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Null object: Difference between revisions
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var ns: string not nil = nil # Compile time error</lang>
=={{header|Oberon-2}}==
{{works with|oo2c}}
<lang oberon2>
MODULE Null;
IMPORT
Out;
TYPE
Object = POINTER TO ObjectDesc;
ObjectDesc = RECORD
END;
VAR
o: Object; (* default initialization to NIL *)
BEGIN
IF o = NIL THEN Out.String("o is NIL"); Out.Ln END
END Null.
</lang>
{{out}}
<pre>
o is NIL
</pre>
=={{header|Objective-C}}==
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