cheap seats though. How do you drop the Future, with a decision made at runtime, given that lifetimes are part of the type system? Trivially, something like let future = some_long_running_async_function(); let timer = delay(Duration::from_millis(10000)); select! { result = future => { // handle result of future completing successfully }, _ = timer => { // future missed the deadline, drop it, terminating execution. std::mem::drop(future); } } If this were wrapped in a function you could also just return out of the timer branch and let the future naturally drop as the stack popped.