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tvmet/xpr/Eval.h
- Committer:
- madcowswe
- Date:
- 2013-04-17
- Revision:
- 90:e4164bb8c60e
- Parent:
- 15:9c5aaeda36dc
File content as of revision 90:e4164bb8c60e:
/* * 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: