Thread: compiler doesn't recognize my friend

Hi all,

Code:

#include "CallbackTimer.h" // declares callbackfun

namespace nsScheduler{

class Scheduler : boost::noncopyable
{
	friend class Job; 
	friend class WorkerThread;
	friend VOID CALLBACK callbackfun( PVOID param, BOOLEAN timer_or_wait_fired );
       //I want to allow that function access to member function onTimerTick()

       void onTimerTick();
       //.....
public:
       //...
};

}//namespace

Code:

//CallbackTimer.h

VOID CALLBACK callbackfun( PVOID param, BOOLEAN timer_or_wait_fired );

namespace nsScheduler{

class Scheduler;

class CallbackTimer :boost::noncopyable
{
//...
}



//CallbackTimer.cpp

#include "CallbackTimer.h"

#include "Scheduler.h"

namespace nsScheduler{

//...
}

VOID CALLBACK 
callbackfun( PVOID param, BOOLEAN timer_or_wait_fired )
{
	( (nsScheduler::Scheduler*)param)->onTimerTick();
}

but MSVC says:

.\CallbackTimer.cpp(48) : error C2248: 'nsScheduler::Scheduler::onTimerTick' : cannot access private member declared in class 'nsScheduler::Scheduler'

Does anybody has an idea why my friend decleration is ignored?

Thank you in advance!