Leandro, On xbase++ you can create them this way
http://databear.wordpress.com/2009/08/28/xbase-singleton-pattern/ Maybe you can adopt this to harbour. Maurilio. Leandro Damasio wrote: > Hi, > > My name is Leandro Damasio and I have started to follow Harbour Project > Main Developer List few days ago. I recently started 2D Informatica with > my associate Ted, to develop commercial aplications using [x]Harbour. We > used xHarbour + BCC55 + HWGUI for about 3 years, until we read > xhb-diff.txt document and decided to try Harbour instead. > > We are about to realease 2DWGUI, an Object Oriented Harbour API to Win32 > GUI, and its going to be a free product but not opensource from start. > > Our experience with opensource development is minimal, but I believe we > could be useful by giving sugestions and/or reporting problems at least. > > My first try: > > Does harbour have native support to singleton classes? Its an useful > design pattern to declare unique instance objects, so the same instance > is reacheable/accessible globally by just calling for the the class name. > We implemented Singleton objects in xHarbour, but I'm sure the native > implementation should be done better by someone who knows the object > machine inside. > > The Singleton Class usage is like below: > > <code> > > CLASS Aplication SINGLETON > > DATA Status > > METHOD Init(aParams) > METHOD Run() > METHOD End() > > ENDCLASS > > > Procedure Main (...) > > Aplication():Init(hb_aParams()) > > Func2() > > Aplication():End() > > Return > > > Static Function Func2() > > Aplication():Run() > > Return Aplication():Status > > </code> > > If it is not implemented yet, do you think its a good idea to implement > natively? > > Thanks > Leandro Damasio > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Harbour mailing list (attachment size limit: 40KB) > Harbour@harbour-project.org > http://lists.harbour-project.org/mailman/listinfo/harbour -- __________ | | | |__| Maurilio Longo |_|_|_|____| farmaconsult s.r.l. _______________________________________________ Harbour mailing list (attachment size limit: 40KB) Harbour@harbour-project.org http://lists.harbour-project.org/mailman/listinfo/harbour
