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Showing content from http://www.lispworks.com/documentation/HyperSpec/Body/f_clas_1.htm below:

CLHS: Function CLASS-OF

Syntax:

class-of object => class

Arguments and Values:

object---an object.

class---a class object.

Description:

Returns the class of which the object is a direct instance.

Examples:

 (class-of 'fred) =>  #<BUILT-IN-CLASS SYMBOL 610327300>
 (class-of 2/3) =>  #<BUILT-IN-CLASS RATIO 610326642>
 
 (defclass book () ()) =>  #<STANDARD-CLASS BOOK 33424745>
 (class-of (make-instance 'book)) =>  #<STANDARD-CLASS BOOK 33424745>
 
 (defclass novel (book) ()) =>  #<STANDARD-CLASS NOVEL 33424764>
 (class-of (make-instance 'novel)) =>  #<STANDARD-CLASS NOVEL 33424764>

 (defstruct kons kar kdr) =>  KONS
 (class-of (make-kons :kar 3 :kdr 4)) =>  #<STRUCTURE-CLASS KONS 250020317>

Affected By: None.

Exceptional Situations: None.

See Also:

make-instance, type-of

Notes: None.

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