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Postings from March 2000
Tom Christiansen <tchrist@chthon.perl.com> wrote
> #!/usr/bin/perl -wl
> @cast = (
> { name => "pebbles", age => 2, role => "kid" },
> { name => "wilma", age => 31, role => "wife" },
> { name => "fred", age => 36, role => "husband" },
> );
> print @cast->{age}->{name};
>
> The result here, you see, is "fred", rather than the far more
> readily expected "HAVE YOU LIKE COMPLETELY LOST YOUR MIND?".
Well, I expected "fred". But then, I'm AVHV aware.
I have lots of data structures like that (arrays of hashes), and I
regularly find that some minor bug of mine causes Perl to dive into
the AVHV code with sometimes surprising consequences (including SEGVs).
> For a good time, try to guess without running it, what prints
> out if you interchange the subscripts:
>
> print @cast->{name}->{age};
Without running it, I couldn't guess exactly which error it would stop
on, but otherwise ...
> Yes, these are all bugs, not features. But hard to fix.
Nope. Once you've accepted @x->[2] as a shorthand for (\@x)->[2],
these are all features. But AVHV is of course still experimental.
And it would be easy to fix - just remove AVHV. :-)
Mike Guy