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Diffstat (limited to 'src/Core/Difference.h')
-rw-r--r-- | src/Core/Difference.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/Core/Difference.h b/src/Core/Difference.h new file mode 100644 index 000000000..182555c83 --- /dev/null +++ b/src/Core/Difference.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 EI_DIFFERENCE_H +#define EI_DIFFERENCE_H + +template<typename Lhs, typename Rhs> class Difference + : public Object<typename Lhs::Scalar, Difference<Lhs, Rhs> > +{ + public: + typedef typename Lhs::Scalar Scalar; + typedef typename Lhs::ConstRef LhsRef; + typedef typename Rhs::ConstRef RhsRef; + friend class Object<Scalar, Difference>; + + static const int RowsAtCompileTime = Lhs::RowsAtCompileTime, + ColsAtCompileTime = Rhs::ColsAtCompileTime; + + Difference(const LhsRef& lhs, const RhsRef& rhs) + : m_lhs(lhs), m_rhs(rhs) + { + assert(lhs.rows() == rhs.rows() && lhs.cols() == rhs.cols()); + } + + Difference(const Difference& other) + : m_lhs(other.m_lhs), m_rhs(other.m_rhs) {} + + EI_INHERIT_ASSIGNMENT_OPERATORS(Difference) + + private: + const Difference& _ref() const { return *this; } + const Difference& _constRef() const { return *this; } + int _rows() const { return m_lhs.rows(); } + int _cols() const { return m_lhs.cols(); } + + Scalar _read(int row, int col) const + { + return m_lhs.read(row, col) - m_rhs.read(row, col); + } + + protected: + const LhsRef m_lhs; + const RhsRef m_rhs; +}; + +template<typename Scalar, typename Derived1, typename Derived2> +Difference<Derived1, Derived2> +operator-(const Object<Scalar, Derived1> &mat1, const Object<Scalar, Derived2> &mat2) +{ + return Difference<Derived1, Derived2>(mat1.constRef(), mat2.constRef()); +} + +template<typename Scalar, typename Derived> +template<typename OtherDerived> +Derived & +Object<Scalar, Derived>::operator-=(const Object<Scalar, OtherDerived> &other) +{ + return *this = *this - other; +} + +#endif // EI_DIFFERENCE_H |