Register an object creator in object factory

Question

I have the convenient object factory template that creates objects by their type id names. The implementation is pretty obvious: ObjectFactory contains the map

Answer 1

Cygon's answer is probably what you need, but you also might get away with lazy registration, depending what exacly is registration for.

Move registration into special base class and attach that besides interface in the macro.

Inside constructor use a local static flag, so that each class registers only once on first instanse creation.

Probably won't compile, but you should get what I meant:

template
class RegistratorBase
{
public:
     RegistratorBase()
     {
          static bool registered = false;
          if(!registered)
                ObjectFactory::GetInstance().Register();
     }
};

#define REGISTER_CLASS(className, interfaceName) \
  class className : public interfaceName, private RegistratorBase