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//! Definition of the `SelectAll`, finding the first future in a list that //! finishes. use std::mem; use std::prelude::v1::*; use {Future, IntoFuture, Poll, Async}; /// Future for the `select_all` combinator, waiting for one of any of a list of /// futures to complete. /// /// This is created by the `select_all` function. #[derive(Debug)] #[must_use = "futures do nothing unless polled"] pub struct SelectAll<A> where A: Future { inner: Vec<A>, } #[doc(hidden)] pub type SelectAllNext<A> = A; /// Creates a new future which will select over a list of futures. /// /// The returned future will wait for any future within `iter` to be ready. Upon /// completion or failure the item resolved will be returned, along with the /// index of the future that was ready and the list of all the remaining /// futures. /// /// # Panics /// /// This function will panic if the iterator specified contains no items. pub fn select_all<I>(iter: I) -> SelectAll<<I::Item as IntoFuture>::Future> where I: IntoIterator, I::Item: IntoFuture, { let ret = SelectAll { inner: iter.into_iter() .map(|a| a.into_future()) .collect(), }; assert!(ret.inner.len() > 0); ret } impl<A> Future for SelectAll<A> where A: Future, { type Item = (A::Item, usize, Vec<A>); type Error = (A::Error, usize, Vec<A>); fn poll(&mut self) -> Poll<Self::Item, Self::Error> { let item = self.inner.iter_mut().enumerate().filter_map(|(i, f)| { match f.poll() { Ok(Async::NotReady) => None, Ok(Async::Ready(e)) => Some((i, Ok(e))), Err(e) => Some((i, Err(e))), } }).next(); match item { Some((idx, res)) => { self.inner.remove(idx); let rest = mem::replace(&mut self.inner, Vec::new()); match res { Ok(e) => Ok(Async::Ready((e, idx, rest))), Err(e) => Err((e, idx, rest)), } } None => Ok(Async::NotReady), } } }