Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Compiler error C2569
 
     'identifier' : union cannot be used as a base class
 
     A class was derived from the specified union.
 
     A union is not allowed to be a base class. If another user-defined
     type must be derived from the specified union, the union should
     be changed to a class or structure.
                                    -♦-