Question

Is the following code problamatic regarding inserting into a list an object that inherits from two classes?

class A
{
}

class B
{
}

class C : public A, public B
{

}

C *myObj = new C();
std::list<A*> myList;
myList.push_front(myObj);

Is creating a list of type A and inserting an object of type C which is part of type B problematic?
I know this code compiles but I am affrade of memory issues.
If its a problem, what other options do I have to solve this?

Answer 1

As long as the list stores the data by reference or pointer and the destructor is virtual you’re fine.

The basic problem is that you are not allowed to store a C into a variable of A, but you can store it into A& or A*. So A a = C() would be just as bad as storing a C into a list<A> or vector<A>. This would lead to slicing