[pypy-dev] Builtin types

[Christian Tismer]

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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