AlmostFriends.cpp

#ifndef almost_private
#define almost_private private
#endif
class A {
  private:
    void Private();
  almost_private:
    void AlmostPrivate();
}

class B {
  A m_a;
  void f();
}

#define almost_private public
#include "A.h"
void B::f() {
  m_a.AlmostPrivate();
}