Problem with linking in Borland Builder C++ 5

[Dariusz Plygawko]

Welcome,
When I'am trying to call static function(setAre aLoader) from other class, I
get following linker-error. How to solve it? I'm slowly getting crazy... And
I have the same problem with the rest of static members... Help me!

[Linker Error] Unresolved external 'Area::m_loader ' referenced from
C:\DAREK\NAVIGA TOR\AREA.OBJ

***Area.h:***

#ifndef area_H
#define area_H

#include <vcl.h>
#include "Map.h"
#include "AreaLoader .h"

class Area
{

private:
Map * m_maps;
int m_mapsNumber;
public:
Area();
~Area();
static void setAreaLoader(A reaLoader * p_loader);
static Area * createAreaWithL oader(AnsiStrin g p_areaId);
static AreaLoader * m_loader;
};
#endif

***area.cpp:***

#include "Area.h"

....

void Area::setAreaLo ader(AreaLoader * p_loader)
{
m_loader = p_loader;
}

....

Best Regards,
Dariusz

[Josephine Schafer]

Re: Problem with linking in Borland Builder C++ 5


"Dariusz Plygawko" <Dariusz.Plygaw ko@cern.ch> wrote in message
news:belu0o$13t $1@sunnews.cern .ch...[color=blue]
> Welcome,
> When I'am trying to call static function(setAre aLoader) from other class,[/color]
I[color=blue]
> get following linker-error. How to solve it? I'm slowly getting crazy...[/color]
And[color=blue]
> I have the same problem with the rest of static members... Help me!
>
> [Linker Error] Unresolved external 'Area::m_loader ' referenced from
> C:\DAREK\NAVIGA TOR\AREA.OBJ
>
> ***Area.h:***
>
> #ifndef area_H
> #define area_H
>
> #include <vcl.h>
> #include "Map.h"
> #include "AreaLoader .h"
>
> class Area
> {
>
> private:
> Map * m_maps;
> int m_mapsNumber;
> public:
> Area();
> ~Area();
> static void setAreaLoader(A reaLoader * p_loader);
> static Area * createAreaWithL oader(AnsiStrin g p_areaId);
> static AreaLoader * m_loader;
> };
> #endif
>
> ***area.cpp:***
>
> #include "Area.h"
>
> ...
>
> void Area::setAreaLo ader(AreaLoader * p_loader)
> {
> m_loader = p_loader;
> }
>[/color]
You have just declared Area::m_loader, not defined it.You need to
define it in an implementation file (area.cpp) like
Area::m_loader = .... // define m_loader
You try to access it in Area::setAreaLo ader without defining it, so you
know why you are getting the linker error.

--
With best wishes,
J.Schafer

[John Harrison]

Re: Problem with linking in Borland Builder C++ 5

> >[color=blue]
> You have just declared Area::m_loader, not defined it.You need to
> define it in an implementation file (area.cpp) like
> Area::m_loader = .... // define m_loader[/color]

Actually like this

AreaLoader* Area::m_loader = ...;

john

[Dariusz Plygawko]

Re: Problem with linking in Borland Builder C++ 5

Thank You! :)