Object Utilities

(object? v) returns #t if v is a object, #f otherwise.

(class? v) returns #t if v is a class, #f otherwise.

(interface? v) returns #t if v is an interface, #f otherwise.

(class->interface class) returns the interface implicitly defined by class.

(object-interface object) returns the interface implicitly defined by the class of object.

(is-a? v interface) returns #t if v is an instance of a class that implements interface, #f otherwise.

(is-a? v class) returns #t if v is an instance of class (or of a class derived from class), #f otherwise.

(subclass? v class) returns #t if v is a class derived from (or equal to) class, #f otherwise.

(implementation? v interface) returns #t if v is a class that implements interface, #f otherwise.

(interface-extension? v interface) returns #t if v is an interface that extends interface, #f otherwise.

(ivar-in-interface? symbol interface) returns #t if interface (or any of its ancestor interfaces) defines an instance variable with the name symbol, #f otherwise.

(interface->ivar-names interface) returns a list of symbols for the instance variable names in interface (including instance variables inherited from superinterfaces).

(class-initialization-arity class) returns a value specifying the number of initialization arguments that are accepted when creating an instance of class. See arity in section 4.10.1 for information about arity values.