[Numpy-discussion] Numpy complex types, packing and C99

Charles R Harris charlesr.harris@gmail....
Wed Jul 1 14:30:22 CDT 2009


On Wed, Jul 1, 2009 at 1:59 AM, David Cournapeau <
david@ar.media.kyoto-u.ac.jp> wrote:

> Hi,
>
>    I would like to add an explicit configuration test to check that our
> complex type is compatible with the C99 complex type (when available).
> Is this ok ?
>
>    As currently defined, complex c types (npy_cfloat, etc...) are not
> defined in a way such as they are binary compatible with the C99 complex
> type. Strictly speaking, packing the complex type is an ABI break, but
> we already make the assumption in ufunc, so we would have wrong
> results/crashes currently if it were not packed, so I believe the check
> is harmless by itself. The rationale is that I would like to add support
> for complex math in npy_math (cabs, cexp, etc...). As I would like to
> use the C99 complex type (when available), this requires that numpy
> complex type is ABI compatible with C99 type.
>

What do you mean by "packing" ?

Chuck
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