| 1. | OLE servers and clients communicate with system libraries using virtual function tables, or VTBLs.
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| 2. | Some programming languages provide explicit language support for protocols or interfaces ( pure virtual functions.
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| 3. | The message-handling macros replaced the virtual function mechanism provided by C + +.
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| 4. | Virtual functions are resolved'late '.
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| 5. | A class containing a pure virtual function is called an " abstract class ".
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| 6. | This mechanism avoided saturating the OO virtual function system with one function for each window message.
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| 7. | But instead, because it has a different signature, it creates a second virtual function.
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| 8. | The " fix " function accesses the function to be fixed as a virtual function.
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| 9. | Pure virtual functions can also be used where the method declarations are being used to define an Java programming language.
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| 10. | To elaborate on the above example, consider a base class with "'no virtual functions " '.
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