2014 Eurobot fork
Dependencies: mbed-rtos mbed QEI
Diff: tvmet/xpr/Eval.h
- Revision:
- 15:9c5aaeda36dc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tvmet/xpr/Eval.h Sat Apr 06 20:57:54 2013 +0000 @@ -0,0 +1,116 @@ +/* + * 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: Eval.h,v 1.13 2007-06-23 15:58:59 opetzold Exp $ + */ + +#ifndef TVMET_XPR_EVAL_H +#define TVMET_XPR_EVAL_H + +namespace tvmet { + + +/** + * \class XprEval Eval.h "tvmet/xpr/Eval.h" + * \brief evaluate the expression + * + * Since we can't overwrite the ? operator we have to write a wrapper + * for expression like return v1>v2 ? true : false + */ +template<class E1, class E2, class E3> +class XprEval + : public TvmetBase< XprEval<E1, E2, E3> > +{ +public: + typedef E1 expr1_type; + typedef E2 expr2_type; + typedef E3 expr3_type; + + typedef typename expr2_type::value_type value2_type; + typedef typename expr3_type::value_type value3_type; + + typedef typename + PromoteTraits<value2_type, value3_type>::value_type value_type; + +public: + /** Complexity Counter */ + enum { + ops_expr1 = E1::ops, + ops_expr2 = E2::ops, + ops_expr3 = E3::ops, + ops = ops_expr1 // only (e1 op e2) are evaluated + }; + +private: + XprEval(); + XprEval& operator=(const XprEval<expr1_type, expr2_type, expr3_type>&); + +public: + /** Constructor */ + explicit XprEval(const expr1_type& e1, const expr2_type& e2, const expr3_type& e3) + : m_expr1(e1), m_expr2(e2), m_expr3(e3) + { } + + /** Copy Constructor. Not explicit! */ +#if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR) + XprEval(const XprEval& rhs) + : m_expr1(rhs.m_expr1), m_expr2(rhs.m_expr2), m_expr3(rhs.m_expr3) + { } +#endif + +public: //access + /** index operator for vectors. */ + value_type operator()(std::size_t i) const { + return m_expr1(i) ? m_expr2(i) : m_expr3(i); + } + + /** index operator for matrizes. */ + value_type operator()(std::size_t i, std::size_t j) const { + return m_expr1(i, j) ? m_expr2(i, j) : m_expr3(i, j); + } + +public: // debugging Xpr parse tree + void print_xpr(std::ostream& os, std::size_t l=0) const { + os << IndentLevel(l++) + << "XprEval[" << ops << ", (" + << ops_expr1 << ", " << ops_expr2 << ", " << ops_expr3 << ")]<" + << std::endl; + m_expr1.print_xpr(os, l); + m_expr2.print_xpr(os, l); + m_expr3.print_xpr(os, l); + os << IndentLevel(--l) + << ">," << std::endl; + } + +private: + const expr1_type m_expr1; + const expr2_type m_expr2; + const expr3_type m_expr3; +}; + + +} // namespace tvmet + +#endif // TVMET_XPR_EVAL_H + +// Local Variables: +// mode:C++ +// tab-width:8 +// End: