[Cython] template types

[Stefan Behnel]

Dag Sverre Seljebotn wrote:
> OTOH, this brings up another interesting question: What happens with 
> exporting templates to Python-land?
> 
> If there was indeed something very like typedef, but which also made the 
> templated type available Python-side...
> 
> I guess
> 
> IntVector = Vector<int>
> 
> would currently achieve that without any further magic though.

Sure.


> With [] or () or somesuch one could export some wrapper type for 
> "Vector" and look up the Vector[cython.int] type from Python-space, 
> however one must know compile-time which templates to instantiate for 
> Python access anyway. The template types to always instantiate and 
> export to Python could perhaps be embedded in the template declaration 
> syntax.

Why? If you want to provide a type to Python space, you can just
instantiate it somewhere in your program, e.g. by adding it to a name->type
mapping. No magic whatsoever involved.


> (I'd say that's a valid usecase eventually, but of course not something 
> to support at first. But it /does/ impact the chosen syntax quite 
> heavily as <> is ruled straight out.)

The syntax would be Cython-only, no need to move it into Python.

Stefan