Recently, "Thomas Heller" <thomas.heller@ion-tof.com> said:
> Here's an outline which could work in 2.2:
This sounds very good! There's only one thing you'll have to explain
to me: how would this work from C? My types are all in C, not in
Python, so I'd need to do the magic in C. Where do I find examples of
using metatypes from C?
I could then put all this wrapper stuff in a file WrapperObject.c and
it would be reusable by any object that wanted this functionality.
> Create a subtype of type, having a tp_convert slot:
>
> typedef int (*convert_func)(PyTypeObject *, void **);
>
> typedef struct {
> PyTypeObject type;
> convert_func tp_convert;
> } WrapperTypeType;
>
> and use it as metaclass (metatype?) for your WindowObj:
>
> class WindowObj(...):
> __metaclass__ = WrapperTypeType
>
> Write a function to return a conversion function:
>
> convert_func *get_converter(PyTypeObject *type)
> {
> if (WrapperTypeType_Check(type))
> return ((WrapperTypeType *)type)->tp_convert;
> /* code to check additional types and return their converters */
> ....
> }
>
> and then
>
> if (!PyArg_ParseTuple(args, "O&", get_converter(WinObj_Type), &Window))
>
> How does this sound?
>
> Thomas
>
>
--
- Jack Jansen <Jack.Jansen@oratrix.com> http://www.cwi.nl/~jack -
- If I can't dance I don't want to be part of your revolution -- Emma Goldman -
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4