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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /usr/share/perl5/Memoize/

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Current File : //usr/share/perl5/Memoize/SDBM_File.pm

package Memoize::SDBM_File;

=head1 NAME

Memoize::SDBM_File - glue to provide EXISTS for SDBM_File for Storable use

=head1 DESCRIPTION

See L<Memoize>.

=cut

use SDBM_File;
@ISA = qw(SDBM_File);
$VERSION = '1.03';

$Verbose = 0;

sub AUTOLOAD {
  warn "Nonexistent function $AUTOLOAD invoked in Memoize::SDBM_File\n";
}

sub import {
  warn "Importing Memoize::SDBM_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::SDBM_File EXISTS (@_)\n" if $Verbose;
  my $self = shift;
  _backhash($self)  unless exists $keylist{$self};
  my $r = exists $keylist{$self}{$_[0]};
  warn "Memoize::SDBM_File EXISTS (@_) ==> $r\n" if $Verbose;
  $r;
}

sub DEFINED {
  warn "Memoize::SDBM_File DEFINED (@_)\n" if $Verbose;
  my $self = shift;
  _backhash($self)  unless exists $keylist{$self};
  defined $keylist{$self}{$_[0]};
}

sub DESTROY {
  warn "Memoize::SDBM_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::SDBM_File STORE (@_)\n" if $VERBOSE;
  my $self = shift;
  $keylist{$self}{$_[0]} = undef;
  $self->SUPER::STORE(@_);
}

# Inherit FETCH and TIEHASH

1;

haha - 2025