| Narayan Kamath | c981c48 | 2012-11-02 10:59:05 +0000 | [diff] [blame] | 1 | // This file is part of Eigen, a lightweight C++ template library |
| 2 | // for linear algebra. |
| 3 | // |
| 4 | // Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr> |
| 5 | // |
| 6 | // This Source Code Form is subject to the terms of the Mozilla |
| 7 | // Public License v. 2.0. If a copy of the MPL was not distributed |
| 8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| 9 | |
| 10 | #ifndef EIGEN_COREITERATORS_H |
| 11 | #define EIGEN_COREITERATORS_H |
| 12 | |
| 13 | namespace Eigen { |
| 14 | |
| 15 | /* This file contains the respective InnerIterator definition of the expressions defined in Eigen/Core |
| 16 | */ |
| 17 | |
| 18 | /** \ingroup SparseCore_Module |
| 19 | * \class InnerIterator |
| 20 | * \brief An InnerIterator allows to loop over the element of a sparse (or dense) matrix or expression |
| 21 | * |
| 22 | * todo |
| 23 | */ |
| 24 | |
| 25 | // generic version for dense matrix and expressions |
| 26 | template<typename Derived> class DenseBase<Derived>::InnerIterator |
| 27 | { |
| 28 | protected: |
| 29 | typedef typename Derived::Scalar Scalar; |
| 30 | typedef typename Derived::Index Index; |
| 31 | |
| 32 | enum { IsRowMajor = (Derived::Flags&RowMajorBit)==RowMajorBit }; |
| 33 | public: |
| 34 | EIGEN_STRONG_INLINE InnerIterator(const Derived& expr, Index outer) |
| 35 | : m_expression(expr), m_inner(0), m_outer(outer), m_end(expr.innerSize()) |
| 36 | {} |
| 37 | |
| 38 | EIGEN_STRONG_INLINE Scalar value() const |
| 39 | { |
| 40 | return (IsRowMajor) ? m_expression.coeff(m_outer, m_inner) |
| 41 | : m_expression.coeff(m_inner, m_outer); |
| 42 | } |
| 43 | |
| 44 | EIGEN_STRONG_INLINE InnerIterator& operator++() { m_inner++; return *this; } |
| 45 | |
| 46 | EIGEN_STRONG_INLINE Index index() const { return m_inner; } |
| 47 | inline Index row() const { return IsRowMajor ? m_outer : index(); } |
| 48 | inline Index col() const { return IsRowMajor ? index() : m_outer; } |
| 49 | |
| 50 | EIGEN_STRONG_INLINE operator bool() const { return m_inner < m_end && m_inner>=0; } |
| 51 | |
| 52 | protected: |
| 53 | const Derived& m_expression; |
| 54 | Index m_inner; |
| 55 | const Index m_outer; |
| 56 | const Index m_end; |
| 57 | }; |
| 58 | |
| 59 | } // end namespace Eigen |
| 60 | |
| 61 | #endif // EIGEN_COREITERATORS_H |