[gecode-users] About posting Boolean expression

[Christian Schulte]

Write instead:

 

BoolVar tmp =post(*this, ~(a[j]==(i+1)),ICL_DEF);

 

What you did is posting the constraint that (a[j] == (i+1)) (and hence the
return type of post is void as the compiler tells you). What you apparently
wanted to do is to post a reified constraint which you get with ~ (and hence
the return type is BoolVar).

 

Cheers

Christian

 

--

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

 

From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of Yong
Sent: Monday, October 19, 2009 3:26 PM
To: users at gecode.org
Subject: [gecode-users] About posting Boolean expression

 

Hi group,
A question about posting Boolean expression here. Any hint will be
appreciated!

My compiler will give "cannot convert from 'void' to 'Gecode::BoolVar'"
error on below code:

BoolVar tmp =post(*this,(a[j]==(i+1)),ICL_DEF);

Yong

ps: I'm using Gecode3.2.0 + VC++ 2008 Express Edition

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