Calling private method in C++

by

See my blog post. I’m reposting the code here

template<typename Tag>
struct result {
  /* export it ... */
  typedef typename Tag::type type;
  static type ptr;
};

template<typename Tag>
typename result<Tag>::type result<Tag>::ptr;

template<typename Tag, typename Tag::type p>
struct rob : result<Tag> {
  /* fill it ... */
  struct filler {
    filler() { result<Tag>::ptr = p; }
  };
  static filler filler_obj;
};

template<typename Tag, typename Tag::type p>
typename rob<Tag, p>::filler rob<Tag, p>::filler_obj;

Some class with private members

struct A {
private:
  void f() {
    std::cout << "proof!" << std::endl;
  }
};

And how to access them

struct Af { typedef void(A::*type)(); };
template class rob<Af, &A::f>;

int main() {
  A a;
  (a.*result<Af>::ptr)();
}

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