Another approach would be to treat ReadOnly and Singleton more like mixins, don't have them inherit from Base, and use NEXT something like this:
package Base;
sub new {
my $class = shift;
bless { @_ }, $class;
};
sub make_attr_subs {
my $self = shift;
$self->{Base_called} = 1;
};
package Singleton;
my %Singleton;
sub new {
my $class = shift;
return $Singleton{$class} ||= $class->NEXT::new(@_);
};
package ReadOnly;
use NEXT;
sub make_attr_subs {
my $self = shift;
$self->{ReadOnly_called} = 1;
$self->NEXT::make_attr_subs;
};
package ReadOnlySingleton;
use base qw(Singleton ReadOnly Base);
package main;
use Test::More 'no_plan';
sub new_object { ReadOnlySingleton->new };
isa_ok new_object(), 'ReadOnlySingleton';
is new_object(), new_object(), 'object is a singleton';
my $o = new_object();
$o->make_attr_subs;
ok $o->{Base_called}, 'make_attr_subs in Base called';
ok $o->{ReadOnly_called}, 'make_attr_subs in ReadOnly called';
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