Class operators are slightly different from the operators above in the sense that they can only be used in class expressions which return a class. There are only 2 class operators, as can be seen in table (9.8).
An expression containing the is operator results in a boolean type. The is operator can only be used with a class reference or a class instance. The usage of this operator is as follows:
This expression is completely equivalent to
If Object is Nil, False will be returned.
The following are examples:
The as operator performs a conditional typecast. It results in an expression that has the type of the class:
This is equivalent to the following statements:
Note that if the object is nil, the as operator does not generate an exception.
The following are some examples of the use of the as operator: