Re: anyone define port types?

[Marko Rauhamaa <marko@pacujo.net>]

Jan Wedekind <jan@wedesoft.de>:

> On Wed, 30 Mar 2016, Marko Rauhamaa wrote:
>> GOOPS' has the worst possible object model: objects are seen as mere
>> data records. The concept of a "slot" is an anathema to OOP.
>
> Ok, I have updated the example to use accessor functions instead of
> "slot-ref".

(get-x) is only a fig leaf for (slot-ref). In general, no user of an <a>
object should think the object holds a piece of information called x.
Instead, you should be interacting with the abstract object <a>.

Python people call it duck-typing.

Java, Go et al use interfaces.

Even C can do opaque structs.

C++ suffers from "private" data members, and GOOPS strips away even that
thin veil.

Remember:

   [...] during her journey south to be married, the young queen-to-be
   passed through a town that was famed for its silk stockings, then
   rare and expensive items. Wishing to show her due courtesy, the
   merchants of the town offered to present her with a pair. [...] The
   Queen’s courtiers were aghast at this embarrassing breach of decorum,
   regarded as both indecent and audacious, and one replied loftily that
   “The Queen of Spain has no legs”.
   <URL: http://www.worldwidewords.org/qa/qa-que2.htm>


Marko