Reputation: 127
--EDIT --
So sorry that I confused people, I just quickly typed this code out instead of copy and pasting, so I actually do #ifndef A_H #define A_H in my code. Ive changed the below code to show that
-- End edit --
I have two classes which each contain a pointer to an instance of the other class, but this is creating problems for me . My code is similar to the following
// A.h
#ifndef A_H
#define A_H
class B; // compiler error here
class A
{
B* foo;
// other members and functions
};
#endif
// A.cpp
#include "A.h"
#include "B.h"
/*
declare functions and use methods in both A and B
*/
// B.h
#ifndef B_H
#define B_H
class A;
class B
{
A** bar;
// other stuff
};
#endif
//B.cpp
#include "A.h"
#include "B.h"
/*
declare functions and use methods in both A and B
*/
I was told that forward declaring the other class int he header file then including the other file in the cpp file would work, but on the marked line I get an error that just says "forward declaration of 'struct b'"
Can anyone tell me what I'm doing wrong?
Upvotes: 1
Views: 1144
Reputation: 24450
Include one header, let say b.h in a.h. Do not forward declare B in a.h. b.h can stay as it is.
Otherwise you get sth like
class B {};
....
class B;
It is always wise to do preprocessing only on such errors.
Upvotes: 3