_Is_A

Description

Checks to see whether a CORBA object is an instance of a class that implements a particular interface.

This function is used by PowerBuilder clients connecting to EAServer.

Applies to

CORBAObject objects

Syntax

corbaobject._Is_A ( classname )

Argument	Description
corbaobject	An object of type CORBAObject that you want to test
classname	The interface that will be used for the test

Returns

Boolean. Returns true if the class of the object implements the specified interface and false if it does not.

Usage

Before making a call to _Narrow, you can call _Is_A to verify that a CORBA object is an instance of a class that implements the interface to which you want to narrow the object.

Examples

Example 1

The following example checks to see that a CORBA object reference is an instance of a class that implements n_Bank_Account:

CORBAObject my_corbaobj

n_Bank_Account my_account

...

...

if (my_corbaobj._is_a("n_Bank_Account")) then

    my_corbaobj._narrow(my_account,"n_Bank_Account")

end if

my_account.withdraw(100.0)