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    use crate::Buf;

    /// Iterator over the bytes contained by the buffer.
    ///
    /// This struct is created by the [`iter`] method on [`Buf`].
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use bytes::Bytes;
    ///
    /// let buf = Bytes::from(&b"abc"[..]);
    /// let mut iter = buf.into_iter();
    ///
    /// assert_eq!(iter.next(), Some(b'a'));
    /// assert_eq!(iter.next(), Some(b'b'));
    /// assert_eq!(iter.next(), Some(b'c'));
    /// assert_eq!(iter.next(), None);
    /// ```
    ///
    /// [`iter`]: trait.Buf.html#method.iter
    /// [`Buf`]: trait.Buf.html
    #[derive(Debug)]
    pub struct IntoIter<T> {
        inner: T,
    }

    impl<T> IntoIter<T> {
        /// Creates an iterator over the bytes contained by the buffer.
        ///
        /// # Examples
        ///
        /// ```
        /// use bytes::Bytes;
        ///
        /// let buf = Bytes::from_static(b"abc");
        /// let mut iter = buf.into_iter();
        ///
        /// assert_eq!(iter.next(), Some(b'a'));
        /// assert_eq!(iter.next(), Some(b'b'));
        /// assert_eq!(iter.next(), Some(b'c'));
        /// assert_eq!(iter.next(), None);
        /// ```
        pub(crate) fn new(inner: T) -> IntoIter<T> {
            IntoIter { inner }
        }

        /// Consumes this `IntoIter`, returning the underlying value.
        ///
        /// # Examples
        ///
        /// ```rust
        /// use bytes::{Buf, Bytes};
        ///
        /// let buf = Bytes::from(&b"abc"[..]);
        /// let mut iter = buf.into_iter();
        ///
        /// assert_eq!(iter.next(), Some(b'a'));
        ///
        /// let buf = iter.into_inner();
        /// assert_eq!(2, buf.remaining());
        /// ```
        pub fn into_inner(self) -> T {
            self.inner
        }

        /// Gets a reference to the underlying `Buf`.
        ///
        /// It is inadvisable to directly read from the underlying `Buf`.
        ///
        /// # Examples
        ///
        /// ```rust
        /// use bytes::{Buf, Bytes};
        ///
        /// let buf = Bytes::from(&b"abc"[..]);
        /// let mut iter = buf.into_iter();
        ///
        /// assert_eq!(iter.next(), Some(b'a'));
        ///
        /// assert_eq!(2, iter.get_ref().remaining());
        /// ```
        pub fn get_ref(&self) -> &T {
            &self.inner
        }

        /// Gets a mutable reference to the underlying `Buf`.
        ///
        /// It is inadvisable to directly read from the underlying `Buf`.
        ///
        /// # Examples
        ///
        /// ```rust
        /// use bytes::{Buf, BytesMut};
        ///
        /// let buf = BytesMut::from(&b"abc"[..]);
        /// let mut iter = buf.into_iter();
        ///
        /// assert_eq!(iter.next(), Some(b'a'));
        ///
        /// iter.get_mut().advance(1);
        ///
        /// assert_eq!(iter.next(), Some(b'c'));
        /// ```
        pub fn get_mut(&mut self) -> &mut T {
            &mut self.inner
        }
    }

    impl<T: Buf> Iterator for IntoIter<T> {
        type Item = u8;

        fn next(&mut self) -> Option<u8> {
            if !self.inner.has_remaining() {
                return None;
            }

            let b = self.inner.chunk()[0];
            self.inner.advance(1);

            Some(b)
        }

        fn size_hint(&self) -> (usize, Option<usize>) {
            let rem = self.inner.remaining();
            (rem, Some(rem))
        }
    }

    impl<T: Buf> ExactSizeIterator for IntoIter<T> {}