Re^3: Secret Perl Operators: the boolean list squash operator, x!!

[Aristotle]

He probably means something like this:

exists $hash{ foo } && exists $hash{ foo }{ bar } ? $hash{ foo }{ bar 
+} : ()

In this case, switching to x!! will cause $hash{ foo }{ bar } to always be evaluated, which will cause $hash{ foo } to be autovivified even if the condition is false.

[Jenda]

I see. Actually to prevent confusion ... even this would autovivify:

@a  = ( $hash{foo}{bar} x!! 0);

I guess we'd need to "fix" the x operator to not evaluate the lefthand operator if the righthand one is <=0.

[eric256]

Update: Never mind, i see it now ;P)

Why would that be trouble?

use strict;
use warnings;

use Data::Dumper;

my $hash = { test => 1};
print Dumper($hash);
print "Hello\n" x!! exists($hash->{test});
print Dumper($hash);
print "One More\n" x!! exists($hash->{test2}) && exists($hash->{test2}
+->{Dude});
print Dumper($hash);

That works as expected and doesn't autovivify anything...did I miss something?