| /* |
| * Tiny Vector Matrix Library |
| * Dense Vector Matrix Libary of Tiny size using Expression Templates |
| * |
| * Copyright (C) 2001 - 2003 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: Null.h,v 1.7 2003/11/30 18:35:17 opetzold Exp $ |
| */ |
| |
| #ifndef TVMET_XPR_NULL_H |
| #define TVMET_XPR_NULL_H |
| |
| namespace tvmet { |
| |
| |
| /** |
| * \class XprNull Null.h "tvmet/xpr/Null.h" |
| * \brief Null object design pattern |
| */ |
| class XprNull |
| : public TvmetBase< XprNull > |
| { |
| XprNull& operator=(const XprNull&); |
| |
| public: |
| explicit XprNull() { } |
| |
| public: // debugging Xpr parse tree |
| void print_xpr(std::ostream& os, std::size_t l=0) const { |
| os << IndentLevel(l) << "XprNull[O=0]" << std::endl; |
| } |
| }; |
| |
| |
| #define TVMET_BINARY_OPERATOR(OP) \ |
| template< class T > \ |
| inline \ |
| T operator OP (const T& lhs, XprNull) { return lhs; } |
| |
| TVMET_BINARY_OPERATOR(+) |
| TVMET_BINARY_OPERATOR(-) |
| TVMET_BINARY_OPERATOR(*) |
| TVMET_BINARY_OPERATOR(/) |
| |
| #undef TVMET_BINARY_OPERATOR |
| |
| |
| } // namespace tvmet |
| |
| #endif // TVMET_XPR_NULL_H |
| |
| // Local Variables: |
| // mode:C++ |
| // End: |
