Michael Van Canneyt via fpc-pascal wrote:
On Tue, 9 Feb 2021, Ryan Joseph via fpc-pascal wrote:
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
In general, I am charmed by this idea.
I am, in whatever form it is implemented, also a proponent of the basic idea behind it, formulated
on Ryan's page as:
"Traits allow a "composition over inheritance" model which complement the existing single
inheritance model introduced in Object Pascal. Traits are similar to multiple inheritance in
languages such as C++ and Java, with the difference being an explicit reference to the class (or
trait) which is being implemented."
Regards,
Adriaan van Os
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