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Postings from February 2001
>>>>> "TB" == Tim Bunce <Tim.Bunce@ig.co.uk> writes: TB> On Thu, Feb 15, 2001 at 02:26:10PM -0500, Uri Guttman wrote: >> >>>>> "TB" == Tim Bunce <Tim.Bunce@ig.co.uk> writes: >> TB> As a part of that the weak reference concept, bolted recently into TB> perl5, could be made more central in perl6. >> TB> Around 92.769% of the time circular references are known to be TB> circular by the code that creates them (like a 'handy' ref back to TB> a parent node). Having a weakref, or similar, operator in the TB> language would help greatly. >> >> i second this. i am doing just what tim mentions. i have a child and >> parent object referring back to each other for callback purposes. the >> parent needs to own the child and the child has to have a parent ref to >> make a method callback in the parent. there is no way out of creating >> circular refs in that situation. i have to do an explicit object >> shutdown so i don't leak ram. this isn't a big problem in stem since you >> have to explicitly unregister stuff as well (that can't be done with >> scope exit) but it would still be nice not to have to worry about the >> ref loops. TB> So why not use the WeakRef module (or whatever it's called)? as i said, i need an explicit shutdown for other reasons in most cases (a global registry being one of them). and i have heard that weakref is not perfect so i haven't explored it. as of the moment i have just developed a circular link breaking style for these objects and it works. uri -- Uri Guttman --------- uri@sysarch.com ---------- http://www.sysarch.com SYStems ARCHitecture, Software Engineering, Perl, Internet, UNIX Consulting The Perl Books Page ----------- http://www.sysarch.com/cgi-bin/perl_books The Best Search Engine on the Net ---------- http://www.northernlight.comThread Previous | Thread Next