McEnergyPerturbation.h

#ifdef  MCMD_PERTURB
#ifndef MCMD_MC_ENERGY_PERTURBATION_H
#define MCMD_MC_ENERGY_PERTURBATION_H

/*
* Simpatico - Simulation Package for Polymeric and Molecular Liquids
*
* Copyright 2010 - 2017, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/

#include <mcMd/perturb/LinearPerturbation.h>

namespace McMd
{

   class McSystem;

   class McEnergyPerturbation : public LinearPerturbation<McSystem>
   {

   public:
  
      McEnergyPerturbation(McSystem& system, int size, int rank);
  
      virtual void readParameters(std::istream& in);
 
      virtual void setParameter();

      virtual double parameter(int i) const;

      virtual double derivative(int i) const;

   private:  

      /*
      Number of perturbation parameters associated with a System.
      nParameters = 1 for McEnergyPerturbation.
      */
      int nParameters_;

   };

}
#endif  // ifndef ENERGY_PERTURBATION_H
#endif  // ifdef MCMD_PERTURB