template-inheritance.cpp

/*
This has a compile error:
test3.cpp:14:18: error: use of undeclared identifier 'a'
    std::cout << a;
                 ^
1 error generated.
*/
#include <iostream>

template<typename T>
class A {
public:
  A(): a(17) {}
  int a;
};

template<typename T>
class B : public A<T> {
public:
  void print() {
    std::cout << a;
  }
};

int main() {
  B<int> b;

  b.print();

  return 0;
}

/*
This works fine.
*/

#include <iostream>

template<typename T>
class A {
public:
  A(): a(17) {}
  int a;
};

template<typename T>
class B : public A<int> {
public:
  void print() {
    std::cout << a;
  }
};

int main() {
  B<int> b;

  b.print();

  return 0;
}