From 81d75f1b5679dd94d912675a7951402714cc1169 Mon Sep 17 00:00:00 2001
From: Chris Glover <c.d.glover@gmail.com>
Date: Thu, 18 Feb 2016 22:54:10 -0500
Subject: [PATCH] Add a check for begin == end to allow users to supply an
 empty list to lockfree::stack::push

---
 include/boost/lockfree/stack.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/lockfree/stack.hpp b/include/boost/lockfree/stack.hpp
index 6db986c..455a772 100644
--- a/include/boost/lockfree/stack.hpp
+++ b/include/boost/lockfree/stack.hpp
@@ -243,6 +243,11 @@ class stack
     template <bool Threadsafe, bool Bounded, typename ConstIterator>
     tuple<node*, node*> prepare_node_list(ConstIterator begin, ConstIterator end, ConstIterator & ret)
     {
+        if (begin == end) {
+            ret = begin;
+            return make_tuple<node*, node*>(NULL, NULL);
+        }
+
         ConstIterator it = begin;
         node * end_node = pool.template construct<Threadsafe, Bounded>(*it++);
         if (end_node == NULL) {