I'm looking at the

getDiffArea

method of

dbMterm

which in the binding returns a list of pairs. O the c++ side, the signature is that it takes as argument a reference to a vector it will fill up rather than creating the vector itself. I tried to do the same for

getGeometries

but there has to be something telling SWIG this is a return argument. And I can't find it for

getDiffAre

git grep gives be nothing beyong the definition/declaration and a couple of unrelated users. Nothing that would "guide" the swig bindings.