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Diffstat (limited to 'src/Core/Opposite.h')
-rw-r--r-- | src/Core/Opposite.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/Core/Opposite.h b/src/Core/Opposite.h new file mode 100644 index 000000000..e99a8f2ee --- /dev/null +++ b/src/Core/Opposite.h @@ -0,0 +1,69 @@ +// 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 EI_OPPOSITE_H +#define EI_OPPOSITE_H + +template<typename MatrixType> class Opposite + : public Object<typename MatrixType::Scalar, Opposite<MatrixType> > +{ + public: + typedef typename MatrixType::Scalar Scalar; + typedef typename MatrixType::ConstRef MatRef; + friend class Object<Scalar, Opposite<MatrixType> >; + + static const int RowsAtCompileTime = MatrixType::RowsAtCompileTime, + ColsAtCompileTime = MatrixType::ColsAtCompileTime; + + Opposite(const MatRef& matrix) : m_matrix(matrix) {} + + Opposite(const Opposite& other) + : m_matrix(other.m_matrix) {} + + EI_INHERIT_ASSIGNMENT_OPERATORS(Opposite) + + private: + Opposite& _ref() { return *this; } + const Opposite& _constRef() const { return *this; } + int _rows() const { return m_matrix.rows(); } + int _cols() const { return m_matrix.cols(); } + + Scalar _read(int row, int col) const + { + return -(m_matrix.read(row, col)); + } + + protected: + MatRef m_matrix; +}; + +template<typename Scalar, typename Derived> +Opposite<Derived> +Object<Scalar, Derived>::operator-() const +{ + return Opposite<Derived>(static_cast<const Derived*>(this)->constRef()); +} + +#endif // EI_OPPOSITE_H |