1 files changed, 63 insertions, 0 deletions
diff --git a/library/core/src/future/poll_fn.rs b/library/core/src/future/poll_fn.rs
new file mode 100644
index 000000000..db2a52332
--- /dev/null
+++ b/library/core/src/future/poll_fn.rs
@@ -0,0 +1,63 @@
+use crate::fmt;
+use crate::future::Future;
+use crate::pin::Pin;
+use crate::task::{Context, Poll};
+
+/// Creates a future that wraps a function returning [`Poll`].
+///
+/// Polling the future delegates to the wrapped function.
+///
+/// # Examples
+///
+/// ```
+/// # async fn run() {
+/// use core::future::poll_fn;
+/// use std::task::{Context, Poll};
+///
+/// fn read_line(_cx: &mut Context<'_>) -> Poll<String> {
+///     Poll::Ready("Hello, World!".into())
+/// }
+///
+/// let read_future = poll_fn(read_line);
+/// assert_eq!(read_future.await, "Hello, World!".to_owned());
+/// # }
+/// ```
+#[stable(feature = "future_poll_fn", since = "1.64.0")]
+pub fn poll_fn<T, F>(f: F) -> PollFn<F>
+where
+    F: FnMut(&mut Context<'_>) -> Poll<T>,
+{
+    PollFn { f }
+}
+
+/// A Future that wraps a function returning [`Poll`].
+///
+/// This `struct` is created by [`poll_fn()`]. See its
+/// documentation for more.
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+#[stable(feature = "future_poll_fn", since = "1.64.0")]
+pub struct PollFn<F> {
+    f: F,
+}
+
+#[stable(feature = "future_poll_fn", since = "1.64.0")]
+impl<F> Unpin for PollFn<F> {}
+
+#[stable(feature = "future_poll_fn", since = "1.64.0")]
+impl<F> fmt::Debug for PollFn<F> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("PollFn").finish()
+    }
+}
+
+#[stable(feature = "future_poll_fn", since = "1.64.0")]
+impl<T, F> Future for PollFn<F>
+where
+    F: FnMut(&mut Context<'_>) -> Poll<T>,
+{
+    type Output = T;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
+        (&mut self.f)(cx)
+    }
+}