[Qt-interest] How to deal with pointers for a QDataStream?

[Thiago Macieira]

Em Segunda-feira 19 Abril 2010, às 14:41:45, Oliver Heins escreveu:
> I have a data structure which holds some pointers:
> 
> class Token
> {
> public:
>     enum Type { Space, Paragraph, Kern, Char, Format, Note, End };
>     enum SubType { Bold, Italic,
>                    Header1, Header2, Header3, Header4, Header5, Header6,
>                    Itemize, Enumerate, Description, Item,
>                    Note1, Note2, Note3, Note4, Note5 };
> 
>     [...]
> 
>     Type type;
>     SubType subType;
>     QChar chr;
>     Token *parent;
>     QLinkedList<Token *> children;
>     Token *partner;
> };
> 
> As saving pointers directly to a QDataStream will obviously not work,
> what would be a good strategy to save the structure?

Save pointed-to children, then restore it later by creating objects.

I don't think it makes sense to save the parent. Instead, the parent should 
set itself in its children when loading them.

As for the partners, it's your structure. Probably the parent should save the 
partnership relations after the children stream and then set them after 
loading them.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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