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Re: How do YOU do OO in Perl?

by tsee (Curate)
on Oct 08, 2003 at 13:51 UTC ( #297592=note: print w/replies, xml ) Need Help??


in reply to How do YOU do OO in Perl?

Most of the time, I write straightforward Perl OO code using blessed hashrefs and cloning of objects when new() is called on prototypes. Add some AUTOLOAD from a fixed set of attributes (and run-time method generation for speedup).

I try to keep everything nice and subclassable, but when that just wouldn't work, I offer some extension mechanism via delegation like Math::Symbolic::Custom. Also, I tend to offer two interfaces. One kept as simple as possible for the general usage case and one involving things like closures for the ultimate control in pathological cases.

Steffen

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[Corion]: Hmm - no, that outputs 1 for me on 5.14 - perl -wle "my $x = qq(\x{200b}); warn $x; warn length $x"
[hippo]: Smart - I'll give that a go. Thanks.
[hippo]: Ah
[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.

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