pastel plover
I'm working on a project that uses no_std, but I need to figure out how to do a await on a vector of futures.
I wanted to use future::join_all but it doesn't work because of no_std.
impl Joiner {
pub fn join_all(mut futures_pin: Pin<Box<VecDeque<Pin<Box<(dyn Future<Output = ()> + 'static)>>>>>) {
let waker = dummy_waker();
let mut context = Context::from_waker(&waker);
let mut futures = futures_pin.as_mut();
while futures.len() > 0 {
let mut future = futures.pop_front().unwrap();
match future.as_mut().poll(&mut context) {
Poll::Ready(_) => {},
Poll::Pending => futures.push_back(future),
}
}
}
}
and
let mut futures = Box::pin(VecDeque::new());
let mut active_ports = Vec::new();
for i in 0u32..17 {futures.push_back(Box::pin(self.set_port_idle(i)));
}
Joiner::join_all(futures);
but
error[E0308]: mismatched types
--> kernel/src/devices/block/mod.rs:123:30
|
119 | futures.push_back(Box::new(self.set_port_idle(i as usize)));
| ------- ---------------------------------------- this argument has type `Box<impl Future<Output = ()>>`...
| |
| ... which causes `futures` to have type `Box<VecDeque<Box<impl Future<Output = ()>>>>`
...
123 | Joiner::join_all(futures);
| ---------------- ^^^^^^^ expected `dyn Future`, found future
| |
| arguments to this function are incorrect
|
= note: expected struct `Box<VecDeque<Box<(dyn Future<Output = ()> + 'static)>>>`
found struct `Box<VecDeque<Box<impl Future<Output = ()>>>>`
= help: you can box the `impl Future<Output = ()>` to coerce it to `Box<(dyn Future<Output = ()> + 'static)>`, but you'll have to change the expected type as well
solemn torrent