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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

In reply to Re: Why get() and set() accessor methods are evil by enoch
in thread Why get() and set() accessor methods are evil by synistar

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