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Re^3: Trying to understand Perl Objectsby morgon (Priest) |
on Apr 04, 2009 at 22:30 UTC ( [id://755488]=note: print w/replies, xml ) | Need Help?? |
Here an example for association:
package Rider; sub new { my($pck, $name)=@_; return bless { name => $name }, $pck; }This is a Rider-class with a "name"-attribute, you can create new instances with Rider->new("John Wayne"). Now a horse with a rider:
package Horse; sub new { my($pck, $horse_name, $rider_name)=@_; return bless { name => $horse_name, rider => Rider->new($rider_name), }, $pck; } You can create instances with Horse->new("Mr Ed", "John Wayne"). The created class will have a "rider"-attribute which is an instance (= blessed reference) of the rider-class. So yes you simply store the object-references in your underlying data-structure. And by the way: The reason I bless not directly into "Rider" and "Horse" namespaces but rather use the package-name that the constructor gets passed when called via e.g. Rider->new (you should NOT call it as Rider::new) is so that I can re-use the constructor in a derived class - read Damian's book if this is unclear. hth
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