From 607be65a03aace70d17f0b968d76986ff09acc78 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 25 Jan 2017 22:53:58 +0100
Subject: [PATCH] Fix duplicates of array_size bewteen unsupported and Core

---
 Eigen/src/Core/util/Meta.h                      | 10 ++++++++--
 unsupported/Eigen/CXX11/src/util/EmulateArray.h | 12 ------------
 2 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h
index 804657f7b..ee0531b32 100755
--- a/Eigen/src/Core/util/Meta.h
+++ b/Eigen/src/Core/util/Meta.h
@@ -290,7 +290,7 @@ protected:
   *  - std::array (c++11)
   *  - some internal types such as SingleRange and AllRange
   *
-  * The second template parameter ease SFINAE-based specializations.
+  * The second template parameter eases SFINAE-based specializations.
   */
 template<typename T, typename EnableIf = void> struct array_size {
   enum { value = Dynamic };
@@ -303,8 +303,14 @@ template<typename T> struct array_size<T,typename internal::enable_if<((T::SizeA
 template<typename T, int N> struct array_size<const T (&)[N]> {
   enum { value = N };
 };
+template<typename T, int N> struct array_size<T (&)[N]> {
+  enum { value = N };
+};
 
-#ifdef EIGEN_HAS_CXX11
+#if EIGEN_HAS_CXX11
+template<typename T, std::size_t N> struct array_size<const std::array<T,N> > {
+  enum { value = N };
+};
 template<typename T, std::size_t N> struct array_size<std::array<T,N> > {
   enum { value = N };
 };
diff --git a/unsupported/Eigen/CXX11/src/util/EmulateArray.h b/unsupported/Eigen/CXX11/src/util/EmulateArray.h
index 30d3ebcff..03169d591 100644
--- a/unsupported/Eigen/CXX11/src/util/EmulateArray.h
+++ b/unsupported/Eigen/CXX11/src/util/EmulateArray.h
@@ -200,19 +200,15 @@ EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const T& array_get(const array<T,N>& a) {
   return a[I];
 }
 
-template <typename T> struct array_size;
 template<class T, std::size_t N> struct array_size<array<T,N> > {
   static const size_t value = N;
 };
-template <typename T> struct array_size;
 template<class T, std::size_t N> struct array_size<array<T,N>& > {
   static const size_t value = N;
 };
-template <typename T> struct array_size;
 template<class T, std::size_t N> struct array_size<const array<T,N> > {
   static const size_t value = N;
 };
-template <typename T> struct array_size;
 template<class T, std::size_t N> struct array_size<const array<T,N>& > {
   static const size_t value = N;
 };
@@ -251,14 +247,6 @@ template<std::size_t I, class T, std::size_t N> constexpr inline T const& array_
 
 #undef STD_GET_ARR_HACK
 
-template <typename T> struct array_size;
-template<class T, std::size_t N> struct array_size<const std::array<T,N> > {
-  static const size_t value = N;
-};
-template <typename T> struct array_size;
-template<class T, std::size_t N> struct array_size<std::array<T,N> > {
-  static const size_t value = N;
-};
 }  // end namespace internal
 }  // end namespace Eigen