Extended support for Tensors:

* Added ability to map a region of the memory to a tensor
  * Added basic support for unary and binary coefficient wise expressions, such as addition or square root
  * Provided an emulation layer to make it possible to compile the code with compilers (such as nvcc) that don't support cxx11.

unsupported/Eigen/CXX11/src/Tensor/TensorAssign.h

@@ -0,0 +1,52 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_CXX11_TENSOR_TENSOR_ASSIGN_H
+#define EIGEN_CXX11_TENSOR_TENSOR_ASSIGN_H
+
+
+namespace Eigen {
+
+/** \class TensorAssign
+  * \ingroup CXX11_Tensor_Module
+  *
+  * \brief The tensor assignment class.
+  *
+  * This class is responsible for triggering the evaluation of the expressions
+  * used on the lhs and rhs of an assignment operator and copy the result of
+  * the evaluation of the rhs expression at the address computed during the
+  * evaluation lhs expression.
+  *
+  * TODO: vectorization. For now the code only uses scalars
+  * TODO: parallelisation using multithreading on cpu, or kernels on gpu.
+  */
+namespace internal {
+
+template<typename Derived1, typename Derived2>
+struct TensorAssign
+{
+  typedef typename Derived1::Index Index;
+  EIGEN_DEVICE_FUNC
+  static inline void run(Derived1& dst, const Derived2& src)
+  {
+    TensorEvaluator<Derived1> evalDst(dst);
+    TensorEvaluator<Derived2> evalSrc(src);
+    const Index size = dst.size();
+    for(Index i = 0; i < size; ++i) {
+      evalDst.coeffRef(i) = evalSrc.coeff(i);
+    }
+  }
+};
+
+
+} // end namespace internal
+
+} // end namespace Eigen
+
+#endif // EIGEN_CXX11_TENSOR_TENSOR_ASSIGN_H