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|
#!/usr/bin/perl
use strict;
use warnings;
use Fatal qw(open read);
use Symbol;
use Data::Dumper;
use Scalar::Util;
use IO::File;
use English qw( -no_match_vars );
use Carp;
## no critic (Miscellanea::ProhibitTies)
package MyTiedFileHandle;
use English qw( -no_match_vars );
use Carp;
my $leaky_file_handle;
sub TIEHANDLE {
my ($class) = @_;
my $i;
my $tied_object = bless \$i, $class;
$leaky_file_handle = $tied_object;
return $tied_object;
} ## end sub TIEHANDLE
sub PRINT {
my ( $r, @rest ) = @_;
${$r}++;
print join( $OFS, map { uc $_ } @rest ), $ORS
or Carp::croak("Cannot print to STDOUT: $ERRNO");
return;
} ## end sub PRINT
## no critic (Subroutines::RequireArgUnpacking)
sub READ {
my $bufref = \$_[1];
## use critic
## no critic (Miscellanea::ProhibitTies)
my ( $self, undef, $len, $offset ) = @_;
defined $offset or $offset = 0;
${$bufref} .= 'a';
return 1;
} ## end sub READ
package MyTie;
my $leaky;
sub TIESCALAR {
my ($class) = @_;
my $tobj = bless {}, $class;
$leaky = $tobj;
return $tobj;
} ## end sub TIESCALAR
sub TIEHASH {
goto \&TIESCALAR;
}
sub FIRSTKEY {
return; # no keys
}
sub TIEARRAY {
goto \&TIESCALAR;
}
sub FETCH {return}
sub FETCHSIZE {
return 0; # no array elements
}
sub TIEHANDLE {
goto \&TIESCALAR;
}
package main;
my $scalar = 42;
my $scalar_ref = \$scalar;
my $ref_ref = \$scalar_ref;
my $regexp_ref = qr/./xms;
## no critic (Subroutines::ProhibitCallsToUndeclaredSubs)
my $vstring = v1.2.3.4;
## use critic
my $vstring_ref = \$vstring;
our $GLOB_HANDLE_NAME;
our $IO_HANDLE_NAME;
our $AUTOVIV_HANDLE_NAME;
our $FH_HANDLE_NAME;
my $glob_ref = *GLOB_HANDLE_NAME{'GLOB'};
my $io_ref = *IO_HANDLE_NAME{'IO'};
my $fh_ref = do {
no warnings qw(deprecated);
*FH_HANDLE_NAME{'FILEHANDLE'};
};
## no critic (InputOutput::RequireBriefOpen)
open my $autoviv_ref, q{<}, '/dev/null';
## use critic
my $string = 'abc' x 40;
my $lvalue_ref = \( pos $string );
${$lvalue_ref} = 7;
my %data = (
'scalar' => $scalar_ref,
'ref' => $ref_ref,
'regexp' => $regexp_ref,
'vstring' => $vstring_ref,
'lvalue' => $lvalue_ref,
'glob' => $glob_ref,
'autoviv' => $autoviv_ref,
);
my %star_deref = map { ( $_, 1 ) } qw(glob autoviv);
REF:
while ( my ( $name, $ref ) = each %data ) {
print "$name: ", ( ref $ref ), q{,}, ( Scalar::Util::reftype $ref), q{: }
or Carp::croak("Cannot print to STDOUT: $ERRNO");
my $return;
if ( $star_deref{$name} ) {
## no critic (Miscellanea::ProhibitTies)
$return = eval { tie *{$ref}, 'MyTiedFileHandle'; 1 };
## use critic
}
else {
## no critic (Miscellanea::ProhibitTies)
$return = eval { tie ${$ref}, 'MyTie'; 1 };
## use critic
}
print $return ? "ok\n" : "tie failed: $EVAL_ERROR"
or Carp::croak("Cannot print to STDOUT: $ERRNO");
my $underlying = q{};
if ( $star_deref{$name} ) {
$underlying = tied *{$ref};
}
else {
$underlying = tied ${$ref};
}
print Data::Dumper->Dump( [$underlying], ['underlying'] )
or Carp::croak("Cannot print to STDOUT: $ERRNO");
} ## end while ( my ( $name, $ref ) = each %data )
exit 0;
|
