From a7e9bb2df4290207baa7bfd5b0ec1cc01017bdd1 Mon Sep 17 00:00:00 2001
From: Kohei Takahashi <flast@flast.jp>
Date: Sun, 26 Oct 2014 18:20:45 +0900
Subject: [PATCH] Fix to meet constexpr requirements

---
 include/boost/fusion/iterator/basic_iterator.hpp      |  2 +-
 .../sequence/intrinsic/detail/segmented_end_impl.hpp  | 11 +++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/boost/fusion/iterator/basic_iterator.hpp b/include/boost/fusion/iterator/basic_iterator.hpp
index 0630c05e..5d484132 100644
--- a/include/boost/fusion/iterator/basic_iterator.hpp
+++ b/include/boost/fusion/iterator/basic_iterator.hpp
@@ -132,7 +132,7 @@ namespace boost { namespace fusion
         {}
 
         template<typename OtherSeq>
-        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
         basic_iterator&
         operator=(basic_iterator<Tag,Category,OtherSeq,Index> const& it)
         {
diff --git a/include/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp b/include/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp
index 619fb3f2..da48649a 100644
--- a/include/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp
+++ b/include/boost/fusion/sequence/intrinsic/detail/segmented_end_impl.hpp
@@ -48,11 +48,18 @@ namespace boost { namespace fusion { namespace detail
         typedef iterator_range<end_type, end_type>  pair_type;
         typedef cons<pair_type, Stack>              type;
 
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        static pair_type make_pair(end_type end)
+        {
+            return pair_type(end, end);
+        }
+
         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
         static type call(Sequence & seq, Stack stack)
         {
-            end_type end = fusion::end(fusion::segments(seq));
-            return type(pair_type(end, end), stack);
+            return type(
+                make_pair(fusion::end(fusion::segments(seq))),
+                stack);
         }
     };