Question

class c {
    private:
        int n[10];
    public:
        c();
        ~c();
        int operator()(int i) { return n[i];};
};

class cc {
    private:

    public:
        c *mass;
        cc();
        ~cc();
        c& operator*() const {return *mass;};
};
int somfunc() {
    c *c1 = new c();

    cc * cc1 = new cc();

    (*cc1->mass)(1);



    delete c1;
}

I’ve got a pointer into class cc to class c.

Is there any way to get rid of record like this:

(*cc1->mass)(1);

and write somethink like that:

cc1->mass(1);

is it impossible?

Answer 1

When I saw the tags “c++” and “operator overloading”, my mind alarm turns ON.

C++ operator overloading is complex, and some operators like “()” or “->” make it more difficult.

I suggest, before overloading operators, making either a global function or method with the same purpouse, test it works, and later replace it with the operator.

Global friend function example:

class c {
    private:
        int n[10];      

    public:
        c();
        ~c();

        // int operator()(int i) { return n[i]; } 

        // there is a friend global function, that when receives a "c" object,
        // as a parameter, or declares a "c" object, as a local variable,
        // this function, will have access to the "public" members of "c" objects,
        // the "thisref" will be removed, when turned into a method
        friend int c_subscript(c thisref, int i) ;
};

int c_subscript(c* thisref, int i)
{
  return c->n[i];
}

int main()
{
  c* objC() = new c();
  // do something with "objcC"

  int x = c_subscript(objC, 3);
  // do something with "x"

  return 0;
} // int main(...)

Local function ( “method” ) example:

class c {
    private:
        int n[10];      

    public:
        c();
        ~c();

        // int operator()(int i) { return n[i]; }

        int subscript(int i) ;
};

int c::subscript(int i)
{
  return this.n[i];
}

int main()
{
  c* objC() = new c();
  // do something with "objcC"

  int x = c->subscript(objC, 3);
  // do something with "x"

  return 0;
} // int main(...)

And, finally use the overloaded operator:

class c {
    private:
        int n[10];      

    public:
        c();
        ~c();   

        int subscript(int i) ;

        int operator()(int i) { return this.subscript(i); }
};

int c::subscript(int i)
{
  return this.n[i];
}

int main()
{
  c* objC() = new c();
  // do something with "objcC"

  int x = c->subscript(3);
  // do something with "x"

  int x = c(3);
  // do something with "x"

  return 0;
} // int main(...)

Note that in the final example, I keep the method with a unique identifier.

Cheers.