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-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra.
-//
-// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-#ifndef EIGEN_NOALIAS_H
-#define EIGEN_NOALIAS_H
-
-namespace Eigen {
-
-/** \class NoAlias
- * \ingroup Core_Module
- *
- * \brief Pseudo expression providing an operator = assuming no aliasing
- *
- * \param ExpressionType the type of the object on which to do the lazy assignment
- *
- * This class represents an expression with special assignment operators
- * assuming no aliasing between the target expression and the source expression.
- * More precisely it alloas to bypass the EvalBeforeAssignBit flag of the source expression.
- * It is the return type of MatrixBase::noalias()
- * and most of the time this is the only way it is used.
- *
- * \sa MatrixBase::noalias()
- */
-template<typename ExpressionType, template <typename> class StorageBase>
-class NoAlias
-{
- typedef typename ExpressionType::Scalar Scalar;
- public:
- NoAlias(ExpressionType& expression) : m_expression(expression) {}
-
- /** Behaves like MatrixBase::lazyAssign(other)
- * \sa MatrixBase::lazyAssign() */
- template<typename OtherDerived>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator=(const StorageBase<OtherDerived>& other)
- { return internal::assign_selector<ExpressionType,OtherDerived,false>::run(m_expression,other.derived()); }
-
- /** \sa MatrixBase::operator+= */
- template<typename OtherDerived>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator+=(const StorageBase<OtherDerived>& other)
- {
- typedef SelfCwiseBinaryOp<internal::scalar_sum_op<Scalar>, ExpressionType, OtherDerived> SelfAdder;
- SelfAdder tmp(m_expression);
- typedef typename internal::nested<OtherDerived>::type OtherDerivedNested;
- typedef typename internal::remove_all<OtherDerivedNested>::type _OtherDerivedNested;
- internal::assign_selector<SelfAdder,_OtherDerivedNested,false>::run(tmp,OtherDerivedNested(other.derived()));
- return m_expression;
- }
-
- /** \sa MatrixBase::operator-= */
- template<typename OtherDerived>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator-=(const StorageBase<OtherDerived>& other)
- {
- typedef SelfCwiseBinaryOp<internal::scalar_difference_op<Scalar>, ExpressionType, OtherDerived> SelfAdder;
- SelfAdder tmp(m_expression);
- typedef typename internal::nested<OtherDerived>::type OtherDerivedNested;
- typedef typename internal::remove_all<OtherDerivedNested>::type _OtherDerivedNested;
- internal::assign_selector<SelfAdder,_OtherDerivedNested,false>::run(tmp,OtherDerivedNested(other.derived()));
- return m_expression;
- }
-
-#ifndef EIGEN_PARSED_BY_DOXYGEN
- template<typename ProductDerived, typename Lhs, typename Rhs>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator+=(const ProductBase<ProductDerived, Lhs,Rhs>& other)
- { other.derived().addTo(m_expression); return m_expression; }
-
- template<typename ProductDerived, typename Lhs, typename Rhs>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator-=(const ProductBase<ProductDerived, Lhs,Rhs>& other)
- { other.derived().subTo(m_expression); return m_expression; }
-
- template<typename Lhs, typename Rhs, int NestingFlags>
- EIGEN_STRONG_INLINE ExpressionType& operator+=(const CoeffBasedProduct<Lhs,Rhs,NestingFlags>& other)
- { return m_expression.derived() += CoeffBasedProduct<Lhs,Rhs,NestByRefBit>(other.lhs(), other.rhs()); }
-
- template<typename Lhs, typename Rhs, int NestingFlags>
- EIGEN_DEVICE_FUNC
- EIGEN_STRONG_INLINE ExpressionType& operator-=(const CoeffBasedProduct<Lhs,Rhs,NestingFlags>& other)
- { return m_expression.derived() -= CoeffBasedProduct<Lhs,Rhs,NestByRefBit>(other.lhs(), other.rhs()); }
-
- template<typename OtherDerived>
- ExpressionType& operator=(const ReturnByValue<OtherDerived>& func)
- { return m_expression = func; }
-#endif
-
- EIGEN_DEVICE_FUNC
- ExpressionType& expression() const
- {
- return m_expression;
- }
-
- protected:
- ExpressionType& m_expression;
-};
-
-/** \returns a pseudo expression of \c *this with an operator= assuming
- * no aliasing between \c *this and the source expression.
- *
- * More precisely, noalias() allows to bypass the EvalBeforeAssignBit flag.
- * Currently, even though several expressions may alias, only product
- * expressions have this flag. Therefore, noalias() is only usefull when
- * the source expression contains a matrix product.
- *
- * Here are some examples where noalias is usefull:
- * \code
- * D.noalias() = A * B;
- * D.noalias() += A.transpose() * B;
- * D.noalias() -= 2 * A * B.adjoint();
- * \endcode
- *
- * On the other hand the following example will lead to a \b wrong result:
- * \code
- * A.noalias() = A * B;
- * \endcode
- * because the result matrix A is also an operand of the matrix product. Therefore,
- * there is no alternative than evaluating A * B in a temporary, that is the default
- * behavior when you write:
- * \code
- * A = A * B;
- * \endcode
- *
- * \sa class NoAlias
- */
-template<typename Derived>
-NoAlias<Derived,MatrixBase> MatrixBase<Derived>::noalias()
-{
- return derived();
-}
-
-} // end namespace Eigen
-
-#endif // EIGEN_NOALIAS_H