in reply to Re: Using list elements within lists contexts with the distributive properties of HTML shortcuts
in thread Using list elements within lists contexts with the distributive properties of HTML shortcuts

True. And (for the first time here:), I actually knew that.

However, as I understand it, when I defined my @list, I actually defined a typeglob named *list which contains one each of a scaler, an array, a list and a hash all named list (and accessable locally with the appropriate funny character prefix).

Moreover, when one iterates over @list using one of the foreach or for...in constructs, the scaler $list is automagically (sorry. I forgot the correct term) set to the next value from @list at each iteration. Hence, my attempt to use that.

The problem in this case (thanks to jeffa!), is that the iteration in being performed outside of my scope, so $list is never being set.

At least that is my understanding at this point. Maybe someone will correct me if I have this wrong.

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Re: Re: Re: Using list elements within lists contexts with the distributive properties of HTML shortcuts
by chromatic (Archbishop) on Jun 09, 2002 at 23:49 UTC
    You have that wrong. :) Witness: 
    my $list = 'some default item';
my @list = (1, 2, 3, 4);
foreach (@list) {
    print "$list\n";
}

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    If you change the print line to print "$_\n";, you'll see the aliasing in effect. (It doesn't matter whether you use for or foreach, as they're synonyms.)

    Of course, there's a deeper misunderstanding, namely that declaring a lexical does not create what most people in the know might consider a typeglob (at least, not in a symbol table. It's put in a pad.). Nor are the values pointed to by typeglob slots automatically populated by iterating over an aggregate of the same name.

    It is true that when you do cause a new typeglob to be created, it does automagically get a new scalar in the appropriate slot, but that's done as an optimization, and not for any aliasing.

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      Proof if ever it were needed that a little knowledge is a dangerous thing

      Just as I think I can run, I get sacked!

      Thanks for putting me straight and my apologies for contradicting those that know better than me.

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