To STL or not to STL, that is the question...

[AvDav]

Well, I don't know what standard says about such situation when you have the first part of hierarchy with non-virtual dtor and the other part with virtual dtor, and trying to delete via some class pointer which has virtual dtor. The point is that it is dangerious to derive a class from some class which has non-virtual dtor.
Imagine a situation where others can use that class:

typedef vector<POINT> Shape;
vector<Shape*> all_shapes;

struct Shape1 : Shape
{
 virtual ~Shape1() {}
};
struct Shape2 : Shape
{
 virtual ~Shape2() {} 
};

void erase_all_shapes()
{
 //assume several instances are created  by new and are inserted into all_shapes.

 for(Shape::iterator it = all_shapes.begin()....)
   delete *it; //fault at least in MSVC.
}

Of course it's a very common case though.