If you want static checks, don't use fields. Use something like Tie::Hash::FixedKeys. 
use Tie::Hash::FixedKeys;

my @keys = qw( a b c );

sub new {
    my $class = shift;
    my %args = @_;

    my $self = {};
    tie %$self, 'Tie::Hash::FixedKeys', @keys;

    foreach my $k ( @keys ) {
        if ( exists $args{$k} ) {
            $self->{$k} = $args->{$k};
        }
    }

    return bless $self, $class;
}

[download]
Now, you have all the benefits of static fieldname checking without going into the depths of a deprecated feature. Maybe it's just me, but I'd strongly prefer that.

Of course, the better solution is to create your own OO framework that auto-generates mutators based on some static list of mutator names. Writing one is the matter of a couple hours. You can even crib heavily from CPAN and call it your own work. That way, everything is a method call. Direct attribute access is horrible practice.

My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re^3: Fields pragma - the poor man's OO framework? by dragonchild
in thread Fields pragma - the poor man's OO framework? by waba

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