forked from mirror/async-std
bac74c2d7f
* Add future::poll_fn * Replace all uses of poll_fn with the new one * Remove some uses of futures * Simplify ReadDir and DirEntry * Remove some use of futures from File * Use futures subcrates * Fix imports in docs * Remove futures-util dependency * Remove futures-executor-preview * Refactor * Require more features in the futures-preview crate
45 lines
923 B
Rust
45 lines
923 B
Rust
use std::pin::Pin;
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use crate::task::{Context, Poll};
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/// Creates a stream that yields the same item repeatedly.
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///
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/// # Examples
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///
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/// ```
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/// # fn main() { async_std::task::block_on(async {
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/// #
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/// use async_std::prelude::*;
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/// use async_std::stream;
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///
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/// let mut s = stream::repeat(7);
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///
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/// assert_eq!(s.next().await, Some(7));
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/// assert_eq!(s.next().await, Some(7));
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/// #
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/// # }) }
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/// ```
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pub fn repeat<T>(item: T) -> Repeat<T>
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where
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T: Clone,
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{
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Repeat { item }
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}
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/// A stream that yields the same item repeatedly.
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///
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/// This stream is constructed by the [`repeat`] function.
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///
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/// [`repeat`]: fn.repeat.html
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#[derive(Debug)]
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pub struct Repeat<T> {
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item: T,
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}
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impl<T: Clone> futures_core::stream::Stream for Repeat<T> {
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type Item = T;
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fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<Self::Item>> {
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Poll::Ready(Some(self.item.clone()))
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}
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}
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