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package Tie::File::AnyData;

...
  }

1;

use Tie::File::AnyData;
my $coderef = sub{
...
};
tie my @data, 'Tie::File::AnyData', $file, code => $coderef;
## Use the tied array

my $format1 = sub {
  ## Subroutine that reads records with format 1
...
}
tie my @dataf1, 'Tie::File::AnyData', $file_format1, code => $format1;
+ ## Creates get_next_rec and redefines _read_record
tie my @dataf2, 'Tie::File::AnyData', $file_format2, code => $format2;
+ ## Re-defines get_next_rec!!