[pypy-dev] Builtin types
Christian Tismer
tismer at tismer.com
Fri Jan 24 17:08:56 CET 2003
Thomas Heller wrote:
> Christian Tismer <tismer at tismer.com> writes:
...
>>No, sorry. object is just a special case for deriving a
>>new-style class, see above.
>>They can also be created by deriving from builtin types,
>>or by using __slots__.
>
> That's incorrect, IIUC.
>
> __slots__ only has a special meaning for *new stype classes* only,
> it doesn't trigger anything in classes classes.
Yes, I forgot about that, you are right.
>>Furthermore, I'm going to propose an extension to the new
>>class system (at least for the MiniPy prototype) that goes
>>a bit further:
>>- __slots__ should get the ability to denote the type of
>> a slot to be generated, especially ctypes types
>
>
> I'm not really understanding what you're proposing here.
I am trying to extend the new-style classes
that includes ctypes, somehow.
> You could look at ctypes as implementing 'typed slots' with
> C-compatible layout.
How is that so different from my idea?
...
>>- it should be possible to derive a class from nothing,
>> not even from object or classic, but I'd like to describe
>> a plain C structure by classes.
>
>
> This is maybe also something that ctypes already does.
> The B *class* above knows all about this C structure
>
> struct B {
> char x;
> int y;
> long long z;
> };
>
>
>>>>ctypes.sizeof(B)
>
> 16
However, we have the same intent.
ciao - chris
--
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