/*************************************************************************************

Grid physics library, www.github.com/paboyle/Grid

Source file: ./lib/qcd/action/ActionBase.h

Copyright (C) 2015-2016

Author: Peter Boyle <paboyle@ph.ed.ac.uk>
Author: neo <cossu@post.kek.jp>
Author: Guido Cossu <guido.cossu@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 ACTION_BASE_H
#define ACTION_BASE_H

NAMESPACE_BEGIN(Grid);

template <class GaugeField >
class Action 
{

public:
  bool is_smeared = false;
  // Heatbath?
  virtual void refresh(const GaugeField& U, GridParallelRNG& pRNG) = 0; // refresh pseudofermions
  virtual RealD S(const GaugeField& U) = 0;                             // evaluate the action
  virtual void deriv(const GaugeField& U, GaugeField& dSdU) = 0;        // evaluate the action derivative
  virtual std::string action_name()    = 0;                             // return the action name
  virtual std::string LogParameters()  = 0;                             // prints action parameters
  virtual ~Action(){}
};

NAMESPACE_END(Grid);

#endif // ACTION_BASE_H