1 // This file is part of Eigen, a lightweight C++ template library 2 // for linear algebra. 3 // 4 // Copyright (C) 2009 Benoit Jacob <jacob.benoit.1 (at) gmail.com> 5 // Copyright (C) 2009 Gael Guennebaud <gael.guennebaud (at) inria.fr> 6 // 7 // This Source Code Form is subject to the terms of the Mozilla 8 // Public License v. 2.0. If a copy of the MPL was not distributed 9 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 10 11 #ifndef EIGEN_EIGENBASE_H 12 #define EIGEN_EIGENBASE_H 13 14 namespace Eigen { 15 16 /** Common base class for all classes T such that MatrixBase has an operator=(T) and a constructor MatrixBase(T). 17 * 18 * In other words, an EigenBase object is an object that can be copied into a MatrixBase. 19 * 20 * Besides MatrixBase-derived classes, this also includes special matrix classes such as diagonal matrices, etc. 21 * 22 * Notice that this class is trivial, it is only used to disambiguate overloaded functions. 23 * 24 * \sa \ref TopicClassHierarchy 25 */ 26 template<typename Derived> struct EigenBase 27 { 28 // typedef typename internal::plain_matrix_type<Derived>::type PlainObject; 29 30 typedef typename internal::traits<Derived>::StorageKind StorageKind; 31 typedef typename internal::traits<Derived>::Index Index; 32 33 /** \returns a reference to the derived object */ 34 Derived& derived() { return *static_cast<Derived*>(this); } 35 /** \returns a const reference to the derived object */ 36 const Derived& derived() const { return *static_cast<const Derived*>(this); } 37 38 inline Derived& const_cast_derived() const 39 { return *static_cast<Derived*>(const_cast<EigenBase*>(this)); } 40 inline const Derived& const_derived() const 41 { return *static_cast<const Derived*>(this); } 42 43 /** \returns the number of rows. \sa cols(), RowsAtCompileTime */ 44 inline Index rows() const { return derived().rows(); } 45 /** \returns the number of columns. \sa rows(), ColsAtCompileTime*/ 46 inline Index cols() const { return derived().cols(); } 47 /** \returns the number of coefficients, which is rows()*cols(). 48 * \sa rows(), cols(), SizeAtCompileTime. */ 49 inline Index size() const { return rows() * cols(); } 50 51 /** \internal Don't use it, but do the equivalent: \code dst = *this; \endcode */ 52 template<typename Dest> inline void evalTo(Dest& dst) const 53 { derived().evalTo(dst); } 54 55 /** \internal Don't use it, but do the equivalent: \code dst += *this; \endcode */ 56 template<typename Dest> inline void addTo(Dest& dst) const 57 { 58 // This is the default implementation, 59 // derived class can reimplement it in a more optimized way. 60 typename Dest::PlainObject res(rows(),cols()); 61 evalTo(res); 62 dst += res; 63 } 64 65 /** \internal Don't use it, but do the equivalent: \code dst -= *this; \endcode */ 66 template<typename Dest> inline void subTo(Dest& dst) const 67 { 68 // This is the default implementation, 69 // derived class can reimplement it in a more optimized way. 70 typename Dest::PlainObject res(rows(),cols()); 71 evalTo(res); 72 dst -= res; 73 } 74 75 /** \internal Don't use it, but do the equivalent: \code dst.applyOnTheRight(*this); \endcode */ 76 template<typename Dest> inline void applyThisOnTheRight(Dest& dst) const 77 { 78 // This is the default implementation, 79 // derived class can reimplement it in a more optimized way. 80 dst = dst * this->derived(); 81 } 82 83 /** \internal Don't use it, but do the equivalent: \code dst.applyOnTheLeft(*this); \endcode */ 84 template<typename Dest> inline void applyThisOnTheLeft(Dest& dst) const 85 { 86 // This is the default implementation, 87 // derived class can reimplement it in a more optimized way. 88 dst = this->derived() * dst; 89 } 90 91 }; 92 93 /*************************************************************************** 94 * Implementation of matrix base methods 95 ***************************************************************************/ 96 97 /** \brief Copies the generic expression \a other into *this. 98 * 99 * \details The expression must provide a (templated) evalTo(Derived& dst) const 100 * function which does the actual job. In practice, this allows any user to write 101 * its own special matrix without having to modify MatrixBase 102 * 103 * \returns a reference to *this. 104 */ 105 template<typename Derived> 106 template<typename OtherDerived> 107 Derived& DenseBase<Derived>::operator=(const EigenBase<OtherDerived> &other) 108 { 109 other.derived().evalTo(derived()); 110 return derived(); 111 } 112 113 template<typename Derived> 114 template<typename OtherDerived> 115 Derived& DenseBase<Derived>::operator+=(const EigenBase<OtherDerived> &other) 116 { 117 other.derived().addTo(derived()); 118 return derived(); 119 } 120 121 template<typename Derived> 122 template<typename OtherDerived> 123 Derived& DenseBase<Derived>::operator-=(const EigenBase<OtherDerived> &other) 124 { 125 other.derived().subTo(derived()); 126 return derived(); 127 } 128 129 } // end namespace Eigen 130 131 #endif // EIGEN_EIGENBASE_H 132
