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73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
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//
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// Eigen is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3 of the License, or (at your option) any later version.
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//
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// Alternatively, you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, 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 Lesser General Public License or the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License and a copy of the GNU General Public License along with
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// Eigen. If not, see <http://www.gnu.org/licenses/>.
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#ifndef EIGEN_COREITERATORS_H
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#define EIGEN_COREITERATORS_H
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/* This file contains the respective InnerIterator definition of the expressions defined in Eigen/Core
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*/
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/** \ingroup SparseCore_Module
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* \class InnerIterator
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* \brief An InnerIterator allows to loop over the element of a sparse (or dense) matrix or expression
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*
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* todo
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*/
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// generic version for dense matrix and expressions
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template<typename Derived> class DenseBase<Derived>::InnerIterator
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{
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protected:
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typedef typename Derived::Scalar Scalar;
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typedef typename Derived::Index Index;
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enum { IsRowMajor = (Derived::Flags&RowMajorBit)==RowMajorBit };
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public:
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EIGEN_STRONG_INLINE InnerIterator(const Derived& expr, Index outer)
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: m_expression(expr), m_inner(0), m_outer(outer), m_end(expr.innerSize())
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{}
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EIGEN_STRONG_INLINE Scalar value() const
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{
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return (IsRowMajor) ? m_expression.coeff(m_outer, m_inner)
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: m_expression.coeff(m_inner, m_outer);
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}
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EIGEN_STRONG_INLINE InnerIterator& operator++() { m_inner++; return *this; }
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EIGEN_STRONG_INLINE Index index() const { return m_inner; }
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inline Index row() const { return IsRowMajor ? m_outer : index(); }
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inline Index col() const { return IsRowMajor ? index() : m_outer; }
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EIGEN_STRONG_INLINE operator bool() const { return m_inner < m_end && m_inner>=0; }
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protected:
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const Derived& m_expression;
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Index m_inner;
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const Index m_outer;
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const Index m_end;
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};
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#endif // EIGEN_COREITERATORS_H
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