Question

How do I see if one CLOS class is a subclass of another CLOS class?

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Solution

You can get the CLASS-NAME of a class.

A class has also a type of the same name.

SUBTYPEP tests if a type is a subtype of another type.

OTHER TIPS

closer-mop provides a subclassp predicate

CL-USER> (c2mop:subclassp (find-class 'condition) (find-class 'error))
NIL
CL-USER> (c2mop:subclassp  (find-class 'error) (find-class 'condition))
T
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