Proposal for addition: tristate class - 3-state logical type

[Olivier Goffart]

Le Vendredi 9 Septembre 2005 23:54, Jarosław Staniek a écrit :
> File atttached: tristate.h
>
> Proposal for using this at kdelibs level.
>
> Simple yet readable bool type replacement when you need to return a special
> "don't know" or "cancelled" state from your function and you detest
> exceptions like me. I've estarted to use tristate class in apps, including
> Kexi, in 2004 with relative success: I was able to avoid using error-prone
> int type whenever people just want to return 0, 1 or 2 (2=="don't know").
>
> Contains all necessary casts from bool, operators and special 'cancelled'
> value.

That remind me an old thread
http://lists.kde.org/?t=109689376400005&r=1&w=2

My objections are still the same:  it can be done with a simple int or an 
enum. (where, AFAIK, operators like ! and ~ works also)

Can you point me a place in the code where that class will be usefull ?

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