package MyTie;

use Carp;                # So we can croak our error
use Data::Dumper;
use strict;
use warnings;

sub TIEHANDLE { #Carp::cluck "\nTIEHANDLE: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
no warnings;
    my $class=shift;
    my $form=shift;
    open (my $self,$form,@_)
    #    or Carp::cluck "can't open $form@_: $!"
        ;
    return bless $self,$class;    # $self is a glob ref
    }

sub CLOSE { #Carp::cluck "\nCLOSE: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self=shift;
    return close $self;
    }

sub DESTROY { #Carp::cluck "\nDESTROY: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self=shift;
    $self->CLOSE;
    }

sub EOF { #Carp::cluck "\nEOF: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self = shift;
    return eof $self;
    }

sub FILENO { #Carp::cluck "\nFILENO: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self=shift;
    return fileno $self;
    }

sub OPEN { #Carp::cluck "\nOPEN: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self=shift;
    my $form=shift;
    $self->CLOSE;
    open($self,$form,@_)
        or croak "can't reopen '$form@_': $!";
    return 1;
    }

sub READLINE { #Carp::cluck "\nREADLINE: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
    my $self=shift;
    return undef
        if $self->EOF;
    #warn Data::Dumper->Dump([\(my $t=wantarray())],[qw(*wantarray)]),' ';
    if (wantarray()) { 
        my @a=<$self>;
        main::mySub(@a);
        return @a;
        }
    else {
        my $s=<$self>;
        main::mySub($s);
        return $s;
        };
    }

package main;
use strict;
use warnings;

my $name='mydata';

tie *FOO,"MyTie";
open(FOO,'<',$name)
    or die "Can't open '$name' for reading. $!";
my $line=<FOO>;
print "Scalar: $line";
$line=<FOO>;
print "Scalar: $line";
my @array=<FOO>;
print "Array: ",@array;
while (<FOO>) {
    print "In while: $_";
    }
close(FOO);

exit;

    sub mySub {
        warn "\nmain::mySub: ",Data::Dumper->Dump([\@_],[qw(*_)]),' ';
        return;
        };
__DATA__

##</code><code>##

package main;
use strict;
use warnings;

my $name='mydata';

my $FOO;
tie $FOO,"MyTie";
open($FOO,'<',$name)
    or die "Can't open '$name' for reading. $!";
my $line=<$FOO>;
print "Scalar: $line";
$line=<$FOO>;
print "Scalar: $line";
my @array=<$FOO>;
print "Array: ",@array;
while (<$FOO>) {
    print "In while: $_";
    }
close($FOO);

exit;