in reply to Re^2: Class::InsideOut - yet another riff on inside out objects.
in thread Class::InsideOut - yet another riff on inside out objects.

I think I have something for you.

I've been raking my brain for ways of having the attribute routine somehow register something like a hook whose call is delayed so that by the time the hook is triggered, the hash is on the pad. I hadn't been able to come up with any approach so far.

The idea I just came up with is simple: tie. :-)

Tie the attribute hash temporarily. The first access to it will trigger a call whence PadWalker can hopefully locate it. The rest is details - create an accessor closure in the appropriate package and untie the hash.

Unfortunately I'm not of much help since 5.6.1 manages the pads differently and I can't write test code to confirm this. But you should be able to make something of it.

Makeshifts last the longest.

  • Comment on Re^3: Class::InsideOut - yet another riff on inside out objects.

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Re^4: Class::InsideOut - yet another riff on inside out objects.
by adrianh (Chancellor) on Dec 22, 2002 at 01:36 UTC

    Ah. Unfortunately, not that sneaky after all. Consider:

    {
    package Test;
    use base qw(Class::InsideOut);    
    sub new { bless [], shift };
    my %foo : Field;
};

    [download]

    %foo might now be tied but, since there is no way to access it, no magical attribute generation can happen :-(

    Only works if you need to access the hash elsewhere in the same class - which may not always happen.

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      Argh. Of course. I'm starting to feel a bit stupid. I should get 5.8 myself and start playing around so I don't miss the obvious loopholes in my ideas.

      At any rate it looks as though we'll have to get out the heavy hitter to crush this one..

      Makeshifts last the longest.

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        I've never used any of the B:: modules in anger before - maybe if I get some free time over the Crimble break I'll give it a whirl.

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Re^4: Class::InsideOut - yet another riff on inside out objects.
by adrianh (Chancellor) on Dec 20, 2002 at 14:23 UTC
    The idea I eventually came up with is simple: tie.

    Sneaky. Like it. Can't see a reason why it wouldn't work off the top of my head. Might give it a whirl this weekend when I have some more time :-)

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