PV913TemplateInheritance

#include <iostream>
#include <array>

template <class T1>
class BaseA
{
protected:
    T1 fieldA;
public:
    BaseA(T1 val) : fieldA { val } { std::cout << "BaseA constructed for " << this << '\n'; };
    BaseA() : BaseA{ 65 } {};
    ~BaseA() { std::cout << "BaseA destructed for " << this << '\n'; }
    void print() { std::cout << "BaseA: " << fieldA << '\n'; };
};

//template <class T1>
//class BaseA<T1*>
//{
//protected:
//  T1* fieldA;
//public:
//  BaseA(T1* val) : fieldA{ new T1{*val} } { std::cout << "BaseA constructed for " << this << '\n'; };
//  //BaseA() : BaseA{ 65 } {};
//  ~BaseA() { delete fieldA;  std::cout << "BaseA destructed for " << this << '\n'; }
//  void print() { std::cout << "BaseA: " << *fieldA << '\n'; };
//};

template <class T1, class T2>
class Child : public BaseA<T1>
{
    T2 fieldC;
public:
    Child(T2 val, T1 inherVal) : BaseA<T1>{inherVal}, fieldC{ val } { std::cout << "Child constructed for " << this << '\n'; };
    Child() : Child { 66, 68 } {};
    ~Child() { std::cout << "Child destructed for " << this << '\n'; }
    void print() { std::cout << "Child: " << fieldC << " BaseA => fieldA = " << BaseA<T1>::fieldA << '\n'; };
};

template <class T1>
class ChildFull : public BaseA<T1>
{
    char fieldC;
public:
    ChildFull(char val, T1 inherVal) : BaseA<T1>{ inherVal }, fieldC{ val } { std::cout << "ChildFull constructed for " << this << '\n'; };
    ChildFull() : ChildFull{ 66, 68 } {};
    ~ChildFull() { std::cout << "ChildFull destructed for " << this << '\n'; }
    void print() { std::cout << "ChildFull: " << fieldC << " BaseA => fieldA = " << BaseA<T1>::fieldA << '\n'; };
};

int main()
{
    BaseA<int> b;
    b.print();

    Child<int, char> c;
    c.print();
}