Re: call subroutine if scalar is changed

[ikegami]

tie is overkill. Use Variable::Magic.

use Variable::Magic qw( wizard cast );
 
my $wiz = wizard(
   set => sub { print "Now set to ${$_[0]}.\n" },
);

cast my $name, $wiz;

[stevieb]

Now that is interesting.

Thanks for a new rabbit hole that I didn't have time for :)

[LanX]

I suppose this could be used to couple two variables @a=@$a or vice versa $a=@$a such that the coupling survives new assignments and the partner is destroyed as soon as the original is? 🤩

[ikegami]

Yes, though I think it would be easier with tie.