If I understand correctly, tie or captures will be useful. Here's an example of the latter: 
sub new_accessor {
   my $start    =  $_[0];
   my $end      =  $_[1];
   my $data_ref = \$_[2];  # Avoid making a copy.

   return sub {
      return substr($$data_ref, $start, $end-$start);
   };
}

{
   my $data = ...;

   my $start1 = ...;  # Calculate start from map.
   my $end1   = ...;  # Calculate end   from map.

   my $rec1 = new_accessor($start1, $end1, $data);
   print($rec1->(), "\n");
}

[download]

tie would allow you to do the same, but you'd use
print($rec1, "\n");
instead of
print($rec1->(), "\n");

Untested.

In reply to Re: slurped scalar map by ikegami
in thread slurped scalar map by 0xbeef

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