Hi, Below code gives a compile error in MSVC2010. Any ideas whats the issue? #include <boost/polygon/polygon.hpp> namespace gtl = boost::polygon; using namespace gtl; using namespace boost::polygon::operators; using namespace std; typedef gtl::polygon_set_data<double> CPolygonSet; static void test_boost_polygons() { CPolygonSet polyset1, polyset2, rset; rset = polyset1 + polyset2; } void main() { test_boost_polygons(); } Error: ===== \boost\polygon\polygon_45_set_data.hpp(1458): error C2825: 'iT': must be a class or namespace when followed by '::' 1>\boost\polygon\polygon_45_set_data.hpp(1524) : see reference to function template instantiation 'void boost::polygon::get_error_rects_shell<cT,const boost::polygon::point_data<T>*>(cT &,cT &,iT,iT)' being compiled 1>with 1>[ 1> cT=stlp_std::vector<boost::polygon::rectangle_data<Unit2>>, 1> T=double, 1> iT=const boost::polygon::point_data<double> * 1>] 1>\boost\polygon\polygon_45_set_data.hpp(1621) : see reference to function template instantiation 'void boost::polygon::get_error_rects<stlp_std::vector<_Tp>,boost::polygon::polygon_45_with_holes_data<T>>(cT &,cT &,const pT &)' being compiled 1>with 1>[ 1> _Tp=boost::polygon::rectangle_data<Unit2>, 1> T=double, 1> cT=stlp_std::vector<boost::polygon::rectangle_data<Unit2>>, 1> pT=boost::polygon::polygon_45_with_holes_data<double> 1>] 1>\boost\polygon\detail/polygon_set_view.hpp(102) : see reference to function template instantiation 'void boost::polygon::polygon_45_set_data<Unit>::applyAdaptiveBoolean_<0>(boost::polygon::polygon_45_set_data<Unit> &,const boost::polygon::polygon_45_set_data<Unit> &) const' being compiled 1>with 1>[ 1> Unit=double 1>]