ObjectExtensions.h

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//==========================================================================
//  AIDA Detector description implementation for LCD
//--------------------------------------------------------------------------
// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
// All rights reserved.
//
// For the licensing terms see $DD4hepINSTALL/LICENSE.
// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
//
// Author     : M.Frank
//
//==========================================================================
#ifndef DD4HEP_GEOMETRY_OBJECTEXTENSIONS_H
#define DD4HEP_GEOMETRY_OBJECTEXTENSIONS_H

// C/C++ include files
#include <typeinfo>
#include <map>

namespace DD4hep {


  class ObjectExtensions   {
  public:
    typedef std::map<const std::type_info*, void*> Extensions;
    typedef void* (*copy_t)(const void*, void* arg);
    typedef void (*destruct_t)(void*);
    struct Entry {
      copy_t copy;
      destruct_t destruct;
      int id;
    };
    typedef std::map<const std::type_info*, Entry> ExtensionMap;

    Extensions    extensions; 
    ExtensionMap* extensionMap; 

    static void _noDelete(void*) {}

    template <typename T> static void _delete(void* ptr) {
      delete (T*) (ptr);
    }

  public:
    ObjectExtensions(const std::type_info& parent_type);
    ObjectExtensions(const ObjectExtensions& copy) = delete;
    virtual ~ObjectExtensions();
    ObjectExtensions& operator=(const ObjectExtensions& copy) = delete;
    void move(ObjectExtensions& copy);
    void clear(bool destroy=true);
    void copyFrom(const Extensions& ext, void* arg);
    void* addExtension(void* ptr, const std::type_info& info, copy_t ctor, destruct_t dtor);
    void* addExtension(void* ptr, const std::type_info& info, destruct_t dtor);
    void* removeExtension(const std::type_info& info, bool destroy);
    void* extension(const std::type_info& info, bool alert) const;
    void* extension(const std::type_info& info) const;
  };

} /* End namespace DD4hep        */
#endif    /* DD4HEP_GEOMETRY_OBJECTEXTENSIONS_H */