Question

In C++, is there some way to create a class that have, as attribute, an object of a class that have, as attribute, an object of the first class?

e.g.:

class A {
    B attribute;
public:
    A(){}
};

class B {
    A attribute;
public:
    B(){}
};

The code above does not compile. Is there some way to do something alike?

Thanks!

Answer 1

First, you need to forward declare your class B. If not, the compiler wouldn’t know what the B is. Also, change the attributes to be pointers, or else you will still have a compiler error, even though you forward declared B, it still doesn’t know the implementation yet!

The following code may help, good luck…

class B;

class A {
    B *attribute;
public:
    A(){}
};

class B {
    A *attribute;
public:
    B(){}
};