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Diff: tvmet/AliasProxy.h
- Revision:
- 15:9c5aaeda36dc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tvmet/AliasProxy.h Sat Apr 06 20:57:54 2013 +0000 @@ -0,0 +1,128 @@ +/* + * Tiny Vector Matrix Library + * Dense Vector Matrix Libary of Tiny size using Expression Templates + * + * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * $Id: AliasProxy.h,v 1.8 2007-06-23 15:58:58 opetzold Exp $ + */ + +#ifndef TVMET_ALIAS_PROXY_H +#define TVMET_ALIAS_PROXY_H + +namespace tvmet { + + +/** forwards */ +template<class E> class AliasProxy; + + +/** + * \brief Simplify syntax for alias Matrices and Vectors, + * where aliasing left hand values appear in the + * expression. + * \par Example: + * \code + * typedef tvmet::Matrix<double, 10, 10> matrix_type; + * matrix_type m; + * ... + * alias(m) += trans(m); + * \endcode + * \sa AliasProxy + * \sa Some Notes \ref alias + */ +template<class E> +AliasProxy<E> alias(E& expr) { return AliasProxy<E>(expr); } + + +/** + * \class AliasProxy AliasProxy.h "tvmet/AliasProxy.h" + * \brief Assign proxy for alias Matrices and Vectors. + * + * A short lived object to provide simplified alias syntax. + * Only the friend function alias is allowed to create + * such a object. The proxy calls the appropriate member + * alias_xyz() which have to use temporaries to avoid + * overlapping memory regions. + * \sa alias + * \sa Some Notes \ref alias + * \note Thanks to ublas-dev group, where the principle idea + * comes from. + */ +template<class E> +class AliasProxy +{ + AliasProxy(const AliasProxy&); + AliasProxy& operator=(const AliasProxy&); + + friend AliasProxy<E> alias<>(E& expr); + +public: + AliasProxy(E& expr) : m_expr(expr) { } + + + template<class E2> + E& operator=(const E2& expr) { + return m_expr.alias_assign(expr); + } + + template<class E2> + E& operator+=(const E2& expr) { + return m_expr.alias_add_eq(expr); + } + + template<class E2> + E& operator-=(const E2& expr) { + return m_expr.alias_sub_eq(expr); + } + + template<class E2> + E& operator*=(const E2& expr) { + return m_expr.alias_mul_eq(expr); + } + + template<class E2> + E& operator/=(const E2& expr) { + return m_expr.alias_div_eq(expr); + } + +private: + E& m_expr; +}; + + +#if 0 +namespace element_wise { +// \todo to write +template<class E, class E2> +E& operator/=(AliasProxy<E>& proxy, const E2& rhs) { + return proxy.div_upd(rhs); +} + +} +#endif + + +} // namespace tvmet + + +#endif /* TVMET_ALIAS_PROXY_H */ + +// Local Variables: +// mode:C++ +// tab-width:8 +// End: