#include "ComponentManager.h"
class Object{
    public:
      Object() : componentManager(*this){}
     /*
         Many public things
     */
    private:
       ComponentManager componentManager;
};

class Object;

class ComponentManager{
    public:
     ComponentManager(Object& _object) : object(_object){}

     template<class T> T& function1(...) 
     /*
        Many templated function that force me to write declaration in this .h file
     */
    private:
      Object& object;
}

template <class T> T& CreateComponent(bool active, int position){
/*
   Working code
*/
Object& obj = object.GetScene().GetObjectManager().GetObjects()[i];  //This line is problematic
/*
   Working code
*/
}

for(int i = 0; i <  object.GetScene().GetObjectManager().GetObjectsCount(); i++){
	Object& obj = object.GetScene().GetObjectManager().GetObjects()[i];
	if(&obj != &object){
		if(obj.GetComponentManager().HasComponent<T>()){
			throw Exc("...");
		}
	}
}