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/*
* 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, int 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:
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