Re^4: private recursive subroutines

Thanks, this is pretty much the response I would have made. The only thing I'd add is that as far as I understand things Perl 5.10 wont pay the same global penalty, rather the penalty will be restricted to the package or method itself, although I'm not sure which. This a side effect of Brandon Black's MRO patch for adding C3 style method resolution support to Perl.

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$world=~s/war/peace/g

Comment on Re^4: private recursive subroutines

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Re^5: private recursive subroutines by ph713 (Pilgrim) on May 14, 2007 at 00:14 UTC
Yes, in perl-current with my mro.c stuff (and eventually 5.10), when you change the @ISA of a class or change a method in a class, it only invalidates the method cache of that specific class, as well as any classes which inherit from that class (as opposed to the behavior in 5.9.4 and earlier, where changing a method or @ISA anywhere invalidated all method caches globally). Also, while in 5.9.4 and earlier the recursive lookup via @ISA is performed every time an uncached method call was made, with the new mro stuff the recursive @ISA parent hierarchy of a class is linearized into a simple flat list of classes to search with no duplicates, and cached. That "linearized isa" cache is only blown on @ISA changes in the given class or its parents, not method changes. So even when you (locally) invalidate the method caches by redefining a subroutine, these @ISA linearizations stay in place, making that first lookup to refill the cache faster than it was before.	[reply]
Re^6: private recursive subroutines by demerphq (Chancellor) on May 14, 2007 at 08:36 UTC
Im just curious as to whether there will be any way from perl code to see the linearized array. I could see that being useful indeed. Maybe @^ISA could provide read access to this data. --- $world=~s/war/peace/g	[reply]
Re^7: private recursive subroutines by ph713 (Pilgrim) on May 14, 2007 at 10:22 UTC
Yes, via mro::get_linear_isa('Foo'). This and other related calls are docced in bleadperl's "perldoc mro". There's also MRO::Compat on CPAN, so you can start using those interfaces today and be forward/backward compat between 5.6/5.8/5.10.	[reply]