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package Memoize::NDBM_File; =head1 NAME Memoize::NDBM_File - glue to provide EXISTS for NDBM_File for Storable use =head1 DESCRIPTION See L<Memoize>. =cut use NDBM_File; @ISA = qw(NDBM_File); $VERSION = '1.03'; $Verbose = 0; sub AUTOLOAD { warn "Nonexistent function $AUTOLOAD invoked in Memoize::NDBM_File\n"; } sub import { warn "Importing Memoize::NDBM_File\n" if $Verbose; } my %keylist; # This is so ridiculous... sub _backhash { my $self = shift; my %fakehash; my $k; for ($k = $self->FIRSTKEY(); defined $k; $k = $self->NEXTKEY($k)) { $fakehash{$k} = undef; } $keylist{$self} = \%fakehash; } sub EXISTS { warn "Memoize::NDBM_File EXISTS (@_)\n" if $Verbose; my $self = shift; _backhash($self) unless exists $keylist{$self}; my $r = exists $keylist{$self}{$_[0]}; warn "Memoize::NDBM_File EXISTS (@_) ==> $r\n" if $Verbose; $r; } sub DEFINED { warn "Memoize::NDBM_File DEFINED (@_)\n" if $Verbose; my $self = shift; _backhash($self) unless exists $keylist{$self}; defined $keylist{$self}{$_[0]}; } sub DESTROY { warn "Memoize::NDBM_File DESTROY (@_)\n" if $Verbose; my $self = shift; delete $keylist{$self}; # So much for reference counting... $self->SUPER::DESTROY(@_); } # Maybe establish the keylist at TIEHASH time instead? sub STORE { warn "Memoize::NDBM_File STORE (@_)\n" if $VERBOSE; my $self = shift; $keylist{$self}{$_[0]} = undef; $self->SUPER::STORE(@_); } # Inherit FETCH and TIEHASH 1;