Preconditioner.h

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/*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/algorithms/Preconditioner.h
 
    Copyright (C) 2015
 
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 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 General Public License for more details.
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
#ifndef GRID_PRECONDITIONER_H
#define GRID_PRECONDITIONER_H
 
NAMESPACE_BEGIN(Grid);
 
template<class Field> using Preconditioner =  LinearFunction<Field> ;
 
/*
template<class Field> class Preconditioner :  public LinearFunction<Field> {
  using LinearFunction<Field>::operator();
  virtual void operator()(const Field &src, Field & psi)=0;
};
*/
 
template<class Field> class TrivialPrecon :  public Preconditioner<Field> { 
public:
  using Preconditioner<Field>::operator();
  virtual void operator()(const Field &src, Field & psi){
    psi = src;
  }
  TrivialPrecon(void){};
};
 
NAMESPACE_END(Grid);
#endif