[Solved] Templated polymorphism is not working [closed]

Question

The main issue is you need to inherit template class this way:

template<class T>
class rectangle : public polygon<T> // polygon is a template, you need to make
                                ^^^ // rectangle from a concrete polygon type

Accepted Answer

The main issue is you need to inherit template class this way:

template<class T>
class rectangle : public polygon<T> // polygon is a template, you need to make
                                ^^^ // rectangle from a concrete polygon type