Re: Looping dependencies
Posted by
Ferdinando M. Ametrano-3 on
Feb 07, 2012; 3:03pm
URL: http://quantlib.414.s1.nabble.com/Looping-dependencies-tp13460p13461.html
Hi LucaOn Sun, Feb 5, 2012 at 9:26 PM, Luca Billi <
[hidden email]> wrote:
> I noticed that the current implementation of LazyObjects generates
> infinite recursions
> in the case the dependency hierarchy among Observer/Observable objects
> contains loops.
>
> A suggestion to break the infinite recursion is to replace the update()
> method as follows:
good catch, even if on the 1.2.0 release branch it was already fixed as in the following
inline void LazyObject::update() {
// forwards notifications only the first time
if (calculated_) {
// set to false early, otherways non-lazy observers would be
// served obsolete data because of calculated_ being still true
calculated_ = false;
// observers don't expect notifications from frozen objects
if (!frozen_)
notifyObservers();
}
}
I've added your "prevent infinite recursion" comment too
ciao -- Nando
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