Merge #18

18:  Add AsMut and AsRef implementations for Vec and String  r=japaric a=glandium

And a cleanup commit removing unused `#![features]`

src/lib.rs

@@ -92,9 +92,7 @@
 #![deny(missing_docs)]
 #![deny(warnings)]
 #![feature(const_fn)]
-#![feature(const_unsafe_cell_new)]
 #![feature(core_intrinsics)]
-#![feature(shared)]
 #![feature(unsize)]
 #![no_std]
 

src/string.rs

@@ -426,6 +426,26 @@ where
     }
 }
 
+impl<A> AsRef<str> for String<A>
+where
+    A: Unsize<[u8]>,
+{
+    #[inline]
+    fn as_ref(&self) -> &str {
+        self
+    }
+}
+
+impl<A> AsRef<[u8]> for String<A>
+where
+    A: Unsize<[u8]>,
+{
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        self.as_bytes()
+    }
+}
+
 impl<A, B> PartialEq<String<B>> for String<A>
 where
     A: Unsize<[u8]>,

src/vec.rs

@@ -243,6 +243,46 @@ where
     }
 }
 
+impl<T, A> AsRef<Vec<T, A>> for Vec<T, A>
+where
+    A: Unsize<[T]>,
+{
+    #[inline]
+    fn as_ref(&self) -> &Vec<T, A> {
+        self
+    }
+}
+
+impl<T, A> AsMut<Vec<T, A>> for Vec<T, A>
+where
+    A: Unsize<[T]>,
+{
+    #[inline]
+    fn as_mut(&mut self) -> &mut Vec<T, A> {
+        self
+    }
+}
+
+impl<T, A> AsRef<[T]> for Vec<T, A>
+where
+    A: Unsize<[T]>,
+{
+    #[inline]
+    fn as_ref(&self) -> &[T] {
+        self
+    }
+}
+
+impl<T, A> AsMut<[T]> for Vec<T, A>
+where
+    A: Unsize<[T]>,
+{
+    #[inline]
+    fn as_mut(&mut self) -> &mut [T] {
+        self
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use Vec;