From ad98e210c65e8a129b185b38fa6e0ba33beef1dc Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Thu, 5 Mar 2015 16:07:37 +0000
Subject: [PATCH] Rework reverse_iterator::operator[] so as not to use the base
 iterators operator [], which can cause constness problems. Fixes PR17883

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@231375 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/iterator | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/iterator b/include/iterator
index 04ff4c127..7f7e9ee19 100644
--- a/include/iterator
+++ b/include/iterator
@@ -575,7 +575,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY reverse_iterator& operator-=(difference_type __n)
         {current += __n; return *this;}
     _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
-        {return current[-__n-1];}
+        {return *(*this + __n);}
 };
 
 template <class _Iter1, class _Iter2>