Author: tewk Date: Sun Oct 29 16:40:33 2006 New Revision: 15053 Modified: trunk/docs/pdds/clip/pdd15_objects.pod
Log: [Ruby] Start to list Ruby's OO needs Modified: trunk/docs/pdds/clip/pdd15_objects.pod ============================================================================== --- trunk/docs/pdds/clip/pdd15_objects.pod (original) +++ trunk/docs/pdds/clip/pdd15_objects.pod Sun Oct 29 16:40:33 2006 @@ -10,6 +10,24 @@ implementers to list the OO-related needs of their language in so as to aid that. +=head2 PMCS + +Ruby: Just like small talk, everything is an object. I'm hoping to be able to +implement core Ruby classes(String, Array, Hash, Module, etc) something like this. + +ParrotClass + | + RubyClass String + | | + \ / + RubyString + +=head2 Objectspace + +Ruby: Objectspace in ruby allows the programmer to iterate through every live object +in the system. There is some debate about how to make this play nice with different +garbage collection schemes. + =head2 Classes A class is a collection of methods and attributes. It would be desirable, for those classes whose definition is fully known at compile time, to have a @@ -17,6 +35,9 @@ into a PBC file rather than created at runtime. However, creation of new classes at runtime will be needed too. +=head2 Meta-classes +Ruby: Ruby has meta classes. It would be nice if classes were objects in Parrots OO model. + =head2 Attributes Attributes are instance data associated with a class (or role, however those are supported). They may not always be of a type specified by a PMC, though @@ -27,13 +48,15 @@ .Net: Attributes may be private (not externally visible), public (always externally visible), protected (only visible to subclasses) and internal -(only visible inside the current assembly - the closest correspondnece in +(only visible inside the current assembly - the closest correspondence in Parrot is perhaps only visible inside the same PBC file). Additionally, it is allowable for a subclass to introduce an attribute of the same name as the a parent class has, and they both exist depending on what type an instance of the class is currently viewed as being (read: there is a difference between the type of the reference and the type of the value). +Ruby: Attributes can be dynamically added and removed at runtime. + =head2 Methods Perl 6: Methods may be public (anyone can invoke them) or private (only invokable by the class they are defined in). Additionally, submethods are @@ -41,6 +64,9 @@ .Net: Like attributes, methods may be public, private, protected or internal. +Ruby: has a method_missing that gets called when method resolution fails to find a method. +Methods can be dynamically added and removed at runtime. + =head2 Constructors A constructor is run when an object is instantiated. @@ -53,13 +79,15 @@ .Net: Single inheritance. +Ruby: Single inheritance but support for mixins of ruby modules. + =head2 Interfaces An interface specifies a set of methods that must be implemented by a class that inherits (or implements) the interface, but does not provide any form of implementation for them. .Net: Interfaces are pretty much what was just describe above. XXX Need to -check behaviour of you implement two interfaces with methods of the same name. +check behavior of you implement two interfaces with methods of the same name. =head2 Roles A role consists of a set of methods and attributes. It cannot be instantiated
