1 files changed, 298 insertions, 0 deletions
diff --git a/vendor/rayon/src/iter/try_fold.rs b/vendor/rayon/src/iter/try_fold.rs
new file mode 100644
index 0000000..6d1048d
--- /dev/null
+++ b/vendor/rayon/src/iter/try_fold.rs
@@ -0,0 +1,298 @@
+use super::plumbing::*;
+use super::ParallelIterator;
+use super::Try;
+
+use std::fmt::{self, Debug};
+use std::marker::PhantomData;
+use std::ops::ControlFlow::{self, Break, Continue};
+
+impl<U, I, ID, F> TryFold<I, U, ID, F>
+where
+    I: ParallelIterator,
+    F: Fn(U::Output, I::Item) -> U + Sync + Send,
+    ID: Fn() -> U::Output + Sync + Send,
+    U: Try + Send,
+{
+    pub(super) fn new(base: I, identity: ID, fold_op: F) -> Self {
+        TryFold {
+            base,
+            identity,
+            fold_op,
+            marker: PhantomData,
+        }
+    }
+}
+
+/// `TryFold` is an iterator that applies a function over an iterator producing a single value.
+/// This struct is created by the [`try_fold()`] method on [`ParallelIterator`]
+///
+/// [`try_fold()`]: trait.ParallelIterator.html#method.try_fold
+/// [`ParallelIterator`]: trait.ParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Clone)]
+pub struct TryFold<I, U, ID, F> {
+    base: I,
+    identity: ID,
+    fold_op: F,
+    marker: PhantomData<U>,
+}
+
+impl<U, I: ParallelIterator + Debug, ID, F> Debug for TryFold<I, U, ID, F> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("TryFold").field("base", &self.base).finish()
+    }
+}
+
+impl<U, I, ID, F> ParallelIterator for TryFold<I, U, ID, F>
+where
+    I: ParallelIterator,
+    F: Fn(U::Output, I::Item) -> U + Sync + Send,
+    ID: Fn() -> U::Output + Sync + Send,
+    U: Try + Send,
+{
+    type Item = U;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        let consumer1 = TryFoldConsumer {
+            base: consumer,
+            identity: &self.identity,
+            fold_op: &self.fold_op,
+            marker: PhantomData,
+        };
+        self.base.drive_unindexed(consumer1)
+    }
+}
+
+struct TryFoldConsumer<'c, U, C, ID, F> {
+    base: C,
+    identity: &'c ID,
+    fold_op: &'c F,
+    marker: PhantomData<U>,
+}
+
+impl<'r, U, T, C, ID, F> Consumer<T> for TryFoldConsumer<'r, U, C, ID, F>
+where
+    C: Consumer<U>,
+    F: Fn(U::Output, T) -> U + Sync,
+    ID: Fn() -> U::Output + Sync,
+    U: Try + Send,
+{
+    type Folder = TryFoldFolder<'r, C::Folder, U, F>;
+    type Reducer = C::Reducer;
+    type Result = C::Result;
+
+    fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) {
+        let (left, right, reducer) = self.base.split_at(index);
+        (
+            TryFoldConsumer { base: left, ..self },
+            TryFoldConsumer {
+                base: right,
+                ..self
+            },
+            reducer,
+        )
+    }
+
+    fn into_folder(self) -> Self::Folder {
+        TryFoldFolder {
+            base: self.base.into_folder(),
+            control: Continue((self.identity)()),
+            fold_op: self.fold_op,
+        }
+    }
+
+    fn full(&self) -> bool {
+        self.base.full()
+    }
+}
+
+impl<'r, U, T, C, ID, F> UnindexedConsumer<T> for TryFoldConsumer<'r, U, C, ID, F>
+where
+    C: UnindexedConsumer<U>,
+    F: Fn(U::Output, T) -> U + Sync,
+    ID: Fn() -> U::Output + Sync,
+    U: Try + Send,
+{
+    fn split_off_left(&self) -> Self {
+        TryFoldConsumer {
+            base: self.base.split_off_left(),
+            ..*self
+        }
+    }
+
+    fn to_reducer(&self) -> Self::Reducer {
+        self.base.to_reducer()
+    }
+}
+
+struct TryFoldFolder<'r, C, U: Try, F> {
+    base: C,
+    fold_op: &'r F,
+    control: ControlFlow<U::Residual, U::Output>,
+}
+
+impl<'r, C, U, F, T> Folder<T> for TryFoldFolder<'r, C, U, F>
+where
+    C: Folder<U>,
+    F: Fn(U::Output, T) -> U + Sync,
+    U: Try,
+{
+    type Result = C::Result;
+
