C-std:: remove in STD:: vector_ if polymorphic std :: unique_ ptr

I have a three - level hierarchy, derived from optional and paintable derivatives Then I have a vector unique_ PTR < drawable > I fill with derived objects

I'm sure the vector can only be filled with objects from two bases at the same time

The problem arises when I try to delete an element from a vector by using a pointer to selected

Obviously, if I choose the drawable pointer, everything is fine, but this is not my intention

I got a runtime error that caused the program to crash Why does this happen and how can I solve it?

Solution

The key issue is STD:: remove_ If how to delete an element:

So basically, you keep one by PTR = VEC [2] Get () gets the original pointer, but there is no guarantee that PTR will remain valid You can only guarantee that VEC [2] is valid (before filtering, the only pointer in VEC [2] is located between the new logical end and the physical end, with an unspecified value)

In your example, when STD:: remove_ When if reaches the third element, the predicate returns true and remove_ If call VEC [2] Destructor for get() Because you keep an original pointer, the pointer you use has been destroyed