EvtGenModelRegister.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <list>
#include <vector>
 
class EvtDecayBase;
 
namespace Belle2 {
  class EvtGenModelRegister {
  public:
    typedef EvtDecayBase* ModelFactory();
 
    template<class MODEL> class Factory {
    public:
      Factory()
      {
        EvtGenModelRegister::registerModel(factory);
      }
      static EvtDecayBase* factory()
      {
        return new MODEL();
      }
    };
 
    static void registerModel(ModelFactory* factory)
    {
      getInstance().m_models.push_back(factory);
    }
 
    static std::list<EvtDecayBase*> getModels();
 
  private:
 
    EvtGenModelRegister() {};
 
    EvtGenModelRegister(const EvtGenModelRegister& other) = delete;
    EvtGenModelRegister& operator=(const EvtGenModelRegister&) = delete;
 
    static EvtGenModelRegister& getInstance();
 
    std::vector<ModelFactory*> m_models;
  };
 
#define B2_EVTGEN_REGISTER_MODEL(classname) namespace {\
    Belle2::EvtGenModelRegister::Factory<classname> EvtGenModelFactory_##classname; \
  }
 
} //Belle2 namespace