From 1039348f12953dc659f49266af518a8c96b49698 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 22 Nov 2019 13:49:17 +0100
Subject: [PATCH] backport is_valid_index_type fix from default branch and
 c++03

---
 Eigen/src/Core/util/XprHelper.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Eigen/src/Core/util/XprHelper.h b/Eigen/src/Core/util/XprHelper.h
index 35e476860..9215d59c9 100644
--- a/Eigen/src/Core/util/XprHelper.h
+++ b/Eigen/src/Core/util/XprHelper.h
@@ -44,7 +44,7 @@ template<typename T> struct is_valid_index_type
     internal::is_integral<T>::value || __is_enum(T)
 #else
     // without C++11, we use is_convertible to Index instead of is_integral in order to treat enums as Index.
-    internal::is_convertible<T,Index>::value
+    internal::is_convertible<T,Index>::value && !internal::is_same<T,float>::value && !is_same<T,double>::value
 #endif
   };
 };