I've looked for the answer but still can't figure this out.
Sorry, but my work is too complex to copy here sample code.
I have a function, which gets a pointer as parameter; I use it, but later, I need a kind of callback, where I want to use my old pointed object.
The problem is, when this callback is invoked, the pointer has already been deleted or freed. My idea was to make a copy of the pointed object on the heap, and free it when callback is finished. But I got lost between pointers, copy constructors and other stuff. The solution is probably quite simple, but I'm stuck.
Suppose you have a type T, and a pointer T* ptr; Assuming ptr is currently a valid pointer, then T* ptr2 = new T(*ptr); should invoke the copy constructor on T to create a new pointer on the heap. Now, this requires that your type T has a correctly written copy constructor and destructor and the like.