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Contents
use super::assert_stream; use core::pin::Pin; use futures_core::stream::Stream; use futures_core::task::{Context, Poll}; /// Stream for the [`iter`] function. #[derive(Debug, Clone)] #[must_use = "streams do nothing unless polled"] pub struct Iter<I> { iter: I, } impl<I> Iter<I> { /// Acquires a reference to the underlying iterator that this stream is pulling from. pub fn get_ref(&self) -> &I { &self.iter } /// Acquires a mutable reference to the underlying iterator that this stream is pulling from. pub fn get_mut(&mut self) -> &mut I { &mut self.iter } /// Consumes this stream, returning the underlying iterator. pub fn into_inner(self) -> I { self.iter } } impl<I> Unpin for Iter<I> {} /// Converts an `Iterator` into a `Stream` which is always ready /// to yield the next value. /// /// Iterators in Rust don't express the ability to block, so this adapter /// simply always calls `iter.next()` and returns that. /// /// ``` /// # futures::executor::block_on(async { /// use futures::stream::{self, StreamExt}; /// /// let stream = stream::iter(vec![17, 19]); /// assert_eq!(vec![17, 19], stream.collect::<Vec<i32>>().await); /// # }); /// ``` pub fn iter<I>(i: I) -> Iter<I::IntoIter> where I: IntoIterator, { assert_stream::<I::Item, _>(Iter { iter: i.into_iter() }) } impl<I> Stream for Iter<I> where I: Iterator, { type Item = I::Item; fn poll_next(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<I::Item>> { Poll::Ready(self.iter.next()) } fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() } }
Version data entries
4 entries across 4 versions & 1 rubygems