Re: [Boost-Users] Newbie: Problem with Signals

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-05-19 07:43:28

Ray wrote:
> I am having some problems with boost::signals version 1_30_0 on XP,
> compiled and linked using VC6.
>
> I am building a timer mechanism, similar to that with Qt.
> A user instanciates a timer with some millisecond value, starts the
> timer via t.Start(), and then enters the event loop (or in most
> cases, returns from a function call by the event loop).
>
> Timer definition:
>
> class Timer  {
>   typedef boost::signal1<void, int> TimerSignalType;
>   typedef TimerSignalType::slot_type   TimerSlotType;
> public:
>   boost::signals::connection TimerConnect(const TimerSlotType& slot )
>   { return OnRing.connect( slot ); }
>   Timer();
>   Timer( const Timer& );
>   Timer( unsigned long millesecInterval, TimerType t = Continous );
>   ~Timer();
>
>   void Start();
>
>   void           Ring() {OnRing( myId );}
>
> private:
>
>   TimerSignalType OnRing;
>   int              myId;
> };
>
> void Rang( int i )
> {
>    cout << "Received timer " << endl;
> }
>
> main()
> {
>   EventLoop *eventLoop = EventLoop::Instance();
>   Timer t1( 3000, Continous );
>   t1.TimerConnect( boost::bind( Rang, _1) );
>   t1.Start();
>   eventLoop->Exec();
> }
>
> eventLoop->Exec() start an event loop.
> The code always crashes when atteping to execute the connected
> function.
>
> What am I doing wrong?

I see nothing wrong with the code you posted. When I added the necessary
stub definitions it compiled and ran fine.