From 8b80a1187764c07138e3feba524f8aa3658bd443 Mon Sep 17 00:00:00 2001
From: Joel de Guzman <djowel@gmail.com>
Date: Fri, 12 Aug 2011 07:24:00 +0000
Subject: [PATCH] revert to prior (again).

[SVN r73692]
---
 .../algorithm/transformation/pop_back.hpp     | 29 +++++++------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/include/boost/fusion/algorithm/transformation/pop_back.hpp b/include/boost/fusion/algorithm/transformation/pop_back.hpp
index 08bc4c8d..6eb743fd 100644
--- a/include/boost/fusion/algorithm/transformation/pop_back.hpp
+++ b/include/boost/fusion/algorithm/transformation/pop_back.hpp
@@ -1,7 +1,7 @@
 /*=============================================================================
-    Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2001-2006 Joel de Guzman
 
-    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    Distributed under the Boost Software License, Version 1.0. (See accompanying 
     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 ==============================================================================*/
 #if !defined(FUSION_POP_BACK_09172005_1038)
@@ -10,9 +10,7 @@
 #include <boost/fusion/view/iterator_range/iterator_range.hpp>
 #include <boost/fusion/sequence/intrinsic/begin.hpp>
 #include <boost/fusion/sequence/intrinsic/end.hpp>
-#include <boost/fusion/sequence/intrinsic/size.hpp>
-#include <boost/fusion/sequence/intrinsic/empty.hpp>
-#include <boost/fusion/iterator/advance.hpp>
+#include <boost/fusion/iterator/prior.hpp>
 
 namespace boost { namespace fusion
 {
@@ -21,14 +19,13 @@ namespace boost { namespace fusion
         template <typename Sequence>
         struct pop_back
         {
-            static int const size = size<Sequence>::value;
-            BOOST_STATIC_ASSERT(size > 0);
-            typedef typename begin<Sequence>::type begin_type;
-            typedef mpl::int_<size-1> end_index;
-            typedef typename advance<begin_type, end_index>::type end_type;
-
-            typedef
-                iterator_range<begin_type, end_type>
+            typedef 
+                iterator_range<
+                    typename begin<Sequence>::type
+                  , typename prior<
+                        typename end<Sequence>::type
+                    >::type
+                > 
             type;
         };
     }
@@ -37,12 +34,8 @@ namespace boost { namespace fusion
     inline typename result_of::pop_back<Sequence const>::type
     pop_back(Sequence const& seq)
     {
-        typedef typename
-            result_of::pop_back<Sequence const>::end_index
-        end_index;
-
         typedef typename result_of::pop_back<Sequence const>::type result;
-        return result(fusion::begin(seq), fusion::advance<end_index>(fusion::begin(seq)));
+        return result(fusion::begin(seq), fusion::prior(fusion::end(seq)));
     }
 }}