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

[Aristotle]

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.

[adrianh]

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

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

%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.

[Aristotle]

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.

[adrianh]

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.

[adrianh]

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 :-)