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 Instances
 ---------
 
  - primitive procedure: class-of value
      Return the GOOPS class of any Scheme VALUE.
 
  - primitive procedure: instance? object
      Return `#t' if OBJECT is any GOOPS instance, otherwise `#f'.
 
  - procedure: is-a? object class
      Return `#t' if OBJECT is an instance of CLASS or one of its
      subclasses.
 
 Implementation notes: `is-a?' uses `class-of' and
 `class-precedence-list' to obtain the class precedence list for OBJECT.
 

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(goops.info.gz) Generic Functions