From bdc1b7a8a71b0168a26e1f897246abc6c6ab1091 Mon Sep 17 00:00:00 2001
From: Erick Tryzelaar <erick.tryzelaar@gmail.com>
Date: Tue, 9 Oct 2012 08:36:06 -0700
Subject: [PATCH] libcore: add a str::with_capacity to match the fn in vec

---
 src/libcore/str.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libcore/str.rs b/src/libcore/str.rs
index d743f0c7f3be1..33016bf9923e8 100644
--- a/src/libcore/str.rs
+++ b/src/libcore/str.rs
@@ -1473,6 +1473,11 @@ pub pure fn from_utf16(v: &[u16]) -> ~str {
     move buf
 }
 
+pub pure fn with_capacity(capacity: uint) -> ~str {
+    let mut buf = ~"";
+    unsafe { reserve(&mut buf, capacity); }
+    move buf
+}
 
 /**
  * As char_len but for a slice of a string