From 0320f7e3a71406b9a03d1bab0d168fd76e63d457 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Tue, 6 May 2014 11:18:37 -0700
Subject: Added support for fixed sized tensors. Improved support for tensor
 expressions.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorMap.h | 31 +++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 6 deletions(-)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorMap.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorMap.h b/unsupported/Eigen/CXX11/src/Tensor/TensorMap.h
index 7dec1e08d..bb0b39c5a 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorMap.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorMap.h
@@ -43,24 +43,38 @@ template<typename PlainObjectType> class TensorMap : public TensorBase<TensorMap
     typedef Scalar* PointerType;
     typedef PointerType PointerArgType;
 
+  // Fixed size plain object type only
+  /*  EIGEN_DEVICE_FUNC
+    EIGEN_STRONG_INLINE TensorMap(PointerArgType dataPtr) : m_data(dataPtr) {
+      // The number of dimensions used to construct a tensor must be equal to the rank of the tensor.
+  //EIGEN_STATIC_ASSERT(1 == PlainObjectType::NumIndices, YOU_MADE_A_PROGRAMMING_MISTAKE)
+  // todo: add assert to ensure we don't screw up here.
+  }*/
+
     EIGEN_DEVICE_FUNC
-    EIGEN_STRONG_INLINE TensorMap(PointerArgType dataPtr, Index firstDimension) : m_data(dataPtr), m_dimensions({{firstDimension}}) {
+    EIGEN_STRONG_INLINE TensorMap(PointerArgType dataPtr, Index firstDimension) : m_data(dataPtr), m_dimensions(array<DenseIndex, PlainObjectType::NumIndices>({{firstDimension}})) {
       // The number of dimensions used to construct a tensor must be equal to the rank of the tensor.
       EIGEN_STATIC_ASSERT(1 == PlainObjectType::NumIndices, YOU_MADE_A_PROGRAMMING_MISTAKE)
     }
 
 #ifdef EIGEN_HAS_VARIADIC_TEMPLATES
     template<typename... IndexTypes> EIGEN_DEVICE_FUNC
-    EIGEN_STRONG_INLINE TensorMap(PointerArgType dataPtr, Index firstDimension, IndexTypes... otherDimensions) : m_data(dataPtr), m_dimensions({{firstDimension, otherDimensions...}}) {
+    EIGEN_STRONG_INLINE TensorMap(PointerArgType dataPtr, Index firstDimension, IndexTypes... otherDimensions) : m_data(dataPtr), m_dimensions(array<DenseIndex, PlainObjectType::NumIndices>({{firstDimension, otherDimensions...}})) {
       // The number of dimensions used to construct a tensor must be equal to the rank of the tensor.
       EIGEN_STATIC_ASSERT(sizeof...(otherDimensions) + 1 == PlainObjectType::NumIndices, YOU_MADE_A_PROGRAMMING_MISTAKE)
     }
 #endif
 
+  inline TensorMap(PointerArgType dataPtr, const array<Index, PlainObjectType::NumIndices>& dimensions)
+      : m_data(dataPtr), m_dimensions(dimensions)
+    { }
+
     EIGEN_DEVICE_FUNC
     EIGEN_STRONG_INLINE Index dimension(Index n) const { return m_dimensions[n]; }
     EIGEN_DEVICE_FUNC
-    EIGEN_STRONG_INLINE Index size() const { return internal::array_prod(m_dimensions); }
+    EIGEN_STRONG_INLINE const typename PlainObjectType::Dimensions& dimensions() const { return m_dimensions; }
+    EIGEN_DEVICE_FUNC
+    EIGEN_STRONG_INLINE Index size() const { return m_dimensions.TotalSize(); }
     EIGEN_DEVICE_FUNC
     EIGEN_STRONG_INLINE Scalar* data() { return m_data; }
     EIGEN_DEVICE_FUNC
@@ -78,8 +92,13 @@ template<typename PlainObjectType> class TensorMap : public TensorBase<TensorMap
     EIGEN_STRONG_INLINE Scalar& operator()(Index firstIndex, IndexTypes... otherIndices)
     {
       static_assert(sizeof...(otherIndices) + 1 == PlainObjectType::NumIndices, "Number of indices used to access a tensor coefficient must be equal to the rank of the tensor.");
-      const Index index = internal::tensor_index_linearization_helper<Index, PlainObjectType::NumIndices, PlainObjectType::NumIndices - 1, PlainObjectType::Options&RowMajor>::run(array<Index, PlainObjectType::NumIndices>{{firstIndex, otherIndices...}}, m_dimensions);
-      return m_data[index];
+      if (PlainObjectType::Options&RowMajor) {
+        const Index index = m_dimensions.IndexOfRowMajor(array<Index, PlainObjectType::NumIndices>{{firstIndex, otherIndices...}});
+        return m_data[index];
+      } else {
+        const Index index = m_dimensions.IndexOfColMajor(array<Index, PlainObjectType::NumIndices>{{firstIndex, otherIndices...}});
+        return m_data[index];
+      }
     }
 #endif
 
@@ -93,7 +112,7 @@ template<typename PlainObjectType> class TensorMap : public TensorBase<TensorMap
 
   private:
     typename PlainObjectType::Scalar* m_data;
-    array<DenseIndex, PlainObjectType::NumIndices> m_dimensions;
+    typename PlainObjectType::Dimensions m_dimensions;
 };
 
 } // end namespace Eigen
-- 
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