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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: MatrixDiag.h,v 1.13 2004/09/16 09:14:18 opetzold Exp $
*/
#include <cassert>
#ifndef TVMET_XPR_MATRIX_DIAG_H
#define TVMET_XPR_MATRIX_DIAG_H
namespace tvmet {
/**
* \class XprMatrixDiag MatrixDiag.h "tvmet/xpr/MatrixDiag.h"
* \brief Expression on matrix used for access on the diagonal vector.
*/
template<class E, int Sz>
class XprMatrixDiag
: public TvmetBase< XprMatrixDiag<E, Sz> >
{
XprMatrixDiag();
XprMatrixDiag& operator=(const XprMatrixDiag<E, Sz>&);
public:
typedef typename E::value_type value_type;
public:
/** Complexity counter. */
enum {
ops_expr = E::ops,
ops = ops_expr/Sz
};
public:
/** Constructor. */
explicit XprMatrixDiag(const E& e)
: m_expr(e)
{ }
/** Copy Constructor. Not explicit! */
#if defined(TVMET_OPTIMIZE_XPR_MANUAL_CCTOR)
XprMatrixDiag(const XprMatrixDiag& e)
: m_expr(e.m_expr)
{ }
#endif
/** index operator for arrays/matrizes */
value_type operator()(int i) const {
assert(i < Sz);
return m_expr(i, i);
}
public: // debugging Xpr parse tree
void print_xpr(std::ostream& os, int l=0) const {
os << IndentLevel(l++)
<< "XprMatrixDiag[O=" << ops << ", (O=" << ops_expr << ")]<"
<< std::endl;
m_expr.print_xpr(os, l);
os << IndentLevel(l)
<< "Sz=" << Sz << std::endl
<< IndentLevel(--l) << ">"
<< ((l != 0) ? "," : "") << std::endl;
}
private:
const E m_expr;
};
} // namespace tvmet
#endif // TVMET_XPR_MATRIX_DIAG_H
// Local Variables:
// mode:C++
// End:
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