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Re: Moose and arrays of objects

by moritz (Cardinal)
on Dec 03, 2012 at 10:37 UTC ( #1006842=note: print w/replies, xml ) Need Help??

in reply to Moose and arrays of objects

has 'verlet' => ( is =>'rw', isa => 'ArrayRef[Molecule::Atom]', required => 1, weak_ref => 1, default => sub { [] }, );

I'm pretty sure the weak_ref => 1 is wrong, because you don't keep another reference to the array. So when method add_verlet exits, the array reference is garbage-collected, and on the next call replaced by the default value.

So, remove the weak_ref => 1.

Once your object is destroyed, the array will also be destroyed. Since you weaken() the objects inside the array, they will go away as soon as your external references to them go away.

so I see that the actual question is how I said to perl that I do not want to destroy the objects stored in the array?

You don't have to do anything special. Remove all the weaken and weak_ref stuff. (You only need that if your object graph contains circles). The objects only go away once all references to them are gone, so usually you don't have to take care about it at all.

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[shmem]: perl -e 'warn "test$/", ^@^ '
[Eily]: well, at least it's right about warn doing the same thing as die :)
[shmem]: same with undef as last element
[msh210]: oh, good point. It's the best kind of correct
[shmem]: msh210: but I'd not call it a lie outright. That's when you do know the truth.
[msh210]: I don't have sendmail (I'm on MS Windows), so does one of you think you can report the bug?
[shmem]: msh210: 'tis about time to tell the sad truth to perl5porters - via perlbug
[msh210]: probably whoever wrote that actually knows the truth
[shmem]: msh210: you can save the perlbug text in a file and send that via your mail agent of choice
[msh210]: hm, okay, I'll try, thanks

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