+// ========== SURF CPU ============
+DEFINE_EXTERNAL_CLASS(Cpu);
+typedef Cpu *surf_cpu_t;
+XBT_PUBLIC(surf_cpu_t) sg_host_surfcpu(sg_host_t host);
+XBT_PUBLIC(void) sg_host_surfcpu_set(sg_host_t host, surf_cpu_t cpu);
+XBT_PUBLIC(void) sg_host_surfcpu_destroy(sg_host_t host);
+
+// ========== RoutingEdge ============
+DEFINE_EXTERNAL_CLASS(RoutingEdge);
+XBT_PUBLIC(RoutingEdge*) sg_host_edge(sg_host_t host);
+XBT_PUBