Perl 6
SMOP p6opaque Implementation: Revision 5
The p6opaque Responder Interface is the default responder for all Perl 6 objects.

^ Basics

This is a prototype-based OO system. It means that a class is simply an undefined object. The following assumptions help to understand it:

* $object.WHAT() === $prototype
* $prototype.WHAT() === $prototype
* $object.HOW() === $prototype.HOW()
* $object.clone.WHAT() === $object.WHAT()
* $object.clone.HOW() === $object.HOW()
* $prototype.clone.HOW() !=== $prototype.HOW()

This stablishes the following relationships:

* Every object have a prototype
* Every object is defined
* Every prototype is undefined
* A prototype is its own prototype
* Every prototype have its own metaclass instance
* When cloning an object, the prototype information is cloned, therefore it points to the same prototype.
* When cloning a prototype, the metaclass information is cloned and it becomes a new prototype, therefore it has a different metaclass instance.

^ Implementation

* Both the prototype and the object are objects
* An object is composed by slots
* the slots in the object store what is described by the prototype
* the slots in the prototype describes the prototype

^ Composition

This is a hard topic in Perl 6, as compositions are mostly unpredictable (unless the class is closed). This way the composition is made with a "composition pile", where every composition operation is put in order, allowing correct method resolution.

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