Test case for the C++11 form of the Overloaded functor helper: two
concrete type parameters with explicit using-declarations to merge their
operator() overloads.
%rename(call) maps operator() to a valid identifier so SWIG can wrap it.
%template instantiates Overloaded<IntCase,DoubleCase>: SWIG substitutes
I->IntCase, D->DoubleCase, the using-declarations resolve to known methods,
and the proxy class gets an overloaded call(int)/call(double) pair.
Assisted-by: Claude Code (claude-sonnet-4-6)
William S Fulton