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00001 // This file is part of Eigen, a lightweight C++ template library 00002 // for linear algebra. 00003 // 00004 // Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr> 00005 // 00006 // This Source Code Form is subject to the terms of the Mozilla 00007 // Public License v. 2.0. If a copy of the MPL was not distributed 00008 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 00009 00010 #ifndef EIGEN_NOALIAS_H 00011 #define EIGEN_NOALIAS_H 00012 00013 namespace Eigen { 00014 00030 template<typename ExpressionType, template <typename> class StorageBase> 00031 class NoAlias 00032 { 00033 typedef typename ExpressionType::Scalar Scalar; 00034 public: 00035 NoAlias(ExpressionType& expression) : m_expression(expression) {} 00036 00039 template<typename OtherDerived> 00040 EIGEN_STRONG_INLINE ExpressionType& operator=(const StorageBase<OtherDerived>& other) 00041 { return internal::assign_selector<ExpressionType,OtherDerived,false>::run(m_expression,other.derived()); } 00042 00044 template<typename OtherDerived> 00045 EIGEN_STRONG_INLINE ExpressionType& operator+=(const StorageBase<OtherDerived>& other) 00046 { 00047 typedef SelfCwiseBinaryOp<internal::scalar_sum_op<Scalar>, ExpressionType, OtherDerived> SelfAdder; 00048 SelfAdder tmp(m_expression); 00049 typedef typename internal::nested<OtherDerived>::type OtherDerivedNested; 00050 typedef typename internal::remove_all<OtherDerivedNested>::type _OtherDerivedNested; 00051 internal::assign_selector<SelfAdder,_OtherDerivedNested,false>::run(tmp,OtherDerivedNested(other.derived())); 00052 return m_expression; 00053 } 00054 00056 template<typename OtherDerived> 00057 EIGEN_STRONG_INLINE ExpressionType& operator-=(const StorageBase<OtherDerived>& other) 00058 { 00059 typedef SelfCwiseBinaryOp<internal::scalar_difference_op<Scalar>, ExpressionType, OtherDerived> SelfAdder; 00060 SelfAdder tmp(m_expression); 00061 typedef typename internal::nested<OtherDerived>::type OtherDerivedNested; 00062 typedef typename internal::remove_all<OtherDerivedNested>::type _OtherDerivedNested; 00063 internal::assign_selector<SelfAdder,_OtherDerivedNested,false>::run(tmp,OtherDerivedNested(other.derived())); 00064 return m_expression; 00065 } 00066 00067 #ifndef EIGEN_PARSED_BY_DOXYGEN 00068 template<typename ProductDerived, typename Lhs, typename Rhs> 00069 EIGEN_STRONG_INLINE ExpressionType& operator+=(const ProductBase<ProductDerived, Lhs,Rhs>& other) 00070 { other.derived().addTo(m_expression); return m_expression; } 00071 00072 template<typename ProductDerived, typename Lhs, typename Rhs> 00073 EIGEN_STRONG_INLINE ExpressionType& operator-=(const ProductBase<ProductDerived, Lhs,Rhs>& other) 00074 { other.derived().subTo(m_expression); return m_expression; } 00075 00076 template<typename Lhs, typename Rhs, int NestingFlags> 00077 EIGEN_STRONG_INLINE ExpressionType& operator+=(const CoeffBasedProduct<Lhs,Rhs,NestingFlags>& other) 00078 { return m_expression.derived() += CoeffBasedProduct<Lhs,Rhs,NestByRefBit>(other.lhs(), other.rhs()); } 00079 00080 template<typename Lhs, typename Rhs, int NestingFlags> 00081 EIGEN_STRONG_INLINE ExpressionType& operator-=(const CoeffBasedProduct<Lhs,Rhs,NestingFlags>& other) 00082 { return m_expression.derived() -= CoeffBasedProduct<Lhs,Rhs,NestByRefBit>(other.lhs(), other.rhs()); } 00083 00084 template<typename OtherDerived> 00085 ExpressionType& operator=(const ReturnByValue<OtherDerived>& func) 00086 { return m_expression = func; } 00087 #endif 00088 00089 ExpressionType& expression() const 00090 { 00091 return m_expression; 00092 } 00093 00094 protected: 00095 ExpressionType& m_expression; 00096 }; 00097 00126 template<typename Derived> 00127 NoAlias<Derived,MatrixBase> MatrixBase<Derived>::noalias() 00128 { 00129 return derived(); 00130 } 00131 00132 } // end namespace Eigen 00133 00134 #endif // EIGEN_NOALIAS_H