Re: [slang-users] Can you do OO in Slang?

["John E. Davis" <jed@xxxxxxxxxxx>]

Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx> wrote:
> in one of the posts that announced a new libslang version I've noticed a
> syntax that seems to be an inheritance, i.e.:
>
>    car = struct { name, price, max_velocity}
>    truck = struct {@car, max_load};
>
> Now truck includes all the fields that car has. I wonder however if you can
> cast a truck at a car, to pass it to a generic car-related function? Is
> there casting in slang?

Yes, you can pass truck to a routine that expects a car as long as all
of the fields that the car function needs are present ("duck typing").
The SLxfig module <https://www.jedsoft.org/fun/slxfig/> makes
extensive use of this approach.  --John
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