상속된 개체로 가득 찬 벡터를 삭제하는 방법

class CShape { /* blah */ };
class CCircle: public CShape { /* blah */ };
class CTriangle: public CShape { /* blah */ };
class CRectangle: CShape { /* blah */ };

template <class T>
void stlwipe(T &t)
{
   T::iterator i = t.begin();
   for(; i != t.end(); ++i)   delete (*i);
   t.clear();
}

void main(void)
{
   std::vector<CShape *> shapes;
   shapes.push_back(new CCircle());
   shapes.push_back(new CTrialngle());
   shapes.push_back(new CRectangle());
   stlwipe(shapes);
}