Object System

I suggest reading the Object Orientation in Perl is just a Design Pattern page first, it will help, this page is more about the specifics of the implementation.

My proposal is to add to the list of magic variables with;

• %HAS – this contains a key for every slot expected in the instance, the value associated with that key is a CODE reference which can be called to provide a default value for the slot.
• @DOES – much like @ISA this would contain strings (package names) to be composed in as a role

Then to establish some conventions such as;

• predeclared subroutines are treated as abstract methods
• standard instance creation protocol
  • most easily done with a common base class (mop::object)