C++ dynamic allocation in cocos2d-x

Question

I made a pointer variable, ptr_view, in a main cpp for dynamic allocation to create some views & buttons in the screen.

And sch, this is a common pointer in class_A, class_B ... for indicating main class to access that pointer ptr_view. When the button class_A made get pressed, the function like below is running.

void class_A::ChangeView_B()
{
CC_SAFE_DELETE(sch->ptr_view);
sch->ptr_view = new  class_B;
sch->ptr_view->RCreation(main_view);
}

but this obviously creates an error, I finally got to know why, since the memory of class_A is terminated when CC_SAFE_DELETE is running so 'sch' is no more exist when trying to access sch->ptr_view. But still don't know how to fix this problem. Does anyone can give me little clue to get through this situation?

Answer 1

Your logic would be much easier to reason about if you used a smart pointer type for managing your memory. Cocos2d-x provides its own smart pointer type, cocos2d::RefPtr<T>, which is essentially a reference-counted pointer (think std::shared_ptr<T> or Objective-C ARC).

That said, given the information in the question, there is no reason the code you posted shouldn't work. CC_SAFE_DELETE(sch->ptr_view) (which is effectively delete ptr; ptr = nullptr;) shouldn't delete sch. There may be other memory bugs in your program. Again: smart pointers are your friend.