From 099333b61d800af122662677c95d3d04759b5a9a Mon Sep 17 00:00:00 2001
From: Nikita Kniazev <nok.raven@gmail.com>
Date: Wed, 13 Dec 2017 23:36:08 +0300
Subject: [PATCH] map: Switch to SFINAE in template parameters

Fixes #163.

Since C++11 we can do SFINAE in template parameters. VS2017 15.5 doesn't like
the SFINAE on argument here, but do not ask me why, because I have no idea.
---
 include/boost/fusion/container/map/map.hpp | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/include/boost/fusion/container/map/map.hpp b/include/boost/fusion/container/map/map.hpp
index ec9e58d3..6704dbe4 100644
--- a/include/boost/fusion/container/map/map.hpp
+++ b/include/boost/fusion/container/map/map.hpp
@@ -67,24 +67,21 @@ namespace boost { namespace fusion
           : base_type(std::forward<map>(seq))
         {}
 
-        template <typename Sequence>
+        template <typename Sequence, typename = typename enable_if<traits::is_sequence<Sequence>>::type>
         BOOST_FUSION_GPU_ENABLED
-        map(Sequence const& seq
-          , typename enable_if<traits::is_sequence<Sequence>, detail::enabler_>::type = detail::enabler)
+        map(Sequence const& seq)
           : base_type(begin(seq), detail::map_impl_from_iterator())
         {}
 
-        template <typename Sequence>
+        template <typename Sequence, typename = typename enable_if<traits::is_sequence<Sequence>>::type>
         BOOST_FUSION_GPU_ENABLED
-        map(Sequence& seq
-          , typename enable_if<traits::is_sequence<Sequence>, detail::enabler_>::type = detail::enabler)
+        map(Sequence& seq)
           : base_type(begin(seq), detail::map_impl_from_iterator())
         {}
 
-        template <typename Sequence>
+        template <typename Sequence, typename = typename enable_if<traits::is_sequence<Sequence>>::type>
         BOOST_FUSION_GPU_ENABLED
-        map(Sequence&& seq
-          , typename enable_if<traits::is_sequence<Sequence>, detail::enabler_>::type = detail::enabler)
+        map(Sequence&& seq)
           : base_type(begin(seq), detail::map_impl_from_iterator())
         {}