[Openmcl-devel] Custom Meta Classes
Sven Van Caekenberghe
sven at beta9.be
Mon Jan 19 06:07:33 PST 2004
We still have problems with this issue, specifically the following file
can be compiled but cannot be loaded into 0.14-031220:
(defpackage :foo (:use :cl))
(defclass my-meta-class (standard-class)
(defmethod validate-superclass ((class my-meta-class) (super
(defclass foo ()
When I define the same code in cl-user it works...
On 16 Jan 2004, at 03:12, Gary Byers wrote:
> On Thu, 15 Jan 2004, Gary Byers wrote:
>> On Thu, 15 Jan 2004, Sven Van Caekenberghe wrote:
>>> In OpenMCL 0.13.x I could define my own meta classes like this:
>> i.e., without having to define one or more VALIDATE-SUPERCLASS
>> methods which describe which subclass relationships between instances
>> of your new metaclass and those of other metaclasses make sense.
>>> This works in LispWorks 4.3 as well.
> Just to beat a dead horse, googling for "validate-superclass"
> revealed (among other things):
>> From your experience and from what I can infer from that page, it
> would appear that LW may provide a VALIDATE-SUPERCLASS method
> that allows the "other-class, STANDARD-CLASS" case. That minor
> deviation from the MOP might be less confusing to most people,
> and could always be overridden by a method whose first parameter
> had higher precedence than that default.
> (Googling does suggest that this whole issue's confusing to many
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