instanceOf

instanceOf* ( object : object , class : object ) : boolean

Parameter	Type		Description
object	object	→	Object whose class is to be tested
class	object	→	Class to test belongship
Result	boolean	←	True if object belongs to the specified class or a child class, and false otherwise

Description

The instanceOf command returns returns true if object belongs to class or to one of its child classes, and false otherwise.

If class is not a valid Class object, the error -10745 is returned.

note

Each time a class's sources are modified, a new Class object is generated. As previously instantiated objects do not belong to the new class, objectClass will return false if you pass a Class object other than the one used for instantiation.

Example

You created the Polygon class:

  //Class: Polygon

 constructor(size1 : integer, size2 : integer)
 this.area = size1*size2

Then, in a method, you can write:

 var poly : object
 var instance : boolean
 poly = cs.Polygon.new(4,3)

 instance = instanceOf(poly,cs.Polygon) //true
 instance = instanceOf(poly,4D.Object) //true
 instance = instanceOf(poly,cs.Circle) //false

See also

objectClass