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Diffstat (limited to 'Eigen/Core/Column.h')
-rw-r--r-- | Eigen/Core/Column.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Eigen/Core/Column.h b/Eigen/Core/Column.h new file mode 100644 index 000000000..d1d7f1453 --- /dev/null +++ b/Eigen/Core/Column.h @@ -0,0 +1,79 @@ +// 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 |