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//! Definition of the `PollFn` combinator use core::fmt; use core::pin::Pin; use futures_core::stream::Stream; use futures_core::task::{Context, Poll}; /// Stream for the [`poll_fn`] function. #[must_use = "streams do nothing unless polled"] pub struct PollFn<F> { f: F, } impl<F> Unpin for PollFn<F> {} impl<F> fmt::Debug for PollFn<F> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("PollFn").finish() } } /// Creates a new stream wrapping a function returning `Poll<Option<T>>`. /// /// Polling the returned stream calls the wrapped function. /// /// # Examples /// /// ``` /// use futures::stream::poll_fn; /// use futures::task::Poll; /// /// let mut counter = 1usize; /// /// let read_stream = poll_fn(move |_| -> Poll<Option<String>> { /// if counter == 0 { return Poll::Ready(None); } /// counter -= 1; /// Poll::Ready(Some("Hello, World!".to_owned())) /// }); /// ``` pub fn poll_fn<T, F>(f: F) -> PollFn<F> where F: FnMut(&mut Context<'_>) -> Poll<Option<T>>, { PollFn { f } } impl<T, F> Stream for PollFn<F> where F: FnMut(&mut Context<'_>) -> Poll<Option<T>>, { type Item = T; fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<T>> { (&mut self.f)(cx) } }