Hide class implementation from driver?

Is there a way to hide a class implementation from a driver?

I want to be able to have a driver file that can instantiate an object from CLASS A, but not be able to instantiate anything or access anything from CLASS B.

However, I want CLASS A to have private data access to CLASS B?

Does nesting classes accomplish this? :confused:

I'm thinking.. make class B a container class.. with pure virtual functions.. this will prevent class B from instantiating any objects...


I don't think a derived class can access 'private' variables from the parent class..

so I'm thinkin' Class B will have 'protected' level variables..


Then you can derive class A : protected class B

I'm not exactly sure what you mean... but if you make CLASS B a private nested class in CLASS A, then no other code outside of CLASS A and its friends would be able to instantiate or access CLASS B.

>I want to be able to have a driver file that can instantiate an object from CLASS A, but not be able to instantiate anything or access anything from CLASS B.
Nest class B within class A's private section and make class A a friend of class B to access B's private members from A:

Code:

---

#include <iostream>

class A {
  class B {
    friend class A;
    int i;
  } b;
public:
  A() { b.i = 10; }
  void print() { std::cout<< b.i <<std::endl; }
};

int main()
{
  A a;

  a.print();
}

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Is making A a friend of B really necessary? Unless there are friends of A that you don't want to see B, you could just use normal encapsulation to give A whatever access to B is appropriate.

>Is making A a friend of B really necessary?
No, but accessing B's private members was a part of the question.

Quote:

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However, I want CLASS A to have private data access to CLASS B

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