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>
---
 third_party/rust/futures-0.1.31/src/future/join.rs | 172 +++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 third_party/rust/futures-0.1.31/src/future/join.rs

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

diff --git a/third_party/rust/futures-0.1.31/src/future/join.rs b/third_party/rust/futures-0.1.31/src/future/join.rs
new file mode 100644
index 0000000000..452121200b
--- /dev/null
+++ b/third_party/rust/futures-0.1.31/src/future/join.rs
@@ -0,0 +1,172 @@
+#![allow(non_snake_case)]
+
+use core::fmt;
+use core::mem;
+
+use {Future, Poll, IntoFuture, Async};
+
+macro_rules! generate {
+    ($(
+        $(#[$doc:meta])*
+        ($Join:ident, $new:ident, <A, $($B:ident),*>),
+    )*) => ($(
+        $(#[$doc])*
+        #[must_use = "futures do nothing unless polled"]
+        pub struct $Join<A, $($B),*>
+            where A: Future,
+                  $($B: Future<Error=A::Error>),*
+        {
+            a: MaybeDone<A>,
+            $($B: MaybeDone<$B>,)*
+        }
+
+        impl<A, $($B),*> fmt::Debug for $Join<A, $($B),*>
+            where A: Future + fmt::Debug,
+                  A::Item: fmt::Debug,
+                  $(
+                      $B: Future<Error=A::Error> + fmt::Debug,
+                      $B::Item: fmt::Debug
+                  ),*
+        {
+            fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+                fmt.debug_struct(stringify!($Join))
+                    .field("a", &self.a)
+                    $(.field(stringify!($B), &self.$B))*
+                    .finish()
+            }
+        }
+
+        pub fn $new<A, $($B),*>(a: A, $($B: $B),*) -> $Join<A, $($B),*>
+            where A: Future,
+                  $($B: Future<Error=A::Error>),*
+        {
+            $Join {
+                a: MaybeDone::NotYet(a),
+                $($B: MaybeDone::NotYet($B)),*
+            }
+        }
+
+        impl<A, $($B),*> $Join<A, $($B),*>
+            where A: Future,
+                  $($B: Future<Error=A::Error>),*
+        {
+            fn erase(&mut self) {
+                self.a = MaybeDone::Gone;
+                $(self.$B = MaybeDone::Gone;)*
+            }
+        }
+
+        impl<A, $($B),*> Future for $Join<A, $($B),*>
+            where A: Future,
+                  $($B: Future<Error=A::Error>),*
+        {
+            type Item = (A::Item, $($B::Item),*);
+            type Error = A::Error;
+
+            fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+                let mut all_done = match self.a.poll() {
+                    Ok(done) => done,
+                    Err(e) => {
+                        self.erase();
+                        return Err(e)
+                    }
+                };
+                $(
+                    all_done = match self.$B.poll() {
+                        Ok(done) => all_done && done,
+                        Err(e) => {
+                            self.erase();
+                            return Err(e)
+                        }
+                    };
+                )*
+
+                if all_done {
+                    Ok(Async::Ready((self.a.take(), $(self.$B.take()),*)))
+                } else {
+                    Ok(Async::NotReady)
+                }
+            }
+        }
+
+        impl<A, $($B),*> IntoFuture for (A, $($B),*)
+            where A: IntoFuture,
+        $(
+            $B: IntoFuture<Error=A::Error>
+        ),*
+        {
+            type Future = $Join<A::Future, $($B::Future),*>;
+            type Item = (A::Item, $($B::Item),*);
+            type Error = A::Error;
+
+            fn into_future(self) -> Self::Future {
+                match self {
+                    (a, $($B),+) => {
+                        $new(
+                            IntoFuture::into_future(a),
+                            $(IntoFuture::into_future($B)),+
+                        )
+                    }
+                }
+            }
+        }
+
+    )*)
+}
+
+generate! {
+    /// Future for the `join` combinator, waiting for two futures to
+    /// complete.
+    ///
+    /// This is created by the `Future::join` method.
+    (Join, new, <A, B>),
+
+    /// Future for the `join3` combinator, waiting for three futures to
+    /// complete.
+    ///
+    /// This is created by the `Future::join3` method.
+    (Join3, new3, <A, B, C>),
+
+    /// Future for the `join4` combinator, waiting for four futures to
+    /// complete.
+    ///
+    /// This is created by the `Future::join4` method.
+    (Join4, new4, <A, B, C, D>),
+
+    /// Future for the `join5` combinator, waiting for five futures to
+    /// complete.
+    ///
+    /// This is created by the `Future::join5` method.
+    (Join5, new5, <A, B, C, D, E>),
+}
+
+#[derive(Debug)]
+enum MaybeDone<A: Future> {
+    NotYet(A),
+    Done(A::Item),
+    Gone,
+}
+
+impl<A: Future> MaybeDone<A> {
+    fn poll(&mut self) -> Result<bool, A::Error> {
+        let res = match *self {
+            MaybeDone::NotYet(ref mut a) => a.poll()?,
+            MaybeDone::Done(_) => return Ok(true),
+            MaybeDone::Gone => panic!("cannot poll Join twice"),
+        };
+        match res {
+            Async::Ready(res) => {
+                *self = MaybeDone::Done(res);
+                Ok(true)
+            }
+            Async::NotReady => Ok(false),
+        }
+    }
+
+    fn take(&mut self) -> A::Item {
+        match mem::replace(self, MaybeDone::Gone) {
+            MaybeDone::Done(a) => a,
+            _ => panic!(),
+        }
+    }
+}
-- 
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