I'd be interested to know more about your project and why you're considering going down that route. (See: When to use prototype inheritence?). I'm also interested in your experiences after the project.

There's also Class::SelfMethods by the same guy who wrote Class::Prototyped (Toby Everret). It's worth checking out as it had input from Damian Conway and Sean Burke. (Gleaned from the docs).

Unfortunately, I haven't got much practical experience with the modules so can't give you much advice. I'm considering emailing these authors to find out how the modules are being used and what the experience have been. I'll report back if I do.

I have my own, minimal version which is still being designed and debugged and may be ditched for a module implementation
The important bits follow, just 'new' and an AUTOLOAD accessor. 

sub AUTOLOAD { # attrs
    my ($self) = @_;
    (my $attr = $AUTOLOAD) =~ s/^.*:://;
    return if $attr eq 'DESTROY';

    return $self->{$attr} if(exists $self->{$attr});
    return $self->{prototype}->$attr if(exists $self->{prototype});
}

=item new
   
Create a new Slot with prototyping.  
   
    # class method
    my $proto = SD::Slot->new({ min_val => 1, max_val => 10 });
    
    # $slot is blessed as an SD::Slot and has prototype = $proto
    my $slot = $proto->new({ min_val => 0 });
   
    # $slot2 isa SD::Slot::Multi but still has prototype = $proto
    my $slot2 = SD::Slot::Multi->new({ prototype => $proto });
   
The parameter hashref is blessed into the appropriate class and
returned.  
   
=cut
sub new {
    my ($class, $proto, $self); # @_ processed conditionally

    if($class = ref $_[0]) {
        $proto = shift; # we have a prototype object
    } else {
        $class = shift;
    }

    $self = shift || {};

    if(!exists $self->{prototype} && $proto) {
        $self->{prototype} = $proto;
    }

    bless $self => $class;
}

# example use (config)
my %prototypes;
$prototypes{int} = SD::Slot->new({
    widget => 'textfield',
    constraints => [
        \&SD::Constraints::integer_rx,
        \&SD::Constraints::min_val,
        \&SD::Constraints::max_val,
    ],
}); 
    
$prototypes{int1_10} = $prototypes{int}->new({
    prototype => $prototypes{int},
    skip_warn => 1,
    min_val   => 1,
    max_val   => 10,
});

my %slots;
$slots{intelligence} = $prototypes{int1_10}->new({
    name => 'intelligence',
    mandatory => 1,
    constraints => [
        # add extra constraint
        @{ $prototypes{int}->constraints },
        sub { $_[1] % 2 or die E->new(
                "Not an odd number '$_[1]'") },
    ],
});

[download]

Brad

In reply to Re: Class::Classless vs. Class::Prototyped by bsb
in thread Class::Classless vs. Class::Prototyped by John M. Dlugosz

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