into_iter.rs - source
Description: Source of the Rust file `library/alloc/src/collections/vec_deque/into_iter.rs`.
Keywords: rust, rustlang, rust-lang

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    use core::fmt;
    use core::iter::FusedIterator;

    use super::VecDeque;

    /// An owning iterator over the elements of a `VecDeque`.
    ///
    /// This `struct` is created by the [`into_iter`] method on [`VecDeque`]
    /// (provided by the `IntoIterator` trait). See its documentation for more.
    ///
    /// [`into_iter`]: VecDeque::into_iter
    #[derive(Clone)]
    #[stable(feature = "rust1", since = "1.0.0")]
    pub struct IntoIter<T> {
        pub(crate) inner: VecDeque<T>,
    }

    #[stable(feature = "collection_debug", since = "1.17.0")]
    impl<T: fmt::Debug> fmt::Debug for IntoIter<T> {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.debug_tuple("IntoIter").field(&self.inner).finish()
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl<T> Iterator for IntoIter<T> {
        type Item = T;

        #[inline]
        fn next(&mut self) -> Option<T> {
            self.inner.pop_front()
        }

        #[inline]
        fn size_hint(&self) -> (usize, Option<usize>) {
            let len = self.inner.len();
            (len, Some(len))
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl<T> DoubleEndedIterator for IntoIter<T> {
        #[inline]
        fn next_back(&mut self) -> Option<T> {
            self.inner.pop_back()
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl<T> ExactSizeIterator for IntoIter<T> {
        fn is_empty(&self) -> bool {
            self.inner.is_empty()
        }
    }

    #[stable(feature = "fused", since = "1.26.0")]
    impl<T> FusedIterator for IntoIter<T> {}