larsim/larsim/EventWeight/Base/WeightCalcCreator.h

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#ifndef _WEIGHTCALCCREATOR_H_
#define _WEIGHTCALCCREATOR_H_

#include <iostream>
#include <string>

namespace evwgh {
  class WeightCalc;

  class WeightCalcCreator
  {
  public:
    WeightCalcCreator(const std::string& classname);
    virtual ~WeightCalcCreator() = default;

    virtual WeightCalc* Create() = 0;
  };

  template <class T>
    class WeightCalcImpl : public WeightCalcCreator
  {
  public:
    WeightCalcImpl<T>(const std::string& classname) : WeightCalcCreator(classname) {std::cout << __PRETTY_FUNCTION__ << " called." << std::endl;}
    virtual ~WeightCalcImpl<T>() {}
    virtual WeightCalc* Create() { return new T; }
  };

#define DECLARE_WEIGHTCALC(wghcalc)             \
  private:                                      \
    static const WeightCalcImpl<wghcalc> creator;

#define REGISTER_WEIGHTCALC(wghcalc)            \
  const WeightCalcImpl<wghcalc> wghcalc::creator(#wghcalc);
}

#endif // _WEIGHTCALCFACTORY_H_