[gecode-users] regarding the advisors in GeCode

[Yong LIN]

Hi All,

I have a few questions regarding the structure of advisor in the GeCode
system ask for your advices.

1. I see that a propagator maintains a list of advisors and each advisor
monitors one of the variables that the propagator subscribes. I am
wondering whether it is certain that every variable of a propagator will be
monitored by one and only one advisor respectively in current propagator
(from variable's perspective, it is possible to have multiple advisors,
since a variable could be subscribed by more than one propagator) ?  and
every propagator in a space should have a list of advisors for its
variables?

2. I see that the constraint propagation is conducted through executing
propagators scheduled in a queue. But, when I attempt to access the list of
advisors of a executing propagator (by p -> u.advisors, which should return
the pointer to the head of the advisor list of the propagator),  I get a
NULL pointer. I am wondering what's is the reason for not being able to
access the advisors of a propagator. Whether we need explicitly switch it
on?

Thanks very much for your advices in advance!
best regards,
Lin
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