python - What's causing this SWIG syntax error? -

error message:

error: syntax error in input(1) 

my swig file:

%module interfaces  %{ #include <vector> #include <list> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/linestring.hpp> typedef boost::geometry::model::d2::point_xy<double> point; typedef boost::geometry::model::polygon<point, true, false> polygon; %}  %include "std_vector.i" %template(multipolygon) std::vector<polygon>; %template(pgon) polygon; 

if comment out last line, compiles

// %template(pgon) polygon; 

i've been re-reading swig section on templates , can't understand @ what's wrong. doing wrong , how fix it?

even though polygon typedef or alias specialization still need use %template actual template care about, e.g.:

%template(pgon) polygon<point, true, false>; 

you'll need show swig enough of definition/declaration of types involved figure out what's going on , use right types.

thus smallest complete interface file behaves how want is:

%module poly  %{ #include <vector> #include <list> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/linestring.hpp> %}  %inline %{ typedef boost::geometry::model::d2::point_xy<double> point; typedef boost::geometry::model::polygon<point, true, false> polygon; %}  namespace boost { namespace geometry { namespace model { template<typename p, bool cw, bool cl> struct polygon {}; namespace d2 { template <typename t> struct point_xy {}; } } } }  %include "std_vector.i" %template(point) boost::geometry::model::d2::point_xy<double>; %template(pgon) boost::geometry::model::polygon<point, true, false>; %template(multipolygon) std::vector<polygon>; 

this because swig needs know definition of every type wraps %template directive. need make typedefs write visible both swig , c++ compiler, did %inline avoid repeating them.