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Postings from March 2012
Chris, Exactly, Any is "all things" and Item is "a thing". I don't recall the details right now, but there is some Set Theory that explains it more clearly (assuming you understand set theory). - Stevan On Mar 22, 2012, at 5:34 PM, Chris Prather wrote: > On Thu, Mar 22, 2012 at 5:16 PM, Ricardo Signes > <perl.moose@rjbs.manxome.org> wrote: >> * Ovid <publiustemp-catalyst@yahoo.com> [2012-03-22T17:08:31] >>> In trying to explain this, I got stuck on "Item" and "Value". I have the >>> following note about them: >> >> We discussed this briefly on Twitter. For the record, it was around >> >> https://twitter.com/ovidperl/status/182936878192934912 >> >>> A word about the types in Moose::Util::TypeConstraints. "Any" means "anything" >>> (duh). An "Item" is the same as "Any" and in your author's consultation with >>> Moose experts, there was confusion expressed as to why these were different >> >> My guess is that it's vestigal from some concept of validating non-scalars. >> But I don't know. "It never comes up." >> > > If I recall the conversation I had with Stevan about it years ago (and > several I've seen with @larry on the perl6 side) the logic here is > semantic rather than syntactic. 'Any' is a catchall ... in Perl6 it's > called Mu now from the Zen Koan idea of un-asking the question of > "What type is this?". With that frame then the idea of "Something" > rather than "Anything" is captured in the type of 'Item'. > > But yeah what Ric said. "It never comes up." > > -ChrisThread Previous