1 #--------------------------#
2 package PLP::Tie::Delay;
3 #--------------------------#
9 Delays hash generation. Unties the hash on first access, and replaces it by the generated one.
10 Uses symbolic references, because circular ties make Perl go nuts :)
12 tie %Some::hash, 'PLP::Tie::Delay', 'Some::hash', sub { \%generated_hash };
14 This module is part of the PLP internals and probably not of any use to others.
20 untie %{ $self->[0] };
21 %{ $self->[0] } = %{ $self->[1]->() };
25 my ($class, $hash, $source) = @_;
26 return bless [ $hash, $source ], $class;
30 my ($self, $key) = @_;
32 return ${ $self->[0] }{$key};
36 my ($self, $key, $value) = @_;
38 return ${ $self->[0] }{$key} = $value;
42 my ($self, $key) = @_;
44 return delete ${ $self->[0] }{$key};
50 return %{ $self->[0] };
54 my ($self, $key) = @_;
56 return exists ${ $self->[0] }{$key};
67 # Let's hope this never happens. (It's shouldn't.)