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>
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use crate::stream::Stream; use core::marker::PhantomData; use core::pin::Pin; use core::task::{Context, Poll}; /// Stream for the [`pending`](fn@pending) function. #[derive(Debug)] #[must_use = "streams do nothing unless polled"] pub struct Pending<T>(PhantomData<T>); impl<T> Unpin for Pending<T> {} unsafe impl<T> Send for Pending<T> {} unsafe impl<T> Sync for Pending<T> {} /// Creates a stream that is never ready /// /// The returned stream is never ready. Attempting to call /// [`next()`](crate::stream::StreamExt::next) will never complete. Use /// [`stream::empty()`](super::empty()) to obtain a stream that is is /// immediately empty but returns no values. /// /// # Examples /// /// Basic usage: /// /// ```no_run /// use tokio::stream::{self, StreamExt}; /// /// #[tokio::main] /// async fn main() { /// let mut never = stream::pending::<i32>(); /// /// // This will never complete /// never.next().await; /// /// unreachable!(); /// } /// ``` pub const fn pending<T>() -> Pending<T> { Pending(PhantomData) } impl<T> Stream for Pending<T> { type Item = T; fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<T>> { Poll::Pending } fn size_hint(&self) -> (usize, Option<usize>) { (0, None) } }