From 85175d639f0b40062d2741f4918df48aee3ef758 Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Sun, 12 Feb 2012 02:44:40 -0800
Subject: [PATCH] core: Add iter::reverse

---
 src/libcore/iter.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index 23779e04487..8500ce7a783 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -77,6 +77,11 @@ fn to_list<A:copy,IA:iterable<A>>(self: IA) -> [A] {
     foldl::<A,[A],IA>(self, [], {|r, a| r + [a]})
 }
 
+// FIXME: This could be made more efficient with an riterable interface
+fn reverse<A:copy,IA:iterable<A>>(self: IA, blk: fn(A)) {
+    vec::riter(to_list(self), blk)
+}
+
 fn repeat(times: uint, blk: fn()) {
     let i = 0u;
     while i < times {
@@ -214,3 +219,8 @@ fn test_max() {
 fn test_max_empty() {
     max::<int, [int]>([]);
 }
+
+#[test]
+fn test_reverse() {
+    assert to_list(bind reverse([1, 2, 3], _)) == [3, 2, 1];
+}
\ No newline at end of file