mirror of
https://gitlab.com/libeigen/eigen.git
synced 2026-04-10 11:34:33 +08:00
3036eeca0a
release of tvmet (inactive for 2 years and developer unreachable) as the basis for eigen2, because it provides seemingly good expression template mechanisms, we want that, and it would take years to reinvent that wheel. We'll see. So this commit imports the last tvmet release.
128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
/*
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* Tiny Vector Matrix Library
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* Dense Vector Matrix Libary of Tiny size using Expression Templates
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*
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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*
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* This library 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 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser 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 along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: AliasProxy.h,v 1.4 2004/06/10 16:36:55 opetzold Exp $
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*/
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#ifndef TVMET_ALIAS_PROXY_H
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#define TVMET_ALIAS_PROXY_H
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namespace tvmet {
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/** forwards */
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template<class E> class AliasProxy;
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/**
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* \brief Simplify syntax for alias Matrices and Vectors,
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* where aliasing left hand values appear in the
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* expression.
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* \par Example:
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* \code
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* typedef tvmet::Matrix<double, 10, 10> matrix_type;
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* matrix_type m;
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* ...
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* alias(m) += trans(m);
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* \endcode
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* \sa AliasProxy
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* \sa Some Notes \ref alias
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*/
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template<class E>
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AliasProxy<E> alias(E& expr) { return AliasProxy<E>(expr); }
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/**
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* \class AliasProxy AliasProxy.h "tvmet/AliasProxy.h"
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* \brief Assign proxy for alias Matrices and Vectors.
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*
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* A short lived object to provide simplified alias syntax.
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* Only the friend function alias is allowed to create
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* such a object. The proxy calls the appropriate member
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* alias_xyz() which have to use temporaries to avoid
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* overlapping memory regions.
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* \sa alias
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* \sa Some Notes \ref alias
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* \note Thanks to ublas-dev group, where the principle idea
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* comes from.
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*/
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template<class E>
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class AliasProxy
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{
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AliasProxy(const AliasProxy&);
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AliasProxy& operator=(const AliasProxy&);
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friend AliasProxy<E> alias<>(E& expr);
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public:
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AliasProxy(E& expr) : m_expr(expr) { }
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template<class E2>
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E& operator=(const E2& expr) {
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return m_expr.alias_assign(expr);
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}
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template<class E2>
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E& operator+=(const E2& expr) {
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return m_expr.alias_add_eq(expr);
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}
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template<class E2>
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E& operator-=(const E2& expr) {
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return m_expr.alias_sub_eq(expr);
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}
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template<class E2>
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E& operator*=(const E2& expr) {
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return m_expr.alias_mul_eq(expr);
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}
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template<class E2>
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E& operator/=(const E2& expr) {
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return m_expr.alias_div_eq(expr);
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}
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private:
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E& m_expr;
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};
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#if 0
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namespace element_wise {
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// \todo to write
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template<class E, class E2>
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E& operator/=(AliasProxy<E>& proxy, const E2& rhs) {
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return proxy.div_upd(rhs);
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}
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}
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#endif
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} // namespace tvmet
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#endif /* TVMET_ALIAS_PROXY_H */
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// Local Variables:
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// mode:C++
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// End:
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