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root |
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package Memoize::SDBM_File; |
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=head1 NAME |
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Memoize::SDBM_File - glue to provide EXISTS for SDBM_File for Storable use |
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=head1 DESCRIPTION |
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See L<Memoize>. |
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=cut |
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use SDBM_File; |
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@ISA = qw(SDBM_File); |
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$VERSION = 0.65; |
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$Verbose = 0; |
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sub AUTOLOAD { |
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warn "Nonexistent function $AUTOLOAD invoked in Memoize::SDBM_File\n"; |
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} |
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sub import { |
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warn "Importing Memoize::SDBM_File\n" if $Verbose; |
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} |
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my %keylist; |
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# This is so ridiculous... |
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sub _backhash { |
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my $self = shift; |
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my %fakehash; |
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my $k; |
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for ($k = $self->FIRSTKEY(); defined $k; $k = $self->NEXTKEY($k)) { |
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$fakehash{$k} = undef; |
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} |
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$keylist{$self} = \%fakehash; |
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} |
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sub EXISTS { |
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warn "Memoize::SDBM_File EXISTS (@_)\n" if $Verbose; |
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my $self = shift; |
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_backhash($self) unless exists $keylist{$self}; |
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my $r = exists $keylist{$self}{$_[0]}; |
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warn "Memoize::SDBM_File EXISTS (@_) ==> $r\n" if $Verbose; |
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$r; |
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} |
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sub DEFINED { |
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warn "Memoize::SDBM_File DEFINED (@_)\n" if $Verbose; |
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my $self = shift; |
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_backhash($self) unless exists $keylist{$self}; |
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defined $keylist{$self}{$_[0]}; |
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} |
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sub DESTROY { |
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warn "Memoize::SDBM_File DESTROY (@_)\n" if $Verbose; |
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my $self = shift; |
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delete $keylist{$self}; # So much for reference counting... |
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$self->SUPER::DESTROY(@_); |
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} |
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# Maybe establish the keylist at TIEHASH time instead? |
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sub STORE { |
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warn "Memoize::SDBM_File STORE (@_)\n" if $VERBOSE; |
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my $self = shift; |
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$keylist{$self}{$_[0]} = undef; |
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$self->SUPER::STORE(@_); |
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} |
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# Inherit FETCH and TIEHASH |
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1; |
