virtual void after_split_edge (Halfedge_handle h1, Halfedge_handle h2) { std::string str = h1->data(); if (str.compare("") == 0) str = h2->data(); if (str.compare("") == 0) str = h1->twin()->data(); if (str.compare("") == 0) str = h2->twin()->data(); h1->set_data(str); h2->set_data(str); h1->twin()->set_data(str); h2->twin()->set_data(str); }