We had talked about this some time ago and it's been rattling around in my brain so I wanted to write it down into a formal proposal where we can discuss it and hopefully agree upon a syntax. Everything is preliminary and tentative but this is a syntax which allows a "composition over inheritance" model, also known as "mix-ins" in some languages. That idea is similar to multiple inheritance except you have a concrete reference to the trait being implemented so you can resolve conflicts easily.
Here's what I have so far. Please feel free to look at it and give any feedback. https://github.com/genericptr/freepascal/wiki/Traits-Proposal ==================== type TSomeTrait = trait public field: integer; procedure DoThis; end; TMyClass = class private _trait: TSomeTrait; public property someTrait: TSomeTrait implements _trait; end; var c: TMyClass; begin c := TMyClass.Create; c.DoThis; writeln(c.field): end; Regards, Ryan Joseph _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
