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

[Jarosław Staniek]

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.

RFC

-- 
regards / pozdrawiam,
  Jaroslaw Staniek / OpenOffice Polska / Kexi Team
  http://www.openoffice.com.pl  |  http://www.kexi-project.org
  KDElibs/Windows: http://wiki.kde.org/tiki-index.php?page=KDElibs+for+win32
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