Release 10.1A: OpenEdge Development:
Progress 4GL Reference

TYPE-OF function

Verifies that the object instance to which the specified object reference applies is an instance of the specified class type, inherits from the specified super class, or implements the specified interface. If the object reference represents an object instance of the specified type, the function returns TRUE. Otherwise, it returns FALSE.

Syntax

TYPE-OF ( object-reference, type-name ).

object-reference

An object reference for a user-defined class object instance.

type-name

A character string that specifies the type name of a class, a super class, or an interface. Specify a type name using the package.class-name syntax as described in the Type-name syntax reference entry in this book.