[vdr] Re: VDR Plugin System - First Step

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Stefan Huelswitt wrote:
> 
> On 10 May 2002 Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de> wrote:
> 
> >> @@ -147,8 +149,8 @@
> >>    T *Get(int Index) const { return (T *)cListBase::Get(Index); }
> >>    T *First(void) const { return (T *)objects; }
> >>    T *Last(void) const { return (T *)lastObject; }
> >> -  T *Prev(const T *object) const { return (T *)object->Prev(); }
> >> -  T *Next(const T *object) const { return (T *)object->Next(); }
> >> +  T *Prev(const T *object) const { return (T *)object->cListObject::Prev(); }
> >> +  T *Next(const T *object) const { return (T *)object->cListObject::Next(); }
> >>    };
> >>
> >> else compiling fails for classes which are ListObject and
> >> ListBase at one. e.g.:
> >>
> >> class cPlayList : public cConfig<cMP3>, public cListObject {
> >>   };
> >
> > Is that really a good idea to derive cPlayList from cConfig *and* cListObject?
> > Shouldn't cPlayList rather have a *member* of type cConfig?
> 
> Oh, I think the structure is not visible from this small piece of
> code. Actually I have
> 
> class cPlayLists : public cList<cPlayList>
> class cPlayList : public cConfig<cMP3>, public cListObject
> class cMP3 : public cListObject
> 
> so cPlaylist is a cListObject in cPlayLists AND a cListBase for
> cList<cMP3> (covered in cConfig<cMP3> to use the parsing
> functions).
> 
> In this case cPlayList::Next() is ambiguous (cListObject::Next()
> or cListBase::Next()) The same for Prev().
> 
> Hope that this isn't to weird :-)

Ok, I see know what you're doing.
The classes you define result in a "list of lists", and there it is
necessary to make sure the right Prev() and Next() gets called.

I'll include your modification in version 1.1.1.

Klaus
-- 
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Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
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