comment on

Maybe I just don't understand WHY the ref($cargocult) idea is so bad. To me, it makes perfect sense... If someone calls the constructor on an instance rather than the class, it forces it to act as if it were called on the class. Isn't this "correct" in most cases?

I tried putting the line you tried and then calling my constructor on an already running instance, and it does return an object, but one blessed incorrectly(read: differently) for my purposes. When I try and invoke any methods on this object that is blessed into "Expense=HASH(0x123456)" and not "Expense" it gives me an error.

So, basically, my question is this... Can you please give me a real world scenario or two where I would want to call $object->new and not CLASS->new, and then an example of how you use that new returned object's methods, since it is not blessed into the correct class? Here's the code I used to come to these conclusions:

use Data::Dumper;

$exp1 = new Expense;
$exp1->place("place1");
$exp1->description("desc1");
$exp1->amount("1");
$exp1->details("details1");

$exp2 = new Expense;
$exp2->place("place2");
$exp2->description("desc2");
$exp2->amount("2");
$exp2->details("details2");

$exp3 = $exp1->new;
$exp3->place("place3");
$exp3->description("desc3");
$exp3->amount("3");
$exp3->details("details3");

print Data::Dumper->Dump( [ $exp1, $exp2, $exp3 ] , [ qw( exp1 exp2 ex
+p3 ) ] );

{

package Expense;

sub new {
    #my $either = shift;
    #my $class = ref($either) || $either;
    my $class = shift;
    my $self = {};
    $self->{_DESCRIPTION} = undef;
    $self->{_PLACE} = undef;
    $self->{_AMOUNT} = undef;
    $self->{_ID} = undef;
    $self->{_DETAILS} = undef;
    bless $self, $class;
}

sub place {
    my $self = shift;
    my $hiddenkey = "_PLACE";
    if (@_) { $self->{$hiddenkey} = shift; }
    return $self->{$hiddenkey};
}

sub description {
    my $self = shift;
    my $hiddenkey = "_DESCRIPTION";
    if (@_) { $self->{$hiddenkey} = shift; }
    return $self->{$hiddenkey};
}

sub amount {
    my $self = shift;
    my $hiddenkey = "_AMOUNT";
    if (@_) { $self->{$hiddenkey} = shift; }
    return $self->{$hiddenkey};
}

sub id {
    my $self = shift;
    my $hiddenkey = "_ID";
    if (@_) { $self->{$hiddenkey} = shift; }
    return $self->{$hiddenkey};
}

sub details {
    my $self = shift;
    my $hiddenkey = "_DETAILS";
    if (@_) { $self->{$hiddenkey} = shift; }
    return $self->{$hiddenkey};
}


} #end package
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In reply to Re: (jeffa) Re: My first stab at OO perl... by Theseus
in thread My first stab at OO perl... by Theseus

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