---

yaml
---
r: 64214
b: refs/heads/snap-stage3
c: 6a95e49
h: refs/heads/master
v: v3

Author: blake2-ppc

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 2d28d645422c1617be58c8ca7ad9a457264ca850
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 92842d6516d2c5d92bad553585340f2ae3284308
+refs/heads/snap-stage3: 6a95e49fc5bad1367f597bf0eeab7197c9ca226a
 refs/heads/try: 7b78b52e602bb3ea8174f9b2006bff3315f03ef9
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/libextra/container.rs

@@ -0,0 +1,40 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Container traits for extra
+
+use std::container::Mutable;
+
+/// A double-ended sequence that allows querying, insertion and deletion at both ends.
+pub trait Deque<T> : Mutable {
+    /// Provide a reference to the front element, or None if the sequence is empty
+    fn front<'a>(&'a self) -> Option<&'a T>;
+
+    /// Provide a mutable reference to the front element, or None if the sequence is empty
+    fn front_mut<'a>(&'a mut self) -> Option<&'a mut T>;
+
+    /// Provide a reference to the back element, or None if the sequence is empty
+    fn back<'a>(&'a self) -> Option<&'a T>;
+
+    /// Provide a mutable reference to the back element, or None if the sequence is empty
+    fn back_mut<'a>(&'a mut self) -> Option<&'a mut T>;
+
+    /// Insert an element first in the sequence
+    fn push_front(&mut self, elt: T);
+
+    /// Insert an element last in the sequence
+    fn push_back(&mut self, elt: T);
+
+    /// Remove the last element and return it, or None if the sequence is empty
+    fn pop_back(&mut self) -> Option<T>;
+
+    /// Remove the first element and return it, or None if the sequence is empty
+    fn pop_front(&mut self) -> Option<T>;
+}

branches/snap-stage3/src/libextra/extra.rs

@@ -67,6 +67,7 @@ pub mod flatpipes;
 
 // Collections
 
+pub mod container;
 pub mod bitv;
 pub mod deque;
 pub mod fun_treemap;