On 12/19/24 10:49 AM, sfp wrote:
> Subject lines says it all
Although you clearly have a need for, virtual operators haven't been
common in my experience. I always felt they could cause semantic issues.
For example, the two subclasses of an interface may not have the binary
relation that the interface prescribes. I can think of the Animal
hierarchy where Cat and Dog may have a certain relationship that may not
make sense between Alligator and Mouse. Forcing such a binary function
at the Interface level may not be right.
Having said that, and to contradict myself, this discussion reminded me
of a fun DConf presentation by our friend Jean-Louis Leroy that included
examples of such virtual functionality where it made sense:
"Open Methods for D (The Expression Problem - solved)"
https://www.youtube.com/watch?v=MpwHeE2Vvfw&t=395s
But it uses his magical implementation (enabled by D) of open methods
(and multi-methods).
Ali
