precond.h

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/*
 *
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  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 program 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef precond_h
#define precond_h
 
#include "oofemenv.h"
#include "floatarray.h"
#include "sparsemtrx.h"
#include "inputrecord.h"
 
namespace oofem {
class OOFEM_EXPORT Preconditioner
{
public:
    Preconditioner(const SparseMtrx & a, InputRecord & attributes);
    Preconditioner() { }
    virtual ~Preconditioner(void) { }

    virtual void init(const SparseMtrx &a) { }

    FloatArray solve(const FloatArray &rhs) const {
        FloatArray y;
        this->solve(rhs, y);
        return y;
    }

    FloatArray trans_solve(const FloatArray &rhs) const {
        FloatArray y;
        this->trans_solve(rhs, y);
        return y;
    }

    virtual void solve(const FloatArray &rhs, FloatArray &solution) const = 0;
    virtual void trans_solve(const FloatArray &rhs, FloatArray &solution) const = 0;

    virtual const char *giveClassName() const { return "Preconditioner"; }
    virtual void initializeFrom(InputRecord &ir) { }
};
} // end namespace oofem
#endif // precond_h