From 43a97878ce14b72f0981164f87f2e35e14151312 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 11:22:09 +0200
Subject: Adding upstream version 110.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../rust/futures-0.1.31/src/future/result.rs       | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 third_party/rust/futures-0.1.31/src/future/result.rs

(limited to 'third_party/rust/futures-0.1.31/src/future/result.rs')

diff --git a/third_party/rust/futures-0.1.31/src/future/result.rs b/third_party/rust/futures-0.1.31/src/future/result.rs
new file mode 100644
index 0000000000..5c44a63e1f
--- /dev/null
+++ b/third_party/rust/futures-0.1.31/src/future/result.rs
@@ -0,0 +1,81 @@
+//! Definition of the `Result` (immediately finished) combinator
+
+use core::result;
+
+use {Future, Poll, Async};
+
+/// A future representing a value that is immediately ready.
+///
+/// Created by the `result` function.
+#[derive(Debug, Clone)]
+#[must_use = "futures do nothing unless polled"]
+// TODO: rename this to `Result` on the next major version
+pub struct FutureResult<T, E> {
+    inner: Option<result::Result<T, E>>,
+}
+
+/// Creates a new "leaf future" which will resolve with the given result.
+///
+/// The returned future represents a computation which is finished immediately.
+/// This can be useful with the `finished` and `failed` base future types to
+/// convert an immediate value to a future to interoperate elsewhere.
+///
+/// # Examples
+///
+/// ```
+/// use futures::future::*;
+///
+/// let future_of_1 = result::<u32, u32>(Ok(1));
+/// let future_of_err_2 = result::<u32, u32>(Err(2));
+/// ```
+pub fn result<T, E>(r: result::Result<T, E>) -> FutureResult<T, E> {
+    FutureResult { inner: Some(r) }
+}
+
+/// Creates a "leaf future" from an immediate value of a finished and
+/// successful computation.
+///
+/// The returned future is similar to `result` where it will immediately run a
+/// scheduled callback with the provided value.
+///
+/// # Examples
+///
+/// ```
+/// use futures::future::*;
+///
+/// let future_of_1 = ok::<u32, u32>(1);
+/// ```
+pub fn ok<T, E>(t: T) -> FutureResult<T, E> {
+    result(Ok(t))
+}
+
+/// Creates a "leaf future" from an immediate value of a failed computation.
+///
+/// The returned future is similar to `result` where it will immediately run a
+/// scheduled callback with the provided value.
+///
+/// # Examples
+///
+/// ```
+/// use futures::future::*;
+///
+/// let future_of_err_1 = err::<u32, u32>(1);
+/// ```
+pub fn err<T, E>(e: E) -> FutureResult<T, E> {
+    result(Err(e))
+}
+
+impl<T, E> Future for FutureResult<T, E> {
+    type Item = T;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<T, E> {
+        self.inner.take().expect("cannot poll Result twice").map(Async::Ready)
+    }
+}
+
+impl<T, E> From<Result<T, E>> for FutureResult<T, E> {
+    fn from(r: Result<T, E>) -> Self {
+        result(r)
+    }
+}
-- 
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