From 9de32721749b635ff3e04e690da89cf06602c122 Mon Sep 17 00:00:00 2001
From: Kohei Takahashi <flast@flast.jp>
Date: Tue, 6 Mar 2018 00:40:41 +0900
Subject: [PATCH] Added workaround for GCC 4.4/c++0x

Teh call of ctor is ambiguous since gcc 4.4 allows binding rvalue to lvalue reference.
---
 .../fusion/container/deque/detail/keyed_element.hpp  | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/boost/fusion/container/deque/detail/keyed_element.hpp b/include/boost/fusion/container/deque/detail/keyed_element.hpp
index 15b68667..3ab88b92 100644
--- a/include/boost/fusion/container/deque/detail/keyed_element.hpp
+++ b/include/boost/fusion/container/deque/detail/keyed_element.hpp
@@ -13,6 +13,11 @@
 #include <boost/fusion/iterator/deref.hpp>
 #include <boost/fusion/iterator/next.hpp>
 
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
+#include <boost/core/enable_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#endif
+
 namespace boost { namespace fusion
 {
     struct fusion_sequence_tag;
@@ -114,8 +119,13 @@ namespace boost { namespace fusion { namespace detail
         {}
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if BOOST_WORKAROUND(BOOST_GCC, / 100 == 404)
+        template <typename Value_, typename = typename enable_if<is_same<Value_, Value> >::type>
+#else
+        typedef Value Value_;
+#endif
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        keyed_element(Value&& value, Rest&& rest)
+        keyed_element(Value_&& value, Rest&& rest)
             : Rest(std::move(rest))
             , value_(BOOST_FUSION_FWD_ELEM(Value, value))
         {}