Re: %factory and templates

On Fri, 9 Oct 2020 at 16:42, <[email protected]> wrote:

> Hi
>
>
>
> We are trying to use %factory (see
> https://github.com/swig/swig/blob/master/Lib/typemaps/factory.swg) to let
> SWIG do automatic downcasting to the actual types, as opposed to just
> returning the base class. However, at present it isn’t working for us. Our
> hunch is that this is due to templates and typemaps (which I don’t
> understand well enough). We haven’t boiled it down to a simple example yet,
> but I thought maybe would know the answer straight-away 😊
>
>
>
> We have a hierarchy like this (apologies for long names, but I kept the
> ones in our actual code)
>
>
>
> stir::GeneralisedPrior<TargetT >
>
> stir::QuadraticPrior<elemT> : public
> stir::GeneralisedPrior<DiscretisedDensity<3,elemT> >
>
> stir::RelativeDifferencePrior<elemT> : public
> stir::GeneralisedPrior<DiscretisedDensity<3,elemT> >
>
>
>
> (cutting out some intermediate classes)
>
>
>
> We then have some other templated class that has a member
>
>
>
> stir::GeneralisedPrior<TargetT >
> *GeneralisedObjectiveFunction<TargetT>::get_prior_ptr()
>
>
>
> So, in our SWIG interface file we say
>
>
>
> %newobject *::get_prior_ptr;
>
> %factory(stir::GeneralisedPrior
> *stir::GeneralisedObjectiveFunction::get_prior_ptr, stir::QuadraticPrior,
> stir::PLSPrior, stir::RelativeDifferencePrior);
>
>
>
> i.e. without any template stuff at all, but it seems that the typemap
> generated by %factory isn’t picked up.
>
>
>
> Anyone any suggestions?
>
>
>
>
>
You need to instantiate your templates with %template if you aren't already.

William

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