I try to understand the underlying model for object, class, metaclass
(source excerpt at the end of the mail). Not easy...
I can't find a suitable definition for the ??? below.
Extracted from rexxref :
5.1.1
The Object class is the root of the class hierarchy.
The instance methods of the Object class are, therefore, available on all
objects.
[JLF] The class methods of the Object class are ???
5.1.2
The Class class is like a factory that produces the factories that produce
objects. It is a subclass of the
Object class.
The instance methods of the Class class are also the class methods of all
classes.
[JLF] The class methods of the Class class are ???
4.1.4
A metaclass is a class you can use to create another class. The only
metaclass that Rexx provides is .Class, the Class class. The Class class is
the metaclass of all the classes Rexx provides. This means that instances of
.Class are themselves classes.
[JLF] The instance methods of a metaclass are ??? : [proposition] the class
methods of all the classes associated to this metaclass.
[JLF] The class methods of a metaclass are ???
What is a scope ? (I see scopes and metaClassScopes in the source excerpt).
Is there any publication that gives a big picture of this data model ?
In particular, I try to put in words the actions done by these methods :
~instanceMethods
~methods
~send
Source excerpt :
ObjectClass.hpp
class RexxInternalObject : public RexxVirtualBase{
inline RexxBehaviour *getObjectType() { return behaviour; }
-----
RexxBehaviour *behaviour; /* the object's behaviour
*/
class RexxObject : public RexxInternalObject {
inline RexxBehaviour *behaviourObject() { return this->behaviour; }
RexxBehavious.hpp
class RexxBehaviour : public RexxInternalObject
{
inline RexxTable *getMethodDictionary() { return
this->methodDictionary; };
RexxIdentityTable *scopes; /* scopes
table */
RexxTable *methodDictionary; /* method dictionary
*/
RexxClass *owningClass; /* class that created this object
*/
RexxTable *instanceMethodDictionary; /* methods added via
SETMETHOD */
ClassClass.hpp
class RexxClass : public RexxObject {
RexxTable *classMethodDictionary; // class methods specific to
this class
RexxBehaviour *instanceBehaviour; // instances of this class inherit
this behaviour
RexxTable *instanceMethodDictionary; // methods added to this
class
---------
RexxClass *baseClass; // Baseclass of this class
RexxArray *metaClass; // Metaclass of this class
RexxArray *metaClassMethodDictionary; // Metaclass mdict
RexxIdentityTable *metaClassScopes; // Metaclass scopes
---------
RexxArray *classSuperClasses; // The superclass and any
inherited mixins for class behaviour
RexxArray *instanceSuperClasses; // The superclass and any
inherited mixins for instance behaviour
---------
RexxList *subClasses; // our list of weak referenced
subclasses
Jean Louis
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