[Pyrex] declear opaque type

[Greg Ewing]

"King C. Shu" <kingshu at myrealbox.com>:

> I just want to point out that Python C API has a PyCObject which can
> wrap an opaque C type.

I don't think I'd recommend using it, though. If an unknown
piece of Python code passes you a PyCObject, you have no way
of knowing whether it's wrapping a C object of the type
you're expecting. Better to define an extension type for
the purpose, then you get full type checking.

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
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