collections: Make push_back/pop_back default methods

src/libcollections/dlist.rs

@@ -249,29 +249,17 @@ fn push_front(&mut self, elt: T) {
     fn pop_front(&mut self) -> Option<T> {
         self.pop_front_node().map(|box Node{value, ..}| value)
     }
+}
 
-    /// Add an element last in the list
-    ///
-    /// O(1)
-    #[deprecated = "use the `push` method"]
-    fn push_back(&mut self, elt: T) {
+impl<T> MutableSeq<T> for DList<T> {
+    fn push(&mut self, elt: T) {
         self.push_back_node(box Node::new(elt))
     }
-
-    /// Remove the last element and return it, or None if the list is empty
-    ///
-    /// O(1)
-    #[deprecated = "use the `pop` method"]
-    fn pop_back(&mut self) -> Option<T> {
+    fn pop(&mut self) -> Option<T> {
         self.pop_back_node().map(|box Node{value, ..}| value)
     }
 }
 
-impl<T> MutableSeq<T> for DList<T> {
-    fn push(&mut self, elt: T) { self.push_back(elt) }
-    fn pop(&mut self) -> Option<T> { self.pop_back() }
-}
-
 impl<T> Default for DList<T> {
     #[inline]
     fn default() -> DList<T> { DList::new() }

src/libcollections/lib.rs

@@ -516,7 +516,7 @@ pub trait Deque<T> : MutableSeq<T> {
     /// assert_eq!(d.front(), Some(&1i));
     /// ```
     #[deprecated = "use the `push` method"]
-    fn push_back(&mut self, elt: T);
+    fn push_back(&mut self, elt: T) { self.push(elt) }
 
     /// Remove the last element and return it, or `None` if the sequence is empty.
     ///
@@ -534,7 +534,7 @@ pub trait Deque<T> : MutableSeq<T> {
     /// assert_eq!(d.pop_back(), None);
     /// ```
     #[deprecated = "use the `pop` method"]
-    fn pop_back(&mut self) -> Option<T>;
+    fn pop_back(&mut self) -> Option<T> { self.pop() }
 
     /// Remove the first element and return it, or `None` if the sequence is empty.
     ///

src/libcollections/ringbuf.rs

@@ -80,18 +80,6 @@ fn pop_front(&mut self) -> Option<T> {
         result
     }
 
-    /// Remove and return the last element in the RingBuf, or None if it is empty
-    #[deprecated = "use the `pop` method"]
-    fn pop_back(&mut self) -> Option<T> {
-        if self.nelts > 0 {
-            self.nelts -= 1;
-            let hi = self.raw_index(self.nelts);
-            self.elts.get_mut(hi).take()
-        } else {
-            None
-        }
-    }
-
     /// Prepend an element to the RingBuf
     fn push_front(&mut self, t: T) {
         if self.nelts == self.elts.len() {
@@ -103,10 +91,10 @@ fn push_front(&mut self, t: T) {
         *self.elts.get_mut(self.lo) = Some(t);
         self.nelts += 1u;
     }
+}
 
-    /// Append an element to the RingBuf
-    #[deprecated = "use the `push` method"]
-    fn push_back(&mut self, t: T) {
+impl<T> MutableSeq<T> for RingBuf<T> {
+    fn push(&mut self, t: T) {
         if self.nelts == self.elts.len() {
             grow(self.nelts, &mut self.lo, &mut self.elts);
         }
@@ -114,11 +102,15 @@ fn push_back(&mut self, t: T) {
         *self.elts.get_mut(hi) = Some(t);
         self.nelts += 1u;
     }
-}
-
-impl<T> MutableSeq<T> for RingBuf<T> {
-    fn push(&mut self, t: T) { self.push_back(t) }
-    fn pop(&mut self) -> Option<T> { self.pop_back() }
+    fn pop(&mut self) -> Option<T> {
+        if self.nelts > 0 {
+            self.nelts -= 1;
+            let hi = self.raw_index(self.nelts);
+            self.elts.get_mut(hi).take()
+        } else {
+            None
+        }
+    }
 }
 
 impl<T> Default for RingBuf<T> {