If a constructor is inherited, it needs to bless into a class that is not its own. As in: 
package CLASS_B;
sub new {
  my $class = shift; # critical here
  bless { @_ }, $class; # blesses to maybe CLASS_A
}
package CLASS_A;
@ISA = qw(CLASS_B);
...
my $object = CLASS_A->new;

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This calls, CLASS_A::new, which inherits to CLASS_B::new, which blesses the hashref into CLASS_A, not CLASS_B. Does that help?

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

In reply to •Re: bless!! by merlyn
in thread bless!! by bakunin

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