UserHooksFactory.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef GENERATOR_PYTHIA8_USER_HOOKS_FACTORY_H
#define GENERATOR_PYTHIA8_USER_HOOKS_FACTORY_H
 
#include "Pythia8/Pythia.h"
#include "Pythia8/UserHooks.h"
 
#include <string>
#include <map>
 
#define PYTHIA8_PTRWRAP(A) A
#define PYTHIA8_INITUSERHOOK_WRAP(A) A->initPtr(infoPtr, settingsPtr, particleDataPtr, rndmPtr, beamAPtr, beamBPtr, beamPomAPtr, beamPomBPtr, coupSMPtr, partonSystemsPtr, sigmaTotPtr)
#ifdef PYTHIA_VERSION_INTEGER
    #define PYTHIA8_3SERIES
    #if PYTHIA_VERSION_INTEGER > 8303
      #define PYTHIA8_304SERIES
    #endif
    typedef std::shared_ptr<Pythia8::UserHooks> UserHooksPtrType;
    #undef PYTHIA8_PTRWRAP
    #define PYTHIA8_PTRWRAP(A) std::shared_ptr<Pythia8::UserHooks>(A)
    #undef PYTHIA8_INITUSERHOOK_WRAP
    #define PYTHIA8_INITUSERHOOK_WRAP(A) registerSubObject(*A)
#else
  typedef Pythia8::UserHooks* UserHooksPtrType;
#endif
 
namespace Pythia8_UserHooks{
 
  using Pythia8::UserHooks;
 
 
  class UserHooksFactory{
 
  public:
 
    static UserHooks *create(const std::string &hookName);
 
  private:
 
    UserHooksFactory(){};
 
    class ICreator{
    public:
      virtual UserHooks *create() const = 0;
      virtual ~ICreator(){};
    };
 
  public:
 
    template <class T>
    class Creator: public ICreator{
 
    public:
 
      Creator(const std::string &name){
        m_name = name;
        UserHooksFactory::s_creators()[name] = this;
      }
 
      ~Creator(){
        if(s_creators()[m_name] == this){
          s_creators().erase(m_name);
        }
      }
 
      UserHooks *create()const{
        return new T;
      }
 
    private:
 
      std::string m_name;
    };
 
    template<typename T>
    static std::map<std::string, T> &userSettings();
 
    static std::map<std::string, double> &userParams();
    static std::map<std::string, int> &userModes();
    static std::map<std::string, std::string> &userWords();
 
  private:
 
    static std::map<std::string, const ICreator*> &s_creators();
 
  };
 
 
}
 
 
#endif