slot-exists-p object slot-name → generalized-boolean

object — an object.

slot-name — a symbol.

generalized-boolean — a generalized boolean.

Returns true if the object has a slot named slot-name.

defclass, defstruct

defclass, slot-missing

Although no implementation is required to do so, implementors are strongly encouraged to implement the function slot-exists-p using the function slot-exists-p-using-class described in the Metaobject Protocol.