>>>>> "TB" == Tim Bunce <[EMAIL PROTECTED]> writes:
TB> On Thu, Feb 15, 2001 at 02:26:10PM -0500, Uri Guttman wrote:
>> >>>>> "TB" == Tim Bunce <[EMAIL PROTECTED]> 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 --------- [EMAIL PROTECTED] ---------- 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.com
