From 6e97698161275db750868afb99f405cdb849f412 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Mon, 16 Jan 2017 16:13:37 +0100
Subject: [PATCH] Introduce a EIGEN_HAS_CXX14 macro

---
 Eigen/src/Core/util/Macros.h        | 5 +++++
 Eigen/src/Core/util/SymbolicIndex.h | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 14addd8fb..7462dc5cf 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -362,6 +362,11 @@
 #define EIGEN_HAS_CXX11 0
 #endif
 
+#if EIGEN_MAX_CPP_VER>=14 && (defined(__cplusplus) && (__cplusplus > 201103L) || EIGEN_COMP_MSVC >= 1900)
+#define EIGEN_HAS_CXX14 1
+#else
+#define EIGEN_HAS_CXX14 0
+#endif
 
 // Do we support r-value references?
 #ifndef EIGEN_HAS_RVALUE_REFERENCES
diff --git a/Eigen/src/Core/util/SymbolicIndex.h b/Eigen/src/Core/util/SymbolicIndex.h
index 03086d6fa..6f603f301 100644
--- a/Eigen/src/Core/util/SymbolicIndex.h
+++ b/Eigen/src/Core/util/SymbolicIndex.h
@@ -76,7 +76,7 @@ public:
   template<typename T>
   Index eval(const T& values) const { return derived().eval_impl(values); }
 
-#if __cplusplus > 201103L
+#if EIGEN_HAS_CXX14
   template<typename... Types>
   Index eval(Types&&... values) const { return derived().eval_impl(std::make_tuple(values...)); }
 #endif