The problem with calling multiple constructors is that it results in an object that only contains the results of the last constructor. What is really needed is a seperation of the creation and initialization steps in each class.

Here is the method I use (essentially a cut and paste from Chapter 6 of Damian Conway's excellent book Object Oriented Perl) as it applies to this particular problem: 
#!/usr/bin/perl -w
use strict;
use Employee;

my $hid = Employee->new;

print "My gender is " . $hid->gender() . "\n";
print "My name is " . $hid->fullname() . "\n";



package Employee;
use strict;

use _Initializable;
use Person;
use Gender;

@Employee::ISA = qw( _Initializable Person Gender );

sub _init {
  my $self = shift;

  $self->Person::_init();
  $self->Gender::_init();
}

1;



package Person;
use strict;

use _Initializable;

@Person::ISA = qw( _Initializable );

sub _init {
   my $self = shift;

   $self->{FULLNAME} = "Robert Walkup";    
}

sub fullname {
   my $self = shift;

   return $self->{FULLNAME};
}

1;



package Gender;
use strict;

use _Initializable;

@Gender::ISA = qw( _Initializable );

sub _init {
   my $self = shift;

   $self->{GENDER} = "MALE";
}

sub gender {
   my $self = shift;

   return $self->{GENDER};
}

1;



package _Initializable;
use strict;

sub new {
   my $class = shift;
   my $self = {};

   bless $self, ref($class) || $class;

   $self->_init();

   return $self;
}

1;

[download]
As you can see, the only major change is the addition of the _Initializable class to handle the creation of new objects, and the _init methods to initialize said objects. For any method other than a constructor, the options listed by lachoy above should work as advertised.

Vavoom

In reply to Re: Re: how do I do multiple inheritance by Vavoom
in thread how do I do multiple inheritance by rdww

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