impl AsRef, AsRefMut, Borrow, BorrowMut

src/lib.rs

@@ -90,6 +90,7 @@ version = "0.2.1"
 */
 
 use std::{
+    borrow::{Borrow, BorrowMut},
     cmp::{Eq, PartialEq},
     fmt,
     hash::{Hash, Hasher},
@@ -368,6 +369,30 @@ impl<T> DerefMut for VecShard<T> {
     }
 }
 
+impl<T> AsRef<[T]> for VecShard<T> {
+    fn as_ref(&self) -> &[T] {
+        &*self
+    }
+}
+
+impl<T> AsMut<[T]> for VecShard<T> {
+    fn as_mut(&mut self) -> &mut [T] {
+        &mut *self
+    }
+}
+
+impl<T> Borrow<[T]> for VecShard<T> {
+    fn borrow(&self) -> &[T] {
+        &*self
+    }
+}
+
+impl<T> BorrowMut<[T]> for VecShard<T> {
+    fn borrow_mut(&mut self) -> &mut [T] {
+        &mut *self
+    }
+}
+
 impl<T, I: SliceIndex<[T]>> Index<I> for VecShard<T> {
     type Output = <I as slice::SliceIndex<[T]>>::Output;
 

tests/basic.rs

@@ -257,6 +257,23 @@ fn lens_match_up() {
     }
 }
 
+#[test]
+fn borrow_schmorrow() {
+    use std::borrow::{Borrow, BorrowMut};
+
+    let mut s = VecShard::from(vec!["sag", "ich", "immer"]);
+    fn cast_schmast<T>(r: &[T]) -> (usize, usize) {
+        (r.as_ptr() as usize, r.len())
+    }
+
+    assert_eq!(cast_schmast(&*s), cast_schmast(&mut *s));
+    assert_eq!(cast_schmast(&*s), cast_schmast(&s[..]));
+    assert_eq!(cast_schmast(&*s), cast_schmast(s.as_ref()));
+    assert_eq!(cast_schmast(&*s), cast_schmast(s.as_mut()));
+    assert_eq!(cast_schmast(&*s), cast_schmast(s.borrow()));
+    assert_eq!(cast_schmast(&*s), cast_schmast(s.borrow_mut()));
+}
+
 #[test]
 fn zst_elements() {
     let (mut left, mut right) = vec![(); 30].split_inplace_at(15);