[Swig-user] Templated return types using %extend

[Ivor C. <Ivo...@pb...>]

Hi all,

I am using Swig to wrap C++ classes in python.
I have a templated class declared as

template<class Type, template<class> PatchField, class GeoMesh>
class GeometricField
{
	...
}


I would like to extend the class with a function returning
PatchField<Type>, along the lines of

template<class Type, template<class> PatchField, class GeoMesh>
class GeometricField
{
	...
	%extend
	{
		PatchField<Type>& boundaryField(...)
		{
			...
		}
	}
}

%template(volScalarField) GeometricField<scalar, fvPatchField, volMesh);


Swig accepts this but the C++ code generated for volScalarField doesn't
contain the correct expansion of the types. I expect the return type to
be fvPatchField<scalar> but instead the code contains PatchField<scalar>
(i.e. the first template class isn't expanded).

I have tried numerous typedefs and other tricks to get around this but
Swig seems to forget that PatchField is a template parameter when I put
<Type> behind it and the resulting C++ code is incorrect.
Is this a bug? Is there a workaround to this problem?

Thanks in advance!

Ivor


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