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use constant CACHE_VERSION => 3;

sub new {
    my ($pkg, $file) = @_;
    $pkg = ref($pkg) || $pkg;
    my $self = bless({}, $pkg);
    if ( defined($file) ) {
	$self->load($file);
	if ( ($self->{_version} || 1) != CACHE_VERSION ) {
	    warn("Incompatible cache version " . $self->version .
		 " -- invalidated\n") if $verbose;
	    $self = bless({}, $pkg);
	}
    }
    $self->{_version} = CACHE_VERSION;
    $self;
}

sub load {
    my ($self, $file) = @_;
    our $info;
    $info = undef;
    eval {
	require $file;
    };
    if ( $@ ) {
	warn("Illegal cache -- invalidated\n") if $verbose;
	return;
    }
    @{$self}{keys(%$info)} = values(%$info);
}

sub store {
    my ($self, $file) = @_;
    $Data::Dumper::Indent = 1;
    $Data::Dumper::Sortkeys = 1;
    $Data::Dumper::Sortkeys = 1; # avoid warnings