From ac0cc94982bb81e42fe56a82ae551a6ad8cd4670 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Fri, 8 Dec 2017 20:01:39 +0000
Subject: [PATCH] Config.MSVC-15.5: BOOST_NO_CXX11_SFINAE_EXPR no longer
 required in C++14 or later mode.

---
 include/boost/config/compiler/visualc.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/config/compiler/visualc.hpp b/include/boost/config/compiler/visualc.hpp
index d23af835..49bb1a48 100644
--- a/include/boost/config/compiler/visualc.hpp
+++ b/include/boost/config/compiler/visualc.hpp
@@ -222,7 +222,9 @@
 // C++ 11:
 //
 #define BOOST_NO_TWO_PHASE_NAME_LOOKUP
+#if (_MSC_VER < 1912) || (_MSVC_LANG < 201402)
 #define BOOST_NO_CXX11_SFINAE_EXPR
+#endif
 // C++ 14:
 #  define BOOST_NO_CXX14_CONSTEXPR
 // C++ 17: