use fmt::{self, Debug, Display};
use marker::Unsize;
use mem;
-use ops::{Deref, DerefMut, CoerceUnsized, Index};
+use ops::{Deref, DerefMut, CoerceUnsized};
use ptr;
-use slice::SliceIndex;
/// A mutable memory location.
///
/// use std::cell::Cell;
/// let slice: &mut [i32] = &mut [1,2,3];
/// let cell_slice: &Cell<[i32]> = Cell::from_mut(slice);
+ /// assert_eq!(cell_slice.len(), 3);
/// let slice_cell : &[Cell<i32>] = &cell_slice[..];
- /// assert_eq!(slice_cell.len(), 3)
+ /// assert_eq!(slice_cell.len(), 3);
/// ```
#[inline]
#[unstable(feature = "as_cell", issue="43038")]
impl<T: CoerceUnsized<U>, U> CoerceUnsized<Cell<U>> for Cell<T> {}
#[unstable(feature = "as_cell", issue="43038")]
-impl<T, I> Index<I> for Cell<[T]>
-where
- I: SliceIndex<[Cell<T>]>
-{
- type Output = I::Output;
+impl<T> Deref for Cell<[T]> {
+ type Target = [Cell<T>];
- fn index(&self, index: I) -> &Self::Output {
+ #[inline]
+ fn deref(&self) -> &[Cell<T>] {
unsafe {
- Index::index(&*(self as *const Cell<[T]> as *const [Cell<T>]), index)
+ &*(self as *const Cell<[T]> as *const [Cell<T>])
}
}
}
fn main() {
let slice: &mut [i32] = &mut [1,2,3];
let cell_slice: &Cell<[i32]> = Cell::from_mut(slice);
+ assert_eq!(cell_slice.len(), 3);
let sub_slice : &[Cell<i32>] = &cell_slice[1..];
assert_eq!(sub_slice.len(), 2);
}