Add methods to access a DVec<N> as a &[N].

src/structs/dvec.rs

@@ -92,6 +92,20 @@ impl<N> DVec<N> {
         *self.at.unsafe_mut_ref(i) = val
     }
 
+    #[inline]
+    pub fn as_vec<'r>(&'r self) -> &'r [N] {
+        let data: &'r [N] = self.at;
+
+        data
+    }
+
+    #[inline]
+    pub fn as_mut_vec<'r>(&'r mut self) -> &'r mut [N] {
+        let data: &'r mut [N] = self.at;
+
+        data
+    }
+
     #[inline]
     pub fn to_vec(self) -> ~[N] {
         self.at