Question

Here’s the declaration:

class a{
public:
    void print_fib(int x){
        printf("%d\n",b::getfib(x));
    };
};

class b{
public:
    void init();    //calculate the Fibonacci numbers, save them in `fib[]`
    int getfib(int x);
private:
    int fib[10];
};

class c{
private:
    a ca;
    b cb;
};

How can I access cb.getfib() from ca.print_fib()?

Answer 1

If you pass this to ca and cb, you can use it to access cb and ca respectively.

class a {
    public:
        a(c *parent) : _parent(parent) {}
        aa() { parent->cb.bb(); }

    private:
        c *_parent;
};

class c {
    public:
        c() : ca(this), cb(this) {}

    ...