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-rw-r--r-- | src/Core/Block.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/Core/Block.h b/src/Core/Block.h new file mode 100644 index 000000000..72f291034 --- /dev/null +++ b/src/Core/Block.h @@ -0,0 +1,83 @@ +// 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_BLOCK_H +#define EIGEN_BLOCK_H + +template<typename MatrixType, int BlockRows, int BlockCols> class Block + : public MatrixBase<typename MatrixType::Scalar, + Block<MatrixType, BlockRows, BlockCols> > +{ + public: + typedef typename MatrixType::Scalar Scalar; + typedef typename MatrixType::Ref MatRef; + friend class MatrixBase<Scalar, Block<MatrixType, BlockRows, BlockCols> >; + + static const int RowsAtCompileTime = BlockRows, + ColsAtCompileTime = BlockCols; + + Block(const MatRef& matrix, int startRow, int startCol) + : m_matrix(matrix), m_startRow(startRow), m_startCol(startCol) + { + assert(startRow >= 0 && BlockRows >= 1 && startRow + BlockRows <= matrix.rows() + && startCol >= 0 && BlockCols >= 1 && startCol + BlockCols <= matrix.rows()); + } + + Block(const Block& other) + : m_matrix(other.m_matrix), + m_startRow(other.m_startRow), m_startCol(other.m_startCol) {} + + EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Block) + + private: + const Block& _ref() const { return *this; } + int _rows() const { return BlockRows; } + int _cols() const { return BlockCols; } + + Scalar& _write(int row, int col) + { + return m_matrix.write(row + m_startRow, col + m_startCol); + } + + Scalar _read(int row, int col) const + { + return m_matrix.read(row + m_startRow, col + m_startCol); + } + + protected: + MatRef m_matrix; + const int m_startRow, m_startCol; +}; + +template<typename Scalar, typename Derived> +template<int BlockRows, int BlockCols> +Block<Derived, BlockRows, BlockCols> MatrixBase<Scalar, Derived> + ::block(int startRow, int startCol) const +{ + return Block<Derived, BlockRows, BlockCols> + (static_cast<Derived*>(const_cast<MatrixBase*>(this))->ref(), startRow, startCol); +} + +#endif // EIGEN_BLOCK_H |