Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/third_party/rust/futures-util/src/future/ready.rs b/third_party/rust/futures-util/src/future/ready.rs
new file mode 100644
index 0000000000..e3d791b3cf
--- /dev/null
+++ b/third_party/rust/futures-util/src/future/ready.rs
@@ -0,0 +1,82 @@
+use super::assert_future;
+use core::pin::Pin;
+use futures_core::future::{FusedFuture, Future};
+use futures_core::task::{Context, Poll};
+
+/// Future for the [`ready`](ready()) function.
+#[derive(Debug, Clone)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct Ready<T>(Option<T>);
+
+impl<T> Ready<T> {
+    /// Unwraps the value from this immediately ready future.
+    #[inline]
+    pub fn into_inner(mut self) -> T {
+        self.0.take().unwrap()
+    }
+}
+
+impl<T> Unpin for Ready<T> {}
+
+impl<T> FusedFuture for Ready<T> {
+    fn is_terminated(&self) -> bool {
+        self.0.is_none()
+    }
+}
+
+impl<T> Future for Ready<T> {
+    type Output = T;
+
+    #[inline]
+    fn poll(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<T> {
+        Poll::Ready(self.0.take().expect("Ready polled after completion"))
+    }
+}
+
+/// Creates a future that is immediately ready with a value.
+///
+/// # Examples
+///
+/// ```
+/// # futures::executor::block_on(async {
+/// use futures::future;
+///
+/// let a = future::ready(1);
+/// assert_eq!(a.await, 1);
+/// # });
+/// ```
+pub fn ready<T>(t: T) -> Ready<T> {
+    assert_future::<T, _>(Ready(Some(t)))
+}
+
+/// Create a future that is immediately ready with a success value.
+///
+/// # Examples
+///
+/// ```
+/// # futures::executor::block_on(async {
+/// use futures::future;
+///
+/// let a = future::ok::<i32, i32>(1);
+/// assert_eq!(a.await, Ok(1));
+/// # });
+/// ```
+pub fn ok<T, E>(t: T) -> Ready<Result<T, E>> {
+    Ready(Some(Ok(t)))
+}
+
+/// Create a future that is immediately ready with an error value.
+///
+/// # Examples
+///
+/// ```
+/// # futures::executor::block_on(async {
+/// use futures::future;
+///
+/// let a = future::err::<i32, i32>(1);
+/// assert_eq!(a.await, Err(1));
+/// # });
+/// ```
+pub fn err<T, E>(err: E) -> Ready<Result<T, E>> {
+    Ready(Some(Err(err)))
+}