+    fn consume(mut self, item: T) -> Self {
+        let fold_op = self.fold_op;
+        if let Continue(acc) = self.control {
+            self.control = fold_op(acc, item).branch();
+        }
+        self
+    }
+
+    fn complete(self) -> C::Result {
+        let item = match self.control {
+            Continue(c) => U::from_output(c),
+            Break(r) => U::from_residual(r),
+        };
+        self.base.consume(item).complete()
+    }
+
+    fn full(&self) -> bool {
+        match self.control {
+            Break(_) => true,
+            _ => self.base.full(),
+        }
+    }
+}
+
+// ///////////////////////////////////////////////////////////////////////////
+
+impl<U, I, F> TryFoldWith<I, U, F>
+where
+    I: ParallelIterator,
+    F: Fn(U::Output, I::Item) -> U + Sync,
+    U: Try + Send,
+    U::Output: Clone + Send,
+{
+    pub(super) fn new(base: I, item: U::Output, fold_op: F) -> Self {
+        TryFoldWith {
+            base,
+            item,
+            fold_op,
+        }
+    }
+}
+
+/// `TryFoldWith` is an iterator that applies a function over an iterator producing a single value.
+/// This struct is created by the [`try_fold_with()`] method on [`ParallelIterator`]
+///
+/// [`try_fold_with()`]: trait.ParallelIterator.html#method.try_fold_with
+/// [`ParallelIterator`]: trait.ParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Clone)]
+pub struct TryFoldWith<I, U: Try, F> {
+    base: I,
+    item: U::Output,
+    fold_op: F,
+}
+
+impl<I: ParallelIterator + Debug, U: Try, F> Debug for TryFoldWith<I, U, F>
+where
+    U::Output: Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("TryFoldWith")
+            .field("base", &self.base)
+            .field("item", &self.item)
+            .finish()
+    }
+}
+
+impl<U, I, F> ParallelIterator for TryFoldWith<I, U, F>
+where
+    I: ParallelIterator,
+    F: Fn(U::Output, I::Item) -> U + Sync + Send,
+    U: Try + Send,
+    U::Output: Clone + Send,
+{
+    type Item = U;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        let consumer1 = TryFoldWithConsumer {
+            base: consumer,
+            item: self.item,
+            fold_op: &self.fold_op,
+        };
+        self.base.drive_unindexed(consumer1)
+    }
+}
+
+struct TryFoldWithConsumer<'c, C, U: Try, F> {
+    base: C,
+    item: U::Output,
+    fold_op: &'c F,
+}
+
+impl<'r, U, T, C, F> Consumer<T> for TryFoldWithConsumer<'r, C, U, F>
+where
+    C: Consumer<U>,
+    F: Fn(U::Output, T) -> U + Sync,
+    U: Try + Send,
+    U::Output: Clone + Send,
+{
+    type Folder = TryFoldFolder<'r, C::Folder, U, F>;
+    type Reducer = C::Reducer;
+    type Result = C::Result;
+
+    fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) {
+        let (left, right, reducer) = self.base.split_at(index);
+        (
+            TryFoldWithConsumer {
+                base: left,
+                item: self.item.clone(),
+                ..self
+            },
+            TryFoldWithConsumer {
+                base: right,
+                ..self
+            },
+            reducer,
+        )
+    }
+
+    fn into_folder(self) -> Self::Folder {
+        TryFoldFolder {
+            base: self.base.into_folder(),
+            control: Continue(self.item),
+            fold_op: self.fold_op,
+        }
+    }
+
+    fn full(&self) -> bool {
+        self.base.full()
+    }
+}
+
+impl<'r, U, T, C, F> UnindexedConsumer<T> for TryFoldWithConsumer<'r, C, U, F>
+where
+    C: UnindexedConsumer<U>,
+    F: Fn(U::Output, T) -> U + Sync,
+    U: Try + Send,
+    U::Output: Clone + Send,
+{
+    fn split_off_left(&self) -> Self {
+        TryFoldWithConsumer {
+            base: self.base.split_off_left(),
+            item: self.item.clone(),
+            ..*self
+        }
+    }
+
+    fn to_reducer(&self) -> Self::Reducer {
+        self.base.to_reducer()
+    }
+}