Re^5: initialize all values in a hash

[DrHyde]

in reply to Re^4: initialize all values in a hash
in thread initialize all values in a hash

I mostly use Tie::Hash::Vivify to prevent autovivification thus:

  my $hashref = Tie::Hash::Vivify->new(
    sub { confess("No auto-vivifying!\n".Dumper(\@_)) }
  )

to avoid those annoyingly hard-to-track-down bugs where you've typoed a hash key.

[tobyink]

The autovivification module is pretty good for this kind of thing. Offers you the ability to simply switch off autovivification, warn about it, or croak. Rather than being tied to a particular hash, it's lexically scoped. And it's context-sensitive, so you could decide that 'store' operations are allowed to autovivify, like:

{
  no autovivification qw(strict);
  use autovivification qw(store);
  my %hash;
  $hash{foo}{bar}{baz} = 1;     # autovivifies OK
  delete $hash{fool}{bar}{baz}; # dies
}

If only autovivification weren't so tricky to type.