so if I have:
cdef class IplImage:
cdef c_lib.IplImage* thisptr
cdef class CvMat:
cdef c_lib.CvMat* thisptr
then I can just do this?
def exposedPythonFunc(image): where image can be an IplImage or CvMat
c_lib.cFunction(image.thisptr) since I know thisptr exists
or must I do?
def exposedPythonFunc(image):
if isinstance(image, IplImage):
c_lib.cFunction(image.thisptr)
elif isinstance(image, CvMat):
c_lib.cFunction(image.thisptr)
else:
raise NotImplementedError
Thanks!
Chris
On Fri, May 22, 2009 at 12:50 AM, Dag Sverre Seljebotn <
[email protected]> wrote:
> Hi Chris,
>
> > the problem is that the C library has several functions that will accept
> > one
> > of many types of arrays.
> >
> > The function parameter type is CvArr whose definition is (in C):
> >
> > typedef void CvArr;
> >
> > and the functions are declared as accepting CvArr* types as arguments.
> >
> > two of the types I am wrapping are IplImage and CvMat both of which can
> be
> > passed as CvArr*.
> >
> > I would like to make python callable functions that accept either
> instance
> > of IplImage or CvMat (which I have created as extension types).
> >
> > Unfortunately, i haven't yet been able to figure it out through various
> > tinkering with subclassing, casting, or void pointers....
>
> Note that
>
> def f(CvMat foo): ...
>
> is almost exactly the same as
>
> def f(foo):
> if not isinstance(foo, CvMat): raise some error...
>
> So, what you do is
>
> def f(obj):
> if isinstance(foo, CvMat): (a)
> elif isinstance(foo, IplImage): (b)
> else: raise some error
>
> Dag Sverre
>
> _______________________________________________
> Cython-dev mailing list
> [email protected]
> http://codespeak.net/mailman/listinfo/cython-dev
>
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