[bump]
Stefan Behnel, 10.01.2010 18:23:
> [...] why not just represent a borrowed reference as a pointer?
> So you could write
>
> cdef list some_list = []
> cdef list* borrowed_ref = some_list
>
> and borrowed_ref would be a non-refcounted pointer to a Python list.
> Assignments back to a normal reference would be allowed:
>
> cdef list my_list = borrowed_ref # increfs the pointer
>
> After all, a non-refcounted reference to a Python object is not more than a
> bare pointer to a well-defined Python builtin/extension type (including
> "object*").
What do the others think about this?
Note that this does not relate to the "stolen reference" case, for which
Robert already proposed a "steal()" function (and which I expect to be a
rare use case anyway). It only deals with borrowed references, where e.g.
PyTuple_GET_ITEM() would be declared as
cdef object* PyTuple_GET_ITEM(object t, Py_ssize_t index)
and Cython would automatically do the right thing when you write
cdef object x = PyTuple_GET_ITEM(t, 0)
or
cdef object* x = PyTuple_GET_ITEM(t, 0)
respectively. The only drawback I see with this syntax is that you can't write
cdef object x = PyTuple_GET_ITEM(t, 0)[0]
which you'd normally do with a pointer...
Stefan
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