Method traverse

src/ifcparse/IfcParse.cpp:1824–1829

}

aggregate_of_instance::ptr IfcParse::traverse(IfcUtil::IfcBaseClass* instance, int max_level) {
    std::set<IfcUtil::IfcBaseClass*> visited;
    traversal_recorder recorder(0);
    traverse_(instance, visited, recorder, 0, max_level);
    return recorder.get_list();
}

// I'm cheating this isn't breadth-first, but rather we record visited instances
// keeping track of their rank and return a list ordered by rank. Is this equivalent?