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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2009 Ricard Marxer <email@ricardmarxer.com>
+// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// 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_REVERSE_H
+#define EIGEN_REVERSE_H
+
+namespace Eigen {
+
+namespace internal {
+
+template<typename MatrixType, int Direction>
+struct traits<Reverse<MatrixType, Direction> >
+ : traits<MatrixType>
+{
+ typedef typename MatrixType::Scalar Scalar;
+ typedef typename traits<MatrixType>::StorageKind StorageKind;
+ typedef typename traits<MatrixType>::XprKind XprKind;
+ typedef typename ref_selector<MatrixType>::type MatrixTypeNested;
+ typedef typename remove_reference<MatrixTypeNested>::type _MatrixTypeNested;
+ enum {
+ RowsAtCompileTime = MatrixType::RowsAtCompileTime,
+ ColsAtCompileTime = MatrixType::ColsAtCompileTime,
+ MaxRowsAtCompileTime = MatrixType::MaxRowsAtCompileTime,
+ MaxColsAtCompileTime = MatrixType::MaxColsAtCompileTime,
+ Flags = _MatrixTypeNested::Flags & (RowMajorBit | LvalueBit)
+ };
+};
+
+template<typename PacketType, bool ReversePacket> struct reverse_packet_cond
+{
+ static inline PacketType run(const PacketType& x) { return preverse(x); }
+};
+
+template<typename PacketType> struct reverse_packet_cond<PacketType,false>
+{
+ static inline PacketType run(const PacketType& x) { return x; }
+};
+
+} // end namespace internal
+
+/** \class Reverse
+ * \ingroup Core_Module
+ *
+ * \brief Expression of the reverse of a vector or matrix
+ *
+ * \tparam MatrixType the type of the object of which we are taking the reverse
+ * \tparam Direction defines the direction of the reverse operation, can be Vertical, Horizontal, or BothDirections
+ *
+ * This class represents an expression of the reverse of a vector.
+ * It is the return type of MatrixBase::reverse() and VectorwiseOp::reverse()
+ * and most of the time this is the only way it is used.
+ *
+ * \sa MatrixBase::reverse(), VectorwiseOp::reverse()
+ */
+template<typename MatrixType, int Direction> class Reverse
+ : public internal::dense_xpr_base< Reverse<MatrixType, Direction> >::type
+{
+ public:
+
+ typedef typename internal::dense_xpr_base<Reverse>::type Base;
+ EIGEN_DENSE_PUBLIC_INTERFACE(Reverse)
+ typedef typename internal::remove_all<MatrixType>::type NestedExpression;
+ using Base::IsRowMajor;
+
+ protected:
+ enum {
+ PacketSize = internal::packet_traits<Scalar>::size,
+ IsColMajor = !IsRowMajor,
+ ReverseRow = (Direction == Vertical) || (Direction == BothDirections),
+ ReverseCol = (Direction == Horizontal) || (Direction == BothDirections),
+ OffsetRow = ReverseRow && IsColMajor ? PacketSize : 1,
+ OffsetCol = ReverseCol && IsRowMajor ? PacketSize : 1,
+ ReversePacket = (Direction == BothDirections)
+ || ((Direction == Vertical) && IsColMajor)
+ || ((Direction == Horizontal) && IsRowMajor)
+ };
+ typedef internal::reverse_packet_cond<PacketScalar,ReversePacket> reverse_packet;
+ public:
+
+ EIGEN_DEVICE_FUNC explicit inline Reverse(const MatrixType& matrix) : m_matrix(matrix) { }
+
+ EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Reverse)
+
+ EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
+ inline Index rows() const EIGEN_NOEXCEPT { return m_matrix.rows(); }
+ EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
+ inline Index cols() const EIGEN_NOEXCEPT { return m_matrix.cols(); }
+
+ EIGEN_DEVICE_FUNC inline Index innerStride() const
+ {
+ return -m_matrix.innerStride();
+ }
+
+ EIGEN_DEVICE_FUNC const typename internal::remove_all<typename MatrixType::Nested>::type&
+ nestedExpression() const
+ {
+ return m_matrix;
+ }
+
+ protected:
+ typename MatrixType::Nested m_matrix;
+};
+
+/** \returns an expression of the reverse of *this.
