85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
|
|
// for linear algebra.
|
|
//
|
|
// Copyright (C) 2009 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_MISC_IMAGE_H
|
|
#define EIGEN_MISC_IMAGE_H
|
|
|
|
namespace Eigen {
|
|
|
|
namespace internal {
|
|
|
|
/** \class image_retval_base
|
|
*
|
|
*/
|
|
template<typename DecompositionType>
|
|
struct traits<image_retval_base<DecompositionType> >
|
|
{
|
|
typedef typename DecompositionType::MatrixType MatrixType;
|
|
typedef Matrix<
|
|
typename MatrixType::Scalar,
|
|
MatrixType::RowsAtCompileTime, // the image is a subspace of the destination space, whose
|
|
// dimension is the number of rows of the original matrix
|
|
Dynamic, // we don't know at compile time the dimension of the image (the rank)
|
|
MatrixType::Options,
|
|
MatrixType::MaxRowsAtCompileTime, // the image matrix will consist of columns from the original matrix,
|
|
MatrixType::MaxColsAtCompileTime // so it has the same number of rows and at most as many columns.
|
|
> ReturnType;
|
|
};
|
|
|
|
template<typename _DecompositionType> struct image_retval_base
|
|
: public ReturnByValue<image_retval_base<_DecompositionType> >
|
|
{
|
|
typedef _DecompositionType DecompositionType;
|
|
typedef typename DecompositionType::MatrixType MatrixType;
|
|
typedef ReturnByValue<image_retval_base> Base;
|
|
typedef typename Base::Index Index;
|
|
|
|
image_retval_base(const DecompositionType& dec, const MatrixType& originalMatrix)
|
|
: m_dec(dec), m_rank(dec.rank()),
|
|
m_cols(m_rank == 0 ? 1 : m_rank),
|
|
m_originalMatrix(originalMatrix)
|
|
{}
|
|
|
|
inline Index rows() const { return m_dec.rows(); }
|
|
inline Index cols() const { return m_cols; }
|
|
inline Index rank() const { return m_rank; }
|
|
inline const DecompositionType& dec() const { return m_dec; }
|
|
inline const MatrixType& originalMatrix() const { return m_originalMatrix; }
|
|
|
|
template<typename Dest> inline void evalTo(Dest& dst) const
|
|
{
|
|
static_cast<const image_retval<DecompositionType>*>(this)->evalTo(dst);
|
|
}
|
|
|
|
protected:
|
|
const DecompositionType& m_dec;
|
|
Index m_rank, m_cols;
|
|
const MatrixType& m_originalMatrix;
|
|
};
|
|
|
|
} // end namespace internal
|
|
|
|
#define EIGEN_MAKE_IMAGE_HELPERS(DecompositionType) \
|
|
typedef typename DecompositionType::MatrixType MatrixType; \
|
|
typedef typename MatrixType::Scalar Scalar; \
|
|
typedef typename MatrixType::RealScalar RealScalar; \
|
|
typedef typename MatrixType::Index Index; \
|
|
typedef Eigen::internal::image_retval_base<DecompositionType> Base; \
|
|
using Base::dec; \
|
|
using Base::originalMatrix; \
|
|
using Base::rank; \
|
|
using Base::rows; \
|
|
using Base::cols; \
|
|
image_retval(const DecompositionType& dec, const MatrixType& originalMatrix) \
|
|
: Base(dec, originalMatrix) {}
|
|
|
|
} // end namespace Eigen
|
|
|
|
#endif // EIGEN_MISC_IMAGE_H
|