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79 lines
2.7 KiB
C++
79 lines
2.7 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 EIGEN_ZERO_H
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#define EIGEN_ZERO_H
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template<typename MatrixType> class Zero : NoOperatorEquals,
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public MatrixBase<typename MatrixType::Scalar, Zero<MatrixType> >
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{
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public:
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typedef typename MatrixType::Scalar Scalar;
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friend class MatrixBase<Scalar, Zero<MatrixType> >;
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Zero(int rows, int cols) : m_rows(rows), m_cols(cols)
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{
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assert(rows > 0 && cols > 0);
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}
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private:
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static const int _RowsAtCompileTime = MatrixType::RowsAtCompileTime,
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_ColsAtCompileTime = MatrixType::ColsAtCompileTime;
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const Zero& _ref() const { return *this; }
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int _rows() const { return m_rows; }
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int _cols() const { return m_cols; }
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Scalar _coeff(int, int) const
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{
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return static_cast<Scalar>(0);
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}
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protected:
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int m_rows, m_cols;
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};
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template<typename Scalar, typename Derived>
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const Zero<Derived> MatrixBase<Scalar, Derived>::zero(int rows, int cols)
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{
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return Zero<Derived>(rows, cols);
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}
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template<typename Scalar, typename Derived>
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const Zero<Derived> MatrixBase<Scalar, Derived>::zero(int size)
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{
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assert(IsVector);
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if(RowsAtCompileTime == 1) return Zero<Derived>(1, size);
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else return Zero<Derived>(size, 1);
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}
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template<typename Scalar, typename Derived>
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const Zero<Derived> MatrixBase<Scalar, Derived>::zero()
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{
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return Zero<Derived>(RowsAtCompileTime, ColsAtCompileTime);
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}
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#endif // EIGEN_ZERO_H
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