From 3d946e42b314d9a80a82f5551098a99529b93fc7 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 1 Sep 2016 12:59:32 +0200
Subject: Fix compilation with visual studio

---
 Eigen/src/Core/util/Meta.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h
index 29c149c34..e5e1b760f 100755
--- a/Eigen/src/Core/util/Meta.h
+++ b/Eigen/src/Core/util/Meta.h
@@ -381,13 +381,12 @@ struct has_ReturnType
   enum { value = sizeof(testFunctor<T>(0)) == sizeof(meta_yes) };
 };
 
-template<int Size> struct meta_array { int a[Size]; };
 template<typename T> const T& return_ref();
 
 template <typename T>
 struct has_nullary_operator
 {
-  template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()()) > * = 0);
+  template <typename C> static meta_yes testFunctor(C const *,enable_if<(sizeof(return_ref<C>()())>0)> * = 0);
   static meta_no testFunctor(...);
 
   enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
@@ -396,7 +395,7 @@ struct has_nullary_operator
 template <typename T>
 struct has_unary_operator
 {
-  template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()(Index(0))) > * = 0);
+  template <typename C> static meta_yes testFunctor(C const *,enable_if<(sizeof(return_ref<C>()(Index(0)))>0)> * = 0);
   static meta_no testFunctor(...);
 
   enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
@@ -405,7 +404,7 @@ struct has_unary_operator
 template <typename T>
 struct has_binary_operator
 {
-  template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()(Index(0),Index(0))) > * = 0);
+  template <typename C> static meta_yes testFunctor(C const *,enable_if<(sizeof(return_ref<C>()(Index(0),Index(0)))>0)> * = 0);
   static meta_no testFunctor(...);
 
   enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
-- 
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