Closures are totally workable as a basis for OO Perl...

#!/usr/bin/env perl

use strict;
use warnings;
use Data::Dumper;

{
    package Person;
    sub new
    {
        my $class = shift;
        my %store;
        bless sub
        {
            my ($action, $slot, $value) = @_;
            for ($action)
            {
                if (/fetch/)  { return $store{$slot} }
                if (/store/)  { return $store{$slot} = $value }
                if (/delete/) { return delete $store{$slot} }
                if (/exists/) { return exists $store{$slot} }
            }
            die;
        } => $class;
    }
    
    sub name
    {
        my $self = shift;
        @_ ? $self->(store => "name", @_) : $self->(fetch => "name")
    }
    
    sub age
    {
        my $self = shift;
        @_ ? $self->(store => "age", @_): $self->(fetch => "age")
    }
}

my $person = Person->new;
$person->name("Bob");
$person->age("42");

print $person->name, " is ", $person->age, " years old.\n";
print Dumper($person);

[download]

However, they're slower than the more usual blessed hashref storage, because a method call will typically involve at least two sub calls.

For some reason I feel compelled to produce a MooseX module allowing you to use blessed coderefs for Moose objects like the example above.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re^4: OO Perl Baby Steps by tobyink
in thread OO Perl Baby Steps by Clovis_Sangrail

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