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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@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_VECTORBLOCK_H
+#define EIGEN_VECTORBLOCK_H
+
+namespace Eigen {
+
+namespace internal {
+template<typename VectorType, int Size>
+struct traits<VectorBlock<VectorType, Size> >
+ : public traits<Block<VectorType,
+ traits<VectorType>::Flags & RowMajorBit ? 1 : Size,
+ traits<VectorType>::Flags & RowMajorBit ? Size : 1> >
+{
+};
+}
+
+/** \class VectorBlock
+ * \ingroup Core_Module
+ *
+ * \brief Expression of a fixed-size or dynamic-size sub-vector
+ *
+ * \tparam VectorType the type of the object in which we are taking a sub-vector
+ * \tparam Size size of the sub-vector we are taking at compile time (optional)
+ *
+ * This class represents an expression of either a fixed-size or dynamic-size sub-vector.
+ * It is the return type of DenseBase::segment(Index,Index) and DenseBase::segment<int>(Index) and
+ * most of the time this is the only way it is used.
+ *
+ * However, if you want to directly maniputate sub-vector expressions,
+ * for instance if you want to write a function returning such an expression, you
+ * will need to use this class.
+ *
+ * Here is an example illustrating the dynamic case:
+ * \include class_VectorBlock.cpp
+ * Output: \verbinclude class_VectorBlock.out
+ *
+ * \note Even though this expression has dynamic size, in the case where \a VectorType
+ * has fixed size, this expression inherits a fixed maximal size which means that evaluating
+ * it does not cause a dynamic memory allocation.
+ *
+ * Here is an example illustrating the fixed-size case:
+ * \include class_FixedVectorBlock.cpp
+ * Output: \verbinclude class_FixedVectorBlock.out
+ *
+ * \sa class Block, DenseBase::segment(Index,Index,Index,Index), DenseBase::segment(Index,Index)
+ */
+template<typename VectorType, int Size> class VectorBlock
+ : public Block<VectorType,
+ internal::traits<VectorType>::Flags & RowMajorBit ? 1 : Size,
+ internal::traits<VectorType>::Flags & RowMajorBit ? Size : 1>
+{
+ typedef Block<VectorType,
+ internal::traits<VectorType>::Flags & RowMajorBit ? 1 : Size,
+ internal::traits<VectorType>::Flags & RowMajorBit ? Size : 1> Base;
+ enum {
+ IsColVector = !(internal::traits<VectorType>::Flags & RowMajorBit)
+ };
+ public:
+ EIGEN_DENSE_PUBLIC_INTERFACE(VectorBlock)
+
+ using Base::operator=;
+
+ /** Dynamic-size constructor
+ */
+ EIGEN_DEVICE_FUNC
+ inline VectorBlock(VectorType& vector, Index start, Index size)
+ : Base(vector,
+ IsColVector ? start : 0, IsColVector ? 0 : start,
+ IsColVector ? size : 1, IsColVector ? 1 : size)
+ {
+ EIGEN_STATIC_ASSERT_VECTOR_ONLY(VectorBlock);
+ }
+
+ /** Fixed-size constructor
+ */
+ EIGEN_DEVICE_FUNC
+ inline VectorBlock(VectorType& vector, Index start)
+ : Base(vector, IsColVector ? start : 0, IsColVector ? 0 : start)
+ {
+ EIGEN_STATIC_ASSERT_VECTOR_ONLY(VectorBlock);
+ }
+};
+
+
+} // end namespace Eigen
+
+#endif // EIGEN_VECTORBLOCK_H