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Delphi (and probably a lot of other languages) has class helpers. These provide a way to add extra methods to an existing class. Without making a subclass.
So, what are good uses for class helpers?
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I'm using them:
To add methods to the TStrings class so I can use the same methods in my derived lists and in TStringList.
TGpStringListHelper = class helper for TStringList public function Last: string; function Contains(const s: string): boolean; function FetchObject(const s: string): TObject; procedure Sort; procedure Remove(const s: string); end; { TGpStringListHelper } To simplify access to record fields and remove casting.
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