Re: Forward reference compiler error...

barcaroller wrote:
> "Pete Becker" <pete@[EMAIL PROTECTED]
> wrote in message
> news:2008050310124475249-pete@[EMAIL PROTECTED]
>>
>> At the point of "new A" the compiler has to generate code to create
>> an object of tpye A. Since it hasn't seen the definition of A, it
>> can't do that.
>
>
> Thank you for your response.  Actually, it's not the new() that is
> causing me problems.  Let me present the problem in another way.
>
>
>    class A;  // forward reference
>
>    class B
>    {
>        int print()
>        {
>
>        }
>
>        foo(A* a)
>        {
>            cout << a->print();  // compiler error here
>        }
>    }
>
>    class A
>    {
>        int print()
>        {
>
>        }
>
>        bar(B* b)
>        {
>            cout << b->print();
>        }
>    }
>
>    main()
>    {
>        a = new A;
>        b = new B;
>
>        b->foo(a);
>        a->bar(b);
>    }
>
>
> Basically, I have two objects that are dependent on each other.  I
> thought I would be okay as long as I use pointers to these objects. Is 
> there a way around this problem (other than re-designing)?

Ouput of program is
21

#include <iostream>

class A;  // forward reference

class B
{
public:
    int print()
    {
        return 1;
    }

    void foo(A* a);
};

class A
{
public:
    int print()
    {
        return 2;
    }

    void bar(B* b)
    {
        std::cout << b->print();
    }
};

void B::foo(A* a)
{
    std::cout << a->print();
}

main()
{
    A* a = new A;
    B* b = new B;

    b->foo(a);
    a->bar(b);

    delete a;
    delete b;
}




-- 
Jim Langston
tazmaster@[EMAIL PROTECTED]