EvtAmplitude.hh

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/*******************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenBase
 *    File: $Id: EvtAmplitude.hh,v 1.1.1.2 2007/10/26 05:03:14 pingrg Exp $
 *  Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
 *
 * Copyright (C) 2002 Caltech
 *******************************************************************************/
 
// Complex-valued amplitude
 
#ifndef EVT_AMPLITUDE_HH
#define EVT_AMPLITUDE_HH
 
#include "EvtGenBase/EvtComplex.hh"
 
template <class T>
class EvtAmplitude {
public:
 
  EvtAmplitude() {}
  EvtAmplitude(const EvtAmplitude&) {}
  virtual ~EvtAmplitude() {}
  virtual EvtAmplitude<T>* clone() const = 0;
 
  EvtComplex evaluate(const T& p) const
  {
    EvtComplex ret(0.,0.);
    if(p.isValid()) ret = amplitude(p);
    return ret;
  }
 
protected:
 
  // Derive in subclasses to define amplitude computation
  // for a fully constructed amplitude object. 
  
  virtual EvtComplex amplitude(const T&) const = 0;
 
}; 
 
#endif