class myClass {
    int y;  // Regular variable
    myClass() : x (1) {}
    void foo1 () {x.x++; y++;} // This can change x
    void foo2 () {x.x--; y--;} // This shouldn't be able to change x
                            // I want it to throw a compile error
    class subClass {
      friend void myClass::foo1() ; // This must come after the declaration of foo1
      int x ; // private
    public:
      subClass (int x) : x (x) { }
      int read_x() const { return x ; }
      } x ;
};

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