Just the comment to my own advice.
My example may be not correct :-)
ROOT can not read the class object with the "private" default ctor
I am not sure about "protected"
Likely one has to make it public.
Valeri
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]
> On Behalf Of Valeri Fine
> Sent: Thursday, May 22, 2003 9:26 AM
> To: 'David Chamont'; roottalk@pcroot.cern.ch
> Subject: RE: [ROOT] ROOT I/O and static attributes
>
> Hello
> Generally speaking ROOT provides an "object" I/O.
>
> The class static attributes do belong to NO object.
>
> This means there is no simple and generic way to define which static
> variable one wants to be saved.
> I did not see any simple and elegant generic solution.
>
> On other hand each user can solve this problem for his/her
circumstance
> by introducing a singleton class to initiate and access the static
> global variables properly from that class ctor.
> For example you have some global variable:
> (Hmm I am not sure ROOT can write ref's ? )
>
>
> MyGlobalVariable * MyOwnClass::gMyGlob;
>
>
>
> Define:
> -------
> class globalVariableWritter : public TObject {
> private:
> static globalVariableWritter *fgThisPointer;
> protected:
> MyOwnClass &ref2 fMyGlob;
> globalVariableWritter() : fMyGlob(*gMyGlob) { fgThisPointer =
> this; }
> public:
> static globalVariableWritter *initiate()
> {
> if (!fgThisPointer) new globalVariableWritter();
> return fgThisPointer;
> }
> }
>
> and write it out like this:
>
> globalVariableWritter:: initiate()->Write()
>
> If ROOT doesn't support ref's then the schema above would be slightly
> more complicate.
>
>
> If you have a trouble to design such class just send me your concrete
> case description then I may have provided a further assistance.
>
> Thank you, Valeri
>
>
>
>
>
>
> > -----Original Message-----
> > From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]
> > On Behalf Of David Chamont
> > Sent: Thursday, May 22, 2003 5:37 AM
> > To: roottalk@pcroot.cern.ch
> > Subject: [ROOT] ROOT I/O and static attributes
> >
> >
> > Hi Rooters,
> >
> > A general question : is there any mechanism in ROOT I/O so to
> > save and restore the static attributes of the classes ?
> >
> > I agree that the static attrbutes should be avoided, and I
> > can understand you wonder why to save those attributes.
> > Actually, the underlying goal is to be able to save and restore
> > the state of a system of objects.
> >
> > Dacvid.
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