From c34de59f3ee1113a24820e645d4a969150eb18aa Mon Sep 17 00:00:00 2001
From: Andy Gross <andy@andygross.org>
Date: Thu, 16 Aug 2012 00:40:51 -0700
Subject: [PATCH] make len_ mutable

---
 c_src/lockfree_queue.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/c_src/lockfree_queue.hpp b/c_src/lockfree_queue.hpp
index 9d08d75..a8faa0d 100644
--- a/c_src/lockfree_queue.hpp
+++ b/c_src/lockfree_queue.hpp
@@ -128,5 +128,5 @@ class lockfree_queue
 private:
     node *first_;
     atomic_node_pointer divider_, last_;
-    std::size_t len_;
+    mutable std::size_t len_;
 };