Override (keyword)

From RemObjects Software

This is a Oxygene Language Feature topic
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Supply to override a virtual class member.

Applies to

• Properties
• Methods
• Events

Override Prevention

To prevent a member from being overridden, see final and to stop any member see Sealed Classes.

Example of virtual and override

type
  Class1 = class
    procedure Show; virtual; empty;
  end;

  Class2 = class(Class1)
    procedure Show; override;
    procedure Test;
  end;

Note the use of empty here. An implicit empty implementation of Show is provided for Class1. Class2 does not need to provide an overridden Show method. If, however, Class1 was declared as follows, then Class2 would need to declare Show, otherwise it would be an abstract class too:

type
  Class1 = class
    procedure Show; abstract;
  end;

See Also

• Abstract Classes
• virtual
• final
• Sealed Classes
• Class Member Modifiers

Product: RemObjects Oxygene (formerly known as Chrome)
Current version: 3.0 Previous Versions: 'Joyride' (2.0), 'Floorshow' (1.5), 'Adrenochrome' (1.0)

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