From 19e6496ce0c52fef33265bca54285ba77b2155be Mon Sep 17 00:00:00 2001
From: Turing Eret <turingeret@ucar.edu>
Date: Wed, 16 Dec 2020 07:18:09 -0700
Subject: Replace call to FixedDimensions() with a singleton instance of
 FixedDimensions.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h | 2 +-
 unsupported/Eigen/CXX11/src/Tensor/TensorStorage.h   | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

(limited to 'unsupported')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h b/unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h
index c7c1cfc72..ca39bb855 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h
@@ -61,7 +61,7 @@ class TensorFixedSize : public TensorBase<TensorFixedSize<Scalar_, Dimensions_,
   public:
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Index                    rank()                   const { return NumIndices; }
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Index                    dimension(std::size_t n) const { return m_storage.dimensions()[n]; }
-    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Dimensions         dimensions()             const { return m_storage.dimensions(); }
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Dimensions&        dimensions()             const { return m_storage.dimensions(); }
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Index                    size()                   const { return m_storage.size(); }
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Scalar                   *data()                        { return m_storage.data(); }
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar             *data()                  const { return m_storage.data(); }
diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorStorage.h b/unsupported/Eigen/CXX11/src/Tensor/TensorStorage.h
index 695d22b3b..656fd211e 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorStorage.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorStorage.h
@@ -55,14 +55,17 @@ class TensorStorage
   EIGEN_DEVICE_FUNC
   EIGEN_STRONG_INLINE const T *data() const { return m_data; }
 
-  EIGEN_DEVICE_FUNC
-  EIGEN_STRONG_INLINE const FixedDimensions dimensions() const { return FixedDimensions(); }
+  static EIGEN_DEVICE_FUNC
+  EIGEN_STRONG_INLINE const FixedDimensions& dimensions()
+  {
+    static const FixedDimensions* singleton_dimensions = new FixedDimensions();
+    return *singleton_dimensions;
+  }
 
   EIGEN_DEVICE_FUNC
   EIGEN_STRONG_INLINE DenseIndex size() const { return Size; }
 };
 
-
 // pure dynamic
 template<typename T, typename IndexType, int NumIndices_, int Options_>
 class TensorStorage<T, DSizes<IndexType, NumIndices_>, Options_>
-- 
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