86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra. Eigen itself is part of the KDE project.
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//
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// Copyright (C) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
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//
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// Eigen is free software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the Free Software
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// Foundation; either version 2 or (at your option) any later version.
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//
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// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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// details.
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//
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// You should have received a copy of the GNU General Public License along
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// with Eigen; if not, write to the Free Software Foundation, Inc., 51
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// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. This exception does not invalidate any other reasons why a work
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// based on this file might be covered by the GNU General Public License.
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#ifndef EI_BLOCK_H
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#define EI_BLOCK_H
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template<typename MatrixType> class Block
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: public Object<typename MatrixType::Scalar, Block<MatrixType> >
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{
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public:
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typedef typename MatrixType::Scalar Scalar;
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typedef typename MatrixType::Ref MatRef;
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friend class Object<Scalar, Block<MatrixType> >;
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static const int RowsAtCompileTime = Dynamic,
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ColsAtCompileTime = Dynamic;
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Block(const MatRef& matrix,
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int startRow, int endRow,
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int startCol = 0, int endCol = 0)
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: m_matrix(matrix), m_startRow(startRow), m_endRow(endRow),
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m_startCol(startCol), m_endCol(endCol)
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{
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assert(startRow >= 0 && startRow <= endRow && endRow < matrix.rows()
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&& startCol >= 0 && startCol <= endCol && endCol < matrix.cols());
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}
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Block(const Block& other)
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: m_matrix(other.m_matrix), m_startRow(other.m_startRow), m_endRow(other.m_endRow),
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m_startCol(other.m_startCol), m_endCol(other.m_endCol) {}
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EI_INHERIT_ASSIGNMENT_OPERATORS(Block)
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private:
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Block& _ref() { return *this; }
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const Block& _constRef() const { return *this; }
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int _rows() const { return m_endRow - m_startRow + 1; }
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int _cols() const { return m_endCol - m_startCol + 1; }
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Scalar& _write(int row, int col=0)
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{
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return m_matrix.write(row + m_startRow, col + m_startCol);
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}
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Scalar _read(int row, int col=0) const
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{
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return m_matrix.read(row + m_startRow, col + m_startCol);
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}
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protected:
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MatRef m_matrix;
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const int m_startRow, m_endRow, m_startCol, m_endCol;
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};
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template<typename Scalar, typename Derived>
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Block<Derived>
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Object<Scalar, Derived>::block(int startRow, int endRow, int startCol, int endCol) const
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{
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return Block<Derived>(static_cast<Derived*>(const_cast<Object*>(this))->ref(),
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startRow, endRow, startCol, endCol);
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}
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#endif // EI_BLOCK_H
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