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Prevent Derivation◄╣

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Prevent Derivation (Delphi and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Delphi versus Corel Paradox: A side by side comparison between Delphi and Corel Paradox.

OOP Details

More object oriented (OO) stuff.

Prevent Derivation

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How do you prevent another class from inheriting and/or prevent a class from overriding a member.

Delphi: "Sealed class" sealed, final

With Delphi, use the sealed keyword to prevent a class from being inherited from and use the final keyword to prevent a method from being overridden.

Syntax Example:

type

  Robot = class sealed(TObject)
  public
    procedure Speak(pSentence: String); virtual; final;
  end;

Delphi Sealed class (sealed, final) 1 certification question.

Corel Paradox: Not Supported