Hello all, I'm using a custom polygon set (PolygonCollection) according to the guidelines here: http://www.boost.org/doc/libs/1_47_0/libs/polygon/doc/gtl_custom_polygon_set... There is one case that I don't get any compiler error: PolygonCollection p1, p2; p1 & p2; There is this case that I do have an error: PolygonCollection p1, p2; PolygonCollection p3 = p1 & p2; The error is: error: conversion from 'boost::polygon::polygon_set_view<PolygonCollection, PolygonCollection, 1>' to non-scalar type 'PolygonCollection' requested There is also this case that I have a compiler error: PolygonCollection p1,p2,p3; p3 = p1 & p2; The error is:error: no match for 'operator=' in 'p3 = boost::polygon::operators::operator&(const geometry_type_1&, const geometry_type_2&) [with geometry_type_1 = PolygonCollection, geometry_type_2 = PolygonCollection](((const PolygonCollection&)((const PolygonCollection*)(& p1))))' /xxx/Polygon.hpp:182: note: candidates are: PolygonCollection& PolygonCollection::operator=(const PolygonCollection&) (You can notice that I have overloaded the operator= for my custom polygon set but I got the same error without the suggestion before my implementation) Any ideas are welcomed! Dimitris