Re^4: DB_File modes

[Anonymous Monk]

Since you arent going to elaborate, I'll just go ahead and refute your claims

DB_File has contained this code longer than perl 5.5 has existed. The situation you describe is nigh impossible (bless would have to fail and return 1, TIEHASH would have to fail and return 1).

15 May 1997 http://search.cpan.org/~chips/perl5.004/

07 May 1997 http://cpansearch.perl.org/src/PMQS/DB_File-1.14/DB_File.pm

sub TIEHASH
{
    my $pkg = shift ;
 
    bless { VALID => { map {$_, 1} 
               qw( bsize ffactor nelem cachesize hash lorder)
             }, 
        GOT   => {}
          }, $pkg ;
}

If you intentionally return 1 , tied would return undef.

#!/usr/bin/perl --

use strict;
use warnings;

Main(@ARGV);
exit(0);

sub Main {
  Waha('NewHash');
  Waha('OneHash');
}

sub Waha {
  my $c = shift;
  my $obj = tie my (%foo), $c or die $!;
  printf '(%s) $obj=(%s) tied(%%foo)=(%s)' . "\n", $c, $obj,
    tied(%foo) || 'undef';
} ## end sub Waha

BEGIN {

  package NewHash;

  sub TIEHASH {
    my $obj = bless {}, shift;
    return $obj;
  }

  package OneHash;
  sub TIEHASH { "$_[0] is broken" }
} ## end BEGIN

__END__
(NewHash) $obj=(NewHash=HASH(0x3d8bbc)) tied(%foo)=(NewHash=HASH(0x3d8
+bbc))
(OneHash) $obj=(OneHash is broken) tied(%foo)=(undef)

(NewHash) $obj=(NewHash=HASH(0x225368)) tied(%foo)=(NewHash=HASH(0x225
+368))
(OneHash) $obj=(OneHash is broken) tied(%foo)=(undef)