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Assignment for objects – PB Docs 126 – PowerBuilder Library

Assignment for objects – PB Docs 126

Assignment for objects

Declaring an object variable declares an object reference:

Using the CREATE statement creates an instance
of the object:

When you assign one object variable to another, a reference
to the object instance is copied. Only one copy of the object exists:

Ancestor and descendent objects

Assignments between ancestor and descendent objects occur
in the same way, with an object reference being copied to the target
object.

Suppose that uo_emp_data is
an ancestor user object of uo_emp_active and uo_emp_inactive.

Declare variables of the ancestor type:

Create an instance of the descendant and store the reference
in the ancestor variable:

Assigning uo_emp1 to uo_emp2 makes
both variables refer to one object that is an instance of the descendant uo_emp_active:

For information about passing objects as function
arguments, see “Passing arguments to functions
and events”
.


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