[Cython] template types

[Lisandro Dalcin]

On Tue, May 5, 2009 at 4:59 PM, Dag Sverre Seljebotn
<dagss at student.matnat.uio.no> wrote:
>
> OTOH, this brings up another interesting question: What happens with
> exporting templates to Python-land?
>

SWIG supports templates and exposing templates to Python side... but
having to choose a name for the "instantiation" always bothered me...
At some point, I've started to use some hackery via a registry and a
custom class abusing of __getitem__() to support on Python side:

myinst = MyClass[sometype](args)

At first, I was tempted to use "MyClass(sometype)(args)", but almost
immediately I ruled it out  because that was too much confusing.

So, I'm +1 on "[]" for templates...

>
> (I'd say that's a valid usecase eventually, but of course not something
> to support at first.
>

Why not? IMHO, that would be easiest part to implement from the whole
beast (assuming that a registry and a companion type implementing
dispatching via __getitem__() would be enough).

> But it /does/ impact the chosen syntax quite
> heavily as <> is ruled straight out.)
>

Indeed. That's the reason I support "[]" for templates over the C++/D way.


-- 
Lisandro Dalcín
---------------
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