[gecode-users] Disjunction in a Propagator::propagate

[Christian Schulte]

Hi David,

I guess with "Boolean" you mean BoolView. For Boolean variables another view
exists: NegBoolView which implements Boolean negation (without any cost). So
what you could do is the following:

NegBoolView na(A), nb(B);
Bool::BinOrTrue<NegBoolView,NegBoolView>::post(home,na,nb);


Cheers
Christian

--
Christian Schulte, www.ict.kth.se/~cschulte/


-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of David Rijsman
Sent: Tuesday, May 06, 2008 9:28 AM
To: users at gecode.org
Subject: [gecode-users] Disjunction in a Propagator::propagate

I am writing a propagator and I want to create a disjunction in the
propagate method. Specifically I have a boolean A and B and want to
post the following:

A = 0 \/ B = 0

I know we have the binary boolean disjunction propagator for true (A=1
\/ B=1), now I am lost how to post the propagator for binary boolean
disjunction false given A and B?

Can I do the following in the propagate method:

Bool::BinOrTrue<BoolView,BoolView>::post(home,!A,!B)

which requires the minimodel which I think is more than I should need.

David

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