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#include <iostream>
 
class base {
  friend class deleter;
protected:
  static void operator delete(void *p);
};
 
class derived : public base {
};
 
class deleter {
public:
  void del(base *p) {
  	delete p;
  }
};
 
auto main()->int {
  derived *derivedp = new derived();
 
  //delete derivedp;			// this must not be allowed
 
  deleter thisdeleter;
  thisdeleter.del(derivedp);	// this should succeed
 
  return EXIT_SUCCESS;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:15: error: ‘static void base::operator delete(void*)’ is protected
   static void operator delete(void *p);
               ^
prog.cpp:20:35: error: within this context
   derived *derivedp = new derived();
                                   ^
prog.cpp:6:15: error: ‘static void base::operator delete(void*)’ is protected
   static void operator delete(void *p);
               ^
prog.cpp:20:35: error: within this context
   derived *derivedp = new derived();
                                   ^

Standard output is empty