[Numpy-discussion] SWIGed function does not like my boolean array

Sebastian Haase haase@msg.ucsf....
Wed Nov 7 09:08:39 CST 2007


O.K., so sizeof(bool) is 1.
But I already have a function instantiation for uint8.

The problem is that without doing "some magic" the compiler (?, or
numpy ?) would never allow to use anything but a "dedicated"
bool-typed function for bool.
Even though the CPU treats bool exactly like an integer of same byte-width.

How can I have numpy (or is SWIG the problem ??) use my existing
integer function for a bool-type array ?
(Without making a differently-typed copy of course ...)

Thanks,
Sebastian

PS: I'm not using the C++ std library.


On Nov 7, 2007 2:54 PM, Matthieu Brucher <matthieu.brucher@gmail.com> wrote:
> Hi,
>
> No, a bool is not an int32. Try just sizeof(bool) to be sure (on my box,
> it's one).
> Besides, if you use a std::vector of bool, be aware of the fact that it is
> not like the other vectors.
>
> Matthieu
>
> 2007/11/7, Sebastian Haase <haase@msg.ucsf.edu>:
> >
> >
> >
> > Hi,
> > I have a templated function written in C++.
> > My SWIG typemap instantiates this for many argument array types (such
> > as unit8, int16, uint16, int32, float32,float64,...)
> > All works well, except when feeding in a boolean array as in
> > seb.mmms(a>6)
> > I get this error:
> > NotImplementedError: No matching function for overloaded 'mmms'
> >
> > What should I do ?
> > Preferably I would avoid having to add another type-instantiation into
> > the library (it looks already quite bloated having 6+ versions of
> > every function). Isn't bool just a synonym for int32 ?
> >
> > Thanks
> > Sebastian Haase
> > _______________________________________________
> > Numpy-discussion mailing list
> > Numpy-discussion@scipy.org
> > http://projects.scipy.org/mailman/listinfo/numpy-discussion
> >
>
>
>
> --
> French PhD student
> Website : http://miles.developpez.com/
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