QMCThreeBodyCorrelationFunction.h

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//            QMcBeaver
//
//         Constructed by 
//
//     Michael Todd Feldmann 
//              and 
//   David Randall "Chip" Kent IV
//
// Copyright 2000.  All rights reserved.
//
// drkent@users.sourceforge.net mtfeldmann@users.sourceforge.net

#ifndef QMCThreeBodyCorrelationFunction_H
#define QMCThreeBodyCorrelationFunction_H

#include "Array1D.h"

class QMCThreeBodyCorrelationFunction
{
 public:
  virtual ~QMCThreeBodyCorrelationFunction(){};

  virtual void initializeParameters(int electron_nucleus, 
                                    int electron_electron, 
                                    Array1D<double> &Parameters,int power, 
                                    double max_dist) = 0;

  virtual bool setElectron(bool first, Array1D<double> &xyz, double dist) = 0;

  virtual void evaluate(Array1D<double> &xyz12, double r12) = 0;
  
  virtual double getFunctionValue() = 0;

  virtual double getFunctionValue(double r12, double r1, double r2) = 0;

  virtual double get_p_a(int ai) = 0;
  
  virtual Array1D<double> * getElectron1Gradient() = 0;

  virtual Array1D<double> * getElectron2Gradient() = 0;

  virtual double get_p2_xa(bool e1, int xyz, int ai) = 0;
  
  virtual double getLaplacianValue() = 0;

  virtual double get_p3_xxa(int ai) = 0;

  virtual double getCutoffDist() = 0;

  virtual void print(ostream& strm){}
};


#endif

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