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Attribute::Params::Validate uses Attribute::Handlers. While I haven't testing this out, I suspect it breaks in any module that defines its own attribute handlers instead of using Attribute::Handlers. For example, Class::Std (see Class::Std : How does MODIFY_HASH_ATTRIBUTES work? -- in addition to lack of thread safety, yet another reason to be careful using it).

Params::Validate works just fine. I also find it useful to be able to define some default specs in one place and use it many times. With the attribute version, you always have to put the spec in the attribute line.

-xdg

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In reply to Re: Params::Validate or Attribute::Params::Validate? by xdg
in thread Params::Validate or Attribute::Params::Validate? by tphyahoo

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    [choroba]: can't you create a meta-key corresponding to the disjunction of the events?
    [robby_dobby]: Corion: Heh. This whole thing smells of Strategy Pattern or MVC pattern.
    [Corion]: And performance linear to the number of registered one-shots doesn't feel that bad. Maybe I should collect statistics on how many callbacks are outstanding ;)
    [Corion]: choroba: Yes, but the longer I thought about efficient hashes mapping the event type back to their callbacks, and how to keep them in sync, the more I thought that all that optimization might just not be worth it, even if it's horribly inelegant
    [Lady_Aleena]: My biggest problem with hashes at the moment is one with 2,501 keys.
    [choroba]: how many event types are there?
    [Corion]: Also I found that I can't conveniently weaken an array slot, which also is inconvenient, as I want my one-shots to disappear if the caller discards them
    [Corion]: choroba: Currently two or three that my program handles (WWW::Mechanize:: Chrome), but there might be more that become interesting
    [Corion]: But I don't expect more than 100 to be active at the same time, so I'm not really sure if there is a not-too-fancy data structure that is maintained with few lines of code where the performance is better than the linear scan ;)
    [Corion]: But I should do a mock-up program so that others can see what I'm talking about ;)

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