defining class-object declaration in header gives error

[Ami]

Hi All,
I have a class and i want to share the instance of it, to many
different units. To do this, I have declared the class type object in
common header file, which is included in required units.

e.g. Class_AB *objabc;

When i try to compile program, it gives me 100's of error message. am I
doing wrong? How to share otherwise the object instance in different
program units.

I am using VC++6.0 as programming IDE.

Thanks in advance for suggestions.

[Heinz Ozwirk]

"Ami" <ve*********@yahoo.com> schrieb im Newsbeitrag
news:11**********************@o13g2000cwo.googlegr oups.com...

Hi All,
I have a class and i want to share the instance of it, to many
different units. To do this, I have declared the class type object in
common header file, which is included in required units.

e.g. Class_AB *objabc;

When i try to compile program, it gives me 100's of error message. am I
doing wrong? How to share otherwise the object instance in different
program units.

Don't define variables in header files. Define them in only one CPP file and
write an extern declaration in the header. Share only the declaration:

// Header.h
extern Class_AB* objabc;
// CPP file
#include "Header.h"
....
Class_AB* objabc;

HTH
Heinz

[Ami]

Thanks a lot Heinz for your help. It works now.
Regards

[Marc BAUDY]

Ami a écrit :

Hi All,
I have a class and i want to share the instance of it, to many
different units. To do this, I have declared the class type object in
common header file, which is included in required units.

e.g. Class_AB *objabc;

When i try to compile program, it gives me 100's of error message. am I
doing wrong? How to share otherwise the object instance in different
program units.

I am using VC++6.0 as programming IDE.

Thanks in advance for suggestions.

Define the class type object in source file and in the associated header
in extern like this:

in test.c:
static Class_AB* objabc[ = ...];

in test.h:
extern Class_AB* objabc;

This will work ...

Marco