Spaces:
Running
Running
File size: 1,488 Bytes
1d777c4 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 |
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;
|