To add an example, I have a toy project Filesys::DB, and there are various maintenance operations for the database:

  1. Scan new entries
  2. Scan existing entries for changes
  3. Maintenance of cache tables
  4. ...

First I also had these within the scripts implementing these operations. Then I moved them into Filesys/DB.pm, and now I have Filesys/DB/Operation.pm, in which these operations live. In the longer run, the operations will likely move into their own sub-files.

As an example, moving a method from the main class into another module/class can be done like this with Moo:

# Old version
package My::Example;
use 5.020;
use Moo 2;
use experimental 'signatures';

sub do_foo( $self, %options ) {
    ...
}

[download]
# New version version
package My::Example;
use 5.020;
use Moo 2;
use experimental 'signatures';

has 'operation_foo' => (
    is => 'lazy',
    default => sub {
        My::Example::Operation::Foo->new(),
    },
    handles => ['do_foo'],
);

package My::Example::Operation::Foo;
use 5.020;
use Moo 2;
use experimental 'signatures';

sub do_foo( $self, %options ) {
    ....
}

[download]

Using objects for holding code mostly makes sense if the operations don't really need information that lives in the "parent" class.

Update: choroba spotted a misspelled does where it should have been handles.

In reply to Re^3: multiple inheritance alternative(s)? by Corion
in thread multiple inheritance alternative(s)? by Danny

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