/// a.rotate(k);
/// assert_eq!(&a, &[1, 2, 3, 4, 5, 6, 7]);
///
- /// fn extend_at<T, I>(v: &mut Vec<T>, index: usize, iter: I)
- /// where I: Iterator<Item=T>
- /// {
- /// let mid = v.len() - index;
- /// v.extend(iter);
- /// v[index..].rotate(mid);
+ /// use std::ops::Range;
+ /// fn slide<T>(slice: &mut [T], range: Range<usize>, to: usize) {
+ /// if to < range.start {
+ /// slice[to..range.end].rotate(range.start-to);
+ /// } else if to > range.end {
+ /// slice[range.start..to].rotate(range.end-range.start);
+ /// }
/// }
- /// let mut v = (0..10).collect();
- /// extend_at(&mut v, 7, 100..104);
- /// assert_eq!(&v, &[0, 1, 2, 3, 4, 5, 6, 100, 101, 102, 103, 7, 8, 9]);
+ /// let mut v: Vec<_> = (0..10).collect();
+ /// slide(&mut v, 1..4, 7);
+ /// assert_eq!(&v, &[0, 4, 5, 6, 1, 2, 3, 7, 8, 9]);
+ /// slide(&mut v, 6..8, 1);
+ /// assert_eq!(&v, &[0, 3, 7, 4, 5, 6, 1, 2, 8, 9]);
/// ```
#[unstable(feature = "slice_rotate", issue = "123456789")]
pub fn rotate(&mut self, mid: usize) -> usize {