I'm trying to make a program that changes and compares fields of different documents. There is one base class with virtual functions and some children classes. For convenience I want to put objects of children classes into custom container that represents a linear stack. Here is the header code:
template <class T>
class DocContainer{
public:
struct ListElement{ // the stack itself
T obj;
ListElement *next;
};
DocContainer();
~DocContainer();
void pop_top();
T &get_top() const;
T &operator[](int);
void push_top(const T &);
int size() const;
void clear();
private:
ListElement *first;
int num;
};
I tried to google how to actualize a container for objects of different types and found out that I'm supposed to contain pointers to parent class using the polymorphism. But when I try to use it like this:
Passport *pass = new Passport;
// some code
DocContainer<Document*> DC;
DC.push_top(dynamic_cast<Document*>(pass));
The compiler says:
undefined reference to `DocContainer::push_top(Document* const&)'
Along with the same warnings about constructor and destructor of container.
Class Passport is a child class of Document.
class Passport : public Document{
// some code
};
The push_top() function of container in .cpp file:
template <class T>
void DocContainer<T>::push_top(const T &A){
auto cur = new ListElement;
cur->obj = A;
cur->next = first;
first = cur;
num++;
delete cur;
}
There is something surely wrong, but I couldn't find any clear answer. What's the mistake? Thanks in advance
