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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
//
// Eigen is free software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation; either version 2 or (at your option) any later version.
//
// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along
// with Eigen; if not, write to the Free Software Foundation, Inc., 51
// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. This exception does not invalidate any other reasons why a work
// based on this file might be covered by the GNU General Public License.
#ifndef EIGEN_MINOR_H
#define EIGEN_MINOR_H
/** \class Minor
*
* \brief Expression of a minor
*
* \param MatrixType the type of the object in which we are taking a minor
*
* This class represents an expression of a minor. It is the return
* type of MatrixBase::minor() and most of the time this is the only way it
* is used.
*
* \sa MatrixBase::minor()
*/
template<typename MatrixType> class Minor
: public MatrixBase<typename MatrixType::Scalar, Minor<MatrixType> >
{
public:
typedef typename MatrixType::Scalar Scalar;
typedef typename MatrixType::Ref MatRef;
friend class MatrixBase<Scalar, Minor>;
typedef MatrixBase<Scalar, Minor> Base;
Minor(const MatRef& matrix,
int row, int col)
: m_matrix(matrix), m_row(row), m_col(col)
{
assert(row >= 0 && row < matrix.rows()
&& col >= 0 && col < matrix.cols());
}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Minor)
private:
enum {
RowsAtCompileTime = (MatrixType::Traits::RowsAtCompileTime != Dynamic) ?
MatrixType::Traits::RowsAtCompileTime - 1 : Dynamic,
ColsAtCompileTime = (MatrixType::Traits::ColsAtCompileTime != Dynamic) ?
MatrixType::Traits::ColsAtCompileTime - 1 : Dynamic,
MaxRowsAtCompileTime = (MatrixType::Traits::MaxRowsAtCompileTime != Dynamic) ?
MatrixType::Traits::MaxRowsAtCompileTime - 1 : Dynamic,
MaxColsAtCompileTime = (MatrixType::Traits::MaxColsAtCompileTime != Dynamic) ?
MatrixType::Traits::MaxColsAtCompileTime - 1 : Dynamic
};
const Minor& _ref() const { return *this; }
int _rows() const { return m_matrix.rows() - 1; }
int _cols() const { return m_matrix.cols() - 1; }
Scalar& _coeffRef(int row, int col)
{
return m_matrix.coeffRef(row + (row >= m_row), col + (col >= m_col));
}
Scalar _coeff(int row, int col) const
{
return m_matrix.coeff(row + (row >= m_row), col + (col >= m_col));
}
protected:
MatRef m_matrix;
const int m_row, m_col;
};
/** \return an expression of the (\a row, \a col)-minor of *this,
* i.e. an expression constructed from *this by removing the specified
* row and column.
*
* Example: \include MatrixBase_minor.cpp
* Output: \verbinclude MatrixBase_minor.out
*
* \sa class Minor
*/
template<typename Scalar, typename Derived>
Minor<Derived>
MatrixBase<Scalar, Derived>::minor(int row, int col)
{
return Minor<Derived>(ref(), row, col);
}
/** This is the const version of minor(). */
template<typename Scalar, typename Derived>
const Minor<Derived>
MatrixBase<Scalar, Derived>::minor(int row, int col) const
{
return Minor<Derived>(ref(), row, col);
}
#endif // EIGEN_MINOR_H
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