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    //! This module contains the parallel iterator types for double-ended queues
    //! (`VecDeque<T>`). You will rarely need to interact with it directly
    //! unless you have need to name one of the iterator types.

    use std::collections::VecDeque;

    use iter::plumbing::*;
    use iter::*;

    use slice;
    use vec;

    /// Parallel iterator over a double-ended queue
    #[derive(Debug, Clone)]
    pub struct IntoIter<T: Send> {
        inner: vec::IntoIter<T>,
    }

    into_par_vec! {
        VecDeque<T> => IntoIter<T>,
        impl<T: Send>
    }

    delegate_indexed_iterator! {
        IntoIter<T> => T,
        impl<T: Send>
    }

    /// Parallel iterator over an immutable reference to a double-ended queue
    #[derive(Debug)]
    pub struct Iter<'a, T: Sync + 'a> {
        inner: Chain<slice::Iter<'a, T>, slice::Iter<'a, T>>,
    }

    impl<'a, T: Sync> Clone for Iter<'a, T> {
        fn clone(&self) -> Self {
            Iter {
                inner: self.inner.clone(),
            }
        }
    }

    impl<'a, T: Sync> IntoParallelIterator for &'a VecDeque<T> {
        type Item = &'a T;
        type Iter = Iter<'a, T>;

        fn into_par_iter(self) -> Self::Iter {
            let (a, b) = self.as_slices();
            Iter {
                inner: a.into_par_iter().chain(b),
            }
        }
    }

    delegate_indexed_iterator! {
        Iter<'a, T> => &'a T,
        impl<'a, T: Sync + 'a>
    }

    /// Parallel iterator over a mutable reference to a double-ended queue
    #[derive(Debug)]
    pub struct IterMut<'a, T: Send + 'a> {
        inner: Chain<slice::IterMut<'a, T>, slice::IterMut<'a, T>>,
    }

    impl<'a, T: Send> IntoParallelIterator for &'a mut VecDeque<T> {
        type Item = &'a mut T;
        type Iter = IterMut<'a, T>;

        fn into_par_iter(self) -> Self::Iter {
            let (a, b) = self.as_mut_slices();
            IterMut {
                inner: a.into_par_iter().chain(b),
            }
        }
    }

    delegate_indexed_iterator! {
        IterMut<'a, T> => &'a mut T,
        impl<'a, T: Send + 'a>
    }

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