robert@2: package Filter;
robert@2: use base 'Exporter';
robert@2: our @EXPORT = ('filter');
robert@2: 
robert@2: 
robert@2: sub filter
robert@2: {
robert@2: 
robert@2: 	$ref = shift;
robert@2: 	@list = @_;
robert@2: 	my @ret = ();
robert@2: 	
robert@2: 	for $element(@list)
robert@2: 	{
robert@2: 		if ($ref->($element))
robert@2: 		{
robert@2: 			push @ret, $element;
robert@2: 		}
robert@2: 	}
robert@2: 
robert@2: 	return @ret
robert@2: 	
robert@2: }
robert@2: 
robert@2: 
robert@2: 1;