compilation problem... WHY?

[Dariusz Plygawko]

Welcome,
I will simplyfy my problem...

There are 3 classes in 3 files(actually 6, *.h and *.cpp). Every class uses
2 others.
These are *.h:
--------------------
....
include <B.h>
include <C.h>
....
class A
{
B b;
C c;
....
}
--------------------
....
include <A.h>
include <C.h>
class B
{
A a;
C c;
....
}
--------------------
....
include <A.h>
include <B.h>
class C
{
A a;
B b;
....
}

Why it dosn't compile? Unless I put before each class declaration of others:
class B;
class C;
etc...

Is it only solution?

Thanks,
Dariusz

 

[red floyd]

Welcome,
I will simplyfy my problem...

There are 3 classes in 3 files(actually 6, *.h and *.cpp). Every class uses
2 others.
These are *.h:
--------------------
...
include <B.h>
include <C.h>
...
class A
{
B b;
C c;
...
}
--------------------
...
include <A.h>
include <C.h>
class B
{
A a;
C c;
...
}
--------------------
...
include <A.h>
include <B.h>
class C
{
A a;
B b;
...
}

Why it dosn't compile? Unless I put before each class declaration of others:
class B;
class C;
etc...

Is it only solution?

Thanks,
Dariusz

I'm sure there's a FAQ on circular dependencies.

In addition, your includes should use "A.h", "B.h", and "C.h", instead of <A.h>, etc...
Angle bracketed includes are for standard include files.

 

[Artie Gold]

I'm sure there's a FAQ on circular dependencies.

In addition, your includes should use "A.h", "B.h", and "C.h", instead
of <A.h>, etc...
Angle bracketed includes are for standard include files.

Everything the OR has mentioned is correct -- but there's a deeper
problem here. In the example the OP provided, how big is an instance
of class A?

Think about it. ;-)

HTH,
--ag

 

[peter.ludikovsky]

Why it dosn't compile? Unless I put before each class declaration of others:
class B;
class C;
etc...

I can't tell exactly what your problem is, but according to your example it
seems that your classes are recursiv. The compiler can't figure out when to
stop solving depencies and simply stops.

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