+ *
+ * Example: \include MatrixBase_reverse.cpp
+ * Output: \verbinclude MatrixBase_reverse.out
+ *
+ */
+template<typename Derived>
+EIGEN_DEVICE_FUNC inline typename DenseBase<Derived>::ReverseReturnType
+DenseBase<Derived>::reverse()
+{
+ return ReverseReturnType(derived());
+}
+
+
+//reverse const overload moved DenseBase.h due to a CUDA compiler bug
+
+/** This is the "in place" version of reverse: it reverses \c *this.
+ *
+ * In most cases it is probably better to simply use the reversed expression
+ * of a matrix. However, when reversing the matrix data itself is really needed,
+ * then this "in-place" version is probably the right choice because it provides
+ * the following additional benefits:
+ * - less error prone: doing the same operation with .reverse() requires special care:
+ * \code m = m.reverse().eval(); \endcode
+ * - this API enables reverse operations without the need for a temporary
+ * - it allows future optimizations (cache friendliness, etc.)
+ *
+ * \sa VectorwiseOp::reverseInPlace(), reverse() */
+template<typename Derived>
+EIGEN_DEVICE_FUNC inline void DenseBase<Derived>::reverseInPlace()
+{
+ if(cols()>rows())
+ {
+ Index half = cols()/2;
+ leftCols(half).swap(rightCols(half).reverse());
+ if((cols()%2)==1)
+ {
+ Index half2 = rows()/2;
+ col(half).head(half2).swap(col(half).tail(half2).reverse());
+ }
+ }
+ else
+ {
+ Index half = rows()/2;
+ topRows(half).swap(bottomRows(half).reverse());
+ if((rows()%2)==1)
+ {
+ Index half2 = cols()/2;
+ row(half).head(half2).swap(row(half).tail(half2).reverse());
+ }
+ }
+}
+
+namespace internal {
+
+template<int Direction>
+struct vectorwise_reverse_inplace_impl;
+
+template<>
+struct vectorwise_reverse_inplace_impl<Vertical>
+{
+ template<typename ExpressionType>
+ static void run(ExpressionType &xpr)
+ {
+ const int HalfAtCompileTime = ExpressionType::RowsAtCompileTime==Dynamic?Dynamic:ExpressionType::RowsAtCompileTime/2;
+ Index half = xpr.rows()/2;
+ xpr.topRows(fix<HalfAtCompileTime>(half))
+ .swap(xpr.bottomRows(fix<HalfAtCompileTime>(half)).colwise().reverse());
+ }
+};
+
+template<>
+struct vectorwise_reverse_inplace_impl<Horizontal>
+{
+ template<typename ExpressionType>
+ static void run(ExpressionType &xpr)
+ {
+ const int HalfAtCompileTime = ExpressionType::ColsAtCompileTime==Dynamic?Dynamic:ExpressionType::ColsAtCompileTime/2;
+ Index half = xpr.cols()/2;
+ xpr.leftCols(fix<HalfAtCompileTime>(half))
+ .swap(xpr.rightCols(fix<HalfAtCompileTime>(half)).rowwise().reverse());
+ }
+};
+
+} // end namespace internal
+
+/** This is the "in place" version of VectorwiseOp::reverse: it reverses each column or row of \c *this.
+ *
+ * In most cases it is probably better to simply use the reversed expression
+ * of a matrix. However, when reversing the matrix data itself is really needed,
+ * then this "in-place" version is probably the right choice because it provides
+ * the following additional benefits:
+ * - less error prone: doing the same operation with .reverse() requires special care:
+ * \code m = m.reverse().eval(); \endcode
+ * - this API enables reverse operations without the need for a temporary
+ *
+ * \sa DenseBase::reverseInPlace(), reverse() */
+template<typename ExpressionType, int Direction>
+EIGEN_DEVICE_FUNC void VectorwiseOp<ExpressionType,Direction>::reverseInPlace()
+{
+ internal::vectorwise_reverse_inplace_impl<Direction>::run(m_matrix);
+}
+
+} // end namespace Eigen
+
+#endif // EIGEN_REVERSE_H