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#include <iostream>
 
class Hoge {
private:
  void f() { std::cout << "hoge" << std::endl; }
public:
  Hoge() {}
};
 
int main() {
// ordinary
    Hoge *hoge = new Hoge();
    hoge->f();
// vir function-address
    void (Hoge::*private_f)() = &Hoge::f;
    (hoge->*private_f)();
    delete hoge;
}
/* end */
 

prog.cpp: In function ‘int main()’:
prog.cpp:5:8: error: ‘void Hoge::f()’ is private
   void f() { std::cout << "hoge" << std::endl; }
        ^
prog.cpp:13:13: error: within this context
     hoge->f();
             ^
prog.cpp:5:8: error: ‘void Hoge::f()’ is private
   void f() { std::cout << "hoge" << std::endl; }
        ^
prog.cpp:15:40: error: within this context
     void (Hoge::*private_f)() = &Hoge::f;
                                        ^

Standard output is empty