Inheritance of nested class

[bibhukalyana]

hi everyone,

I have 2 nested class (nest_1,nest_2).1st class is inherited by 2nd class and i want to access member of 1st nested class in a function of 2nd class.
I tried like...

.h file

class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    int main_data;
 
 
private:
    Ui::MainWindow *ui;
public:
    class nest_1
    {
    public:
        int data1;
    };
    class nest_2 : public nest_1
    {
    public:
        int data2;
        int test();
    };
};
 
class A : public MainWindow
{
public:
    int data;
 
    int test();
};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    int main_data;


private:
    Ui::MainWindow *ui;
public:
    class nest_1
    {
    public:
        int data1;
    };
    class nest_2 : public nest_1
    {
    public:
        int data2;
        int test();
    };
};

class A : public MainWindow
{
public:
    int data;

    int test();
};

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.cpp file

int MainWindow::nest_2::test()
{
               // here i want to access data1
}
 
 
int A::test()
{
   main_data = 0;              //here i am able to access main_data
}

int MainWindow::nest_2::test()
{
               // here i want to access data1
}


int A::test()
{
   main_data = 0;              //here i am able to access main_data
}

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I tried same thing for MainWindow and A.It is working.But for nested class it is not.

Can any one tell me how to access it or any error in my code ?

with regards
bibhu.

[wysota]

Works for me...

class Outer {
public:
 
  void call() { b.method(); }
private:
  class A {
  public:
    int x;
  };
 
  class B : public A {
  public:
  void method() { x = 7; }
  };
 
  B b;
};
 
 
int main() {
  Outer o;
  o.call();
  return 0;
}

class Outer {
public:

  void call() { b.method(); }
private:
  class A {
  public:
    int x;
  };

  class B : public A {
  public:
  void method() { x = 7; }
  };

  B b;
};


int main() {
  Outer o;
  o.call();
  return 0;
}

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[bibhukalyana]

thanks for reply........
i will try it.

if you want to use scope resolution operator(: then how you will use it.