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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) 2006-2007 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_COLUMN_H
#define EIGEN_COLUMN_H
template<typename MatrixType> class Column
: public MatrixBase<typename MatrixType::Scalar, Column<MatrixType> >
{
public:
typedef typename MatrixType::Scalar Scalar;
typedef typename MatrixType::Ref MatRef;
friend class MatrixBase<Scalar, Column<MatrixType> >;
Column(const MatRef& matrix, int col)
: m_matrix(matrix), m_col(col)
{
assert(col >= 0 && col < matrix.cols());
}
Column(const Column& other)
: m_matrix(other.m_matrix), m_col(other.m_col) {}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Column)
private:
static const int _RowsAtCompileTime = MatrixType::RowsAtCompileTime,
_ColsAtCompileTime = 1;
const Column& _ref() const { return *this; }
int _rows() const { return m_matrix.rows(); }
int _cols() const { return 1; }
Scalar& _coeffRef(int row, int)
{
return m_matrix.coeffRef(row, m_col);
}
Scalar _coeff(int row, int) const
{
return m_matrix.coeff(row, m_col);
}
protected:
MatRef m_matrix;
const int m_col;
};
/** \returns an expression of the \a i-th column of *this.
* \sa row(int) */
template<typename Scalar, typename Derived>
Column<Derived>
MatrixBase<Scalar, Derived>::col(int i) const
{
return Column<Derived>(static_cast<Derived*>(const_cast<MatrixBase*>(this))->ref(), i);
}
#endif // EIGEN_COLUMN_H
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