---

yaml
---
r: 83966
b: refs/heads/dist-snap
c: 0ff5c17
h: refs/heads/master
v: v3

Author: blake2-ppc

[refs]

@@ -6,7 +6,7 @@ refs/heads/try: 0983ebe5310d4eb6d289f636f7ed0536c08bbc0e
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
 refs/heads/try2: 147ecfdd8221e4a4d4e090486829a06da1e0ca3c
-refs/heads/dist-snap: 8a3267672c43e7cc116e588dd21998d14fc21ba4
+refs/heads/dist-snap: 0ff5c17cbbef0aedfa2eb1142cbf7a87abfd1d05
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/heads/try3: 9387340aab40a73e8424c48fd42f0c521a4875c0

branches/dist-snap/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();