Hi, I read the documentation and the header files, but I can't figure out what is the template type used in vecS, listS or setS. In my application, I need each vertex be unique and ordered so that I think about using setS. I use the bundled vertex property MyVertex to define my vertex class storage. The code perfectly compiles whereas I have not defined a comparison operator for MyVertex objects. It means that setS is not defined as setS<MyVertex>... What is the template type of setS? What is the relation between this template type and the bundled property MyVertex? Thanks a lot, Florent