Go4Expert - Static objects

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- - Static objects (http://www.go4expert.com/showthread.php?t=446)

Code:

#include<iostream>

using namespace std;



class A {

        

        int a,b;

        A obj;

        

};

main()

{

        cout<< " making of the object \n";

        A allo;

        cout << "Object completed develpoped\n";

        cout << sizeof(A);

        cout << "now the size of object\n";

        cout << sizeof(allo);

}

When I compiled this code it gives the error I . e. incomplete type
is not allowed.............but when I put static

Such as

Code:

#include<iostream>

using namespace std;



class A {

        

        int a,b;

        static A obj;

        

};

main()

{

        cout<< " making of the object \n";

        A allo;

        cout << "Object completed develpoped\n";

        cout << sizeof(A);

        cout << "now the size of object\n";

        cout << sizeof(allo);

}

It compiles without error giving the output as 8 in cout <<
sizeof(A); and the same 8 also in cout << sizeof(allo);

Can somebody throw some light on the behavior of static object in
its own class.

Re: Static objects

When its non static you are creating a cycle where the object has an object within itself as a member which is practically impossible to have but when it becomes static its equivalent to global object and so compiler does not give any error.

Re: Static objects

I'll add one thing that,-
just declare the class as:-
class A {
int a,b;
A *obj;
};
Your problem will be solved. Otherwise, it becomes a recursive definition, which is not allowed. You can surely have a self-referencing pointer.