On 05/03/2011 03:51 PM, Stefan Behnel wrote:
mark florisson, 03.05.2011 15:17:
if you have
cdef func(floating x, floating y):
...
you get a "float, float" version, and a "double, double" version, but
not "float, double" or "double, float".
So, what would you have to do in order to get a "float, double" and
"double, float" version then? Could you get that with
ctypedef fused_type(double, float) floating_df
ctypedef fused_type(float, double) floating_fd
cdef func(floating_df x, floating_fd y):
?
Well, if you do something like
ctypedef fused_type(float, double) speed_t
ctypedef fused_type(float, double) acceleration_t
cdef func(speed_t x, acceleration_t y)
then you get 4 specializations. Each new typedef gives a new polymorphic
type.
OTOH, with
ctypedef speed_t acceleration_t
I guess only 2 specializations.
Treating the typedefs in this way is slightly fishy of course. It may
hint that "ctypedef" is the wrong way to declare a fused type *shrug*.
To only get the "cross-versions" you'd need something like what you
wrote + Pauli's "paired"-suggestion.
Dag Sverre
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