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#include <iostream>
using namespace std;
 
class IParent
{
public:
 
    virtual void foo(  ) = 0;
};
 
class  Root : public IParent {
private:
 virtual void foo( ) override { cout << "foo!"; }
};
 
class Test {
public:
 Test( IParent& p ) : m_parent(p) {
     m_parent.foo(); // Wieso kann ich hier eine private Methode von Root aufrufen?
  }
private:
  IParent& m_parent;
};
 
int main()
{
  //Ausgeführter Code:
  Root root;
  Test t( root );
  root.foo();
}

prog.cpp: In function ‘int main()’:
prog.cpp:30:12: error: ‘virtual void Root::foo()’ is private within this context
   root.foo();
            ^
prog.cpp:13:15: note: declared private here
  virtual void foo( ) override { cout << "foo!"; }
               ^~~

Standard output is empty