I'm confused, in my book is new() reserved for object constructors not classes.

Inheritance for classes should be easier done by 

use strict;
use warnings;
use Data::Dump qw/pp dd/;




package Class1 {
    our %cfg = (a => 1, b=>2);
    sub cfg { %cfg }
};

package Class2 {
    use parent -norequire, 'Class1';
    our %cfg = ( %Class1::cfg, a=>11,c=>33 );
};

package Class3 {
    use parent -norequire, 'Class2';
    our %cfg = ( %Class2::cfg, b=> 222 );
};

pp
  \%Class1::cfg,
  \%Class2::cfg,
  \%Class3::cfg;



# **** THIS DOESN'T WORK

package Class2b {
    use parent -norequire, 'Class1';
    our %cfg = ( SUPER->cfg(), a=>11,c=>33 );
};

pp {Class1->cfg()},
  \%Class2b::cfg;

[download]

Please note that I couldn't make it work with SUPER, ( but I'm no SUPER expert anyway ;-)

(
  { a => 1, b => 2 },
  { a => 11, b => 2, c => 33 },
  { a => 11, b => 222, c => 33 },
)
Can't locate object method "cfg" via package "SUPER" (perhaps you forgot to load "SUPER"?) at d:/tmp/pm/class_cfg.pl line 32.

Compilation exited abnormally with code 255 at Fri Feb 21 00:04:51

edit

ah I misread perlobj

> The SUPER modifier can only be used for method calls. You can't use it for regular subroutine calls or class methods:

update

This works, albeit with ugly syntax. 

...
package Class2b {
    use parent -norequire, 'Class1';
    our %cfg = ( __PACKAGE__->SUPER::cfg(), a=>11,c=>33,n=>'2b' );
};

pp \%Class2b::cfg;

[download]

{ a => 11, b => 2, c => 33, n => "2b" }

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^2: Inheritable configuration options.... but with default values? by LanX
in thread Inheritable configuration options.... but with default values? by Amblikai

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