package Tie::File::AnyData;

use strict;
use warnings;

use Tie::File;

sub TIEARRAY
  {
    my ($pack,$file,%opts) = @_;
    if (defined $opts{'code'}){
      my $code = $opts{'code'};
      delete $opts{'code'};

      *Tie::File::get_next_rec = $code;

      no warnings 'redefine';
      *Tie::File::_read_record = sub {
	my ($self) = @_;
	my $rec;

	$rec = Tie::File::get_next_rec ( $self->{'fh'} );
	return $rec;
      }
    }
    Tie::File::TIEARRAY("Tie::File",$file,%opts);
  }

1;

##</code><code>##

use Tie::File::AnyData;
my $coderef = sub{
  ## Code to retrieve one by one the records of a given format
};
tie my @data, 'Tie::File::AnyData', $file, code => $coderef;
## Use the tied array

##</code><code>##

my $format1 = sub {
  ## Subroutine that reads records with format 1
}
my $format2 = sub {
  ## Subroutine that reads records with format 2
}
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!!