Your example is breaking encapsulation. That is, it is avoiding the accessor and reaching in to the internals. If we have the object:
package OOtest;
sub new {
my $invoker = shift;
my $class = ref($invoker) || $invoker;
my $self = {};
bless ($self, $class);
$self->{list} = [];
return $self;
}
sub get_array {
my $self = shift;
return $self->{list};
}
To access the array,
use the accessor
get_array and do not bypass it by delving in and directory accessing the private variable.
my $obj = OOtest->new();
# NOT foreach my $tmp ( @{ $obj->list() }
foreach my $tmp ( @{ $obj->get_array() } ) {
# process list
}
Now, internally, you want to change
OOtest to use a hash, but you do not want to break other code that expects it to use (and wants) an array. Behold the beauty of accessors, you merely change the
get_array subroutine.
package OOtest;
sub new {
my $invoker = shift;
my $class = ref($invoker) || $invoker;
my $self = {};
bless ($self, $class);
$self->{list} = ();
return $self;
}
sub get_array {
my $self = shift;
return values %{$self->{list}}; # anything asking for an array gets
+ it
}
enoch
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