[Boost-users] boost::bind and Motif

Subject: [Boost-users] boost::bind and Motif
From: Sven Bauhan (sven.bauhan_at_[hidden])
Date: 2012-05-02 08:57:06

Hi,

I just tried to use boost::bind to create a function pointer from an 
object method to define it as a Motif callback function:

class AnimationController {
public:
     void timerCB( XtPointer, XtIntervalId* );
     void startTimer() {
         this->mTimeout = XtAppAddTimeOut( this->mAppContext, 
ANIMATION_TIMESTEP,
                 boost::bind( &AnimationController::timerCB, this ), NULL );
     }
     ...
};

For the definition of the Motif function:
XtIntervalId XtAppAddTimeOut(
     XtAppContext     /* app_context */,
     unsigned long     /* interval */,
     XtTimerCallbackProc /* proc */,
     XtPointer         /* closure */
);

with

typedef void (*XtTimerCallbackProc)(
     XtPointer         /* closure */,
     XtIntervalId*    /* id */
);

But I get the following error:

../AnimationController.cpp: In member function 'void 
geo::AnimationController::startTimer()':
../AnimationController.cpp:193: error: cannot convert 
'boost::_bi::bind_t<void (&)(void*, XtIntervalId*), boost::_mfi::dm<void 
()(void*, XtIntervalId*), geo::AnimationController>, 
boost::_bi::list1<boost::_bi::value<geo::AnimationController*> > >' to 
'void (*)(void*, XtIntervalId*)' for argument '3' to 'XtIntervalId 
XtAppAddTimeOut(_XtAppStruct*, long unsigned int, void (*)(void*, 
XtIntervalId*), void*)'

Can someone explain, what I did wrong?

Thanks, Sven