toysolver-0.4.0: Assorted decision procedures for SAT, Max-SAT, PB, MIP, etc

Copyright(c) Masahiro Sakai 2012
LicenseBSD-style
Maintainermasahiro.sakai@gmail.com
Stabilityprovisional
Portabilityportable
Safe HaskellSafe
LanguageHaskell2010

ToySolver.Data.LBool

Description

Lifted boolean type.

Synopsis

Documentation

data LBool Source #

Lifted Bool type. It has three values lTrue, lFalse, lUndef.

Instances

Eq LBool Source # 

Methods

(==) :: LBool -> LBool -> Bool #

(/=) :: LBool -> LBool -> Bool #

Show LBool Source # 

Methods

showsPrec :: Int -> LBool -> ShowS #

show :: LBool -> String #

showList :: [LBool] -> ShowS #

lTrue :: LBool Source #

lifted true value

lFalse :: LBool Source #

lifted false value

lUndef :: LBool Source #

undefined truth value

lnot :: LBool -> LBool Source #

  lnot lTrue == lFalse
  lnot lFalse == lTrue
  lnot lUndef == lUndef

liftBool :: Bool -> LBool Source #

  liftBool True == lTrue
  liftBool False == lFalse

unliftBool :: LBool -> Maybe Bool Source #

  unliftBool lTrue == Just True
  unliftBool lFalse == Just False
  unliftBool lUndef == Nothing