Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Re: Undoable Objects

by bikeNomad (Priest)
on Jun 17, 2001 at 23:10 UTC ( #89188=note: print w/ replies, xml ) Need Help??

in reply to Undoable Objects

It would also be a good idea to add a DESTROY method in that same scope so that the history gets cleaned up when objects go away:

{ my %history; sub _log { my $self = shift; my $attrib = shift; my $value = $self->{$attrib}; push @{ $history{$self} }, [ $attrib, $value ]; } sub undo { my $self = shift; return unless (scalar @{ $history{$self} }); my ($attrib, $value) = @{ pop @{ $history{$self} } }; $self->{$attrib} = $value; } sub DESTROY { my $self = shift; delete $history{$self}; } }

Comment on Re: Undoable Objects
Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://89188]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (9)
As of 2015-11-30 22:15 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (786 votes), past polls