DtVirtualBaseClassCustomCreator.h

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/******************************************************************************
 * Copyright (c) 2021 MAK Technologies, Inc.
 * All rights reserved.
 ******************************************************************************/
 
#pragma once

#include <vrvCore/vrvCore.h>
#include <vrvCore/DtDe.h>

namespace makVrv
{
   template<class CustomClassToCreate, class BaseCreatorClass, class ...ConstructorArgs>
   class DtVirtualBaseClassCustomCreator : public BaseCreatorClass
   {
      //std::remove_reference_t is C++14
      //This defines the class that the original creator created. DtSilverliningGroup would be class from the example above
      typedef std::remove_reference_t<decltype((*BaseCreatorClass::classToCreateType))> BaseOfClassToCreate;

   public:

      virtual ~DtVirtualBaseClassCustomCreator()
      {
         //nop
      }

      DtVirtualBaseClassCustomCreator() = delete;
      DtVirtualBaseClassCustomCreator(const DtVirtualBaseClassCustomCreator& other) = delete;
      DtVirtualBaseClassCustomCreator& operator=(const DtVirtualBaseClassCustomCreator& other) = delete;

   protected:
      DtVirtualBaseClassCustomCreator(DtDe& de)
         : BaseCreatorClass(de)
      {
         //nop
      }

   public:
      static void registerInstance(DtDe& de)
      {
         std::string creatorType = creatorTypeName< BaseOfClassToCreate >();
         BaseCreatorClass* inst = new DtVirtualBaseClassCustomCreator<CustomClassToCreate, BaseCreatorClass, ConstructorArgs...>(de);
         de.registerInstance(creatorType, inst);
      }

   public:

      virtual BaseOfClassToCreate* create(ConstructorArgs&&... constructorArgs) override
      {
         //Perfect forwarding of the ConstructorArgs
         //Make sure to use this->myDe to access myDe from the base class in this class. See MAK coding standard for explaination.
         return new CustomClassToCreate(this->myDe, std::forward<ConstructorArgs>(constructorArgs)...);
      }

   };

}