---

yaml
---
r: 64039
b: refs/heads/snap-stage3
c: 0ff5c17
h: refs/heads/master
i:
  64037: 4493277
  64035: e67bce0
  64031: cb4bed2
v: v3

Author: blake2-ppc

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 2d28d645422c1617be58c8ca7ad9a457264ca850
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 8a3267672c43e7cc116e588dd21998d14fc21ba4
+refs/heads/snap-stage3: 0ff5c17cbbef0aedfa2eb1142cbf7a87abfd1d05
 refs/heads/try: 7b78b52e602bb3ea8174f9b2006bff3315f03ef9
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

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

@@ -14,7 +14,8 @@ use std::uint;
 use std::vec;
 use std::iterator::FromIterator;
 
-static INITIAL_CAPACITY: uint = 32u; // 2^5
+static INITIAL_CAPACITY: uint = 8u; // 2^3
+static MINIMUM_CAPACITY: uint = 2u;
 
 #[allow(missing_doc)]
 pub struct Deque<T> {
@@ -43,8 +44,13 @@ impl<T> Mutable for Deque<T> {
 impl<T> Deque<T> {
     /// Create an empty Deque
     pub fn new() -> Deque<T> {
+        Deque::with_capacity(INITIAL_CAPACITY)
+    }
+
+    /// Create an empty Deque with space for at least `n` elements.
+    pub fn with_capacity(n: uint) -> Deque<T> {
         Deque{nelts: 0, lo: 0,
-              elts: vec::from_fn(INITIAL_CAPACITY, |_| None)}
+              elts: vec::from_fn(uint::max(MINIMUM_CAPACITY, n), |_| None)}
     }
 
     /// Return a reference to the first element in the deque
@@ -527,6 +533,16 @@ mod tests {
 
     }
 
+    #[test]
+    fn test_with_capacity() {
+        let mut d = Deque::with_capacity(0);
+        d.add_back(1);
+        assert_eq!(d.len(), 1);
+        let mut d = Deque::with_capacity(50);
+        d.add_back(1);
+        assert_eq!(d.len(), 1);
+    }
+
     #[test]
     fn test_reserve() {
         let mut d = Deque::new();