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    use super::noop::*;
    use super::plumbing::*;
    use super::ParallelIterator;

    pub(super) fn for_each<I, F, T>(pi: I, op: &F)
    where
        I: ParallelIterator<Item = T>,
        F: Fn(T) + Sync,
        T: Send,
    {
        let consumer = ForEachConsumer { op };
        pi.drive_unindexed(consumer)
    }

    struct ForEachConsumer<'f, F: 'f> {
        op: &'f F,
    }

    impl<'f, F, T> Consumer<T> for ForEachConsumer<'f, F>
    where
        F: Fn(T) + Sync,
    {
        type Folder = ForEachConsumer<'f, F>;
        type Reducer = NoopReducer;
        type Result = ();

        fn split_at(self, _index: usize) -> (Self, Self, NoopReducer) {
            (self.split_off_left(), self, NoopReducer)
        }

        fn into_folder(self) -> Self {
            self
        }

        fn full(&self) -> bool {
            false
        }
    }

    impl<'f, F, T> Folder<T> for ForEachConsumer<'f, F>
    where
        F: Fn(T) + Sync,
    {
        type Result = ();

        fn consume(self, item: T) -> Self {
            (self.op)(item);
            self
        }

        fn consume_iter<I>(self, iter: I) -> Self
        where
            I: IntoIterator<Item = T>,
        {
            iter.into_iter().fold((), |_, item| (self.op)(item));
            self
        }

        fn complete(self) {}

        fn full(&self) -> bool {
            false
        }
    }

    impl<'f, F, T> UnindexedConsumer<T> for ForEachConsumer<'f, F>
    where
        F: Fn(T) + Sync,
    {
        fn split_off_left(&self) -> Self {
            ForEachConsumer { op: self.op }
        }

        fn to_reducer(&self) -> NoopReducer {
            NoopReducer
        }
    }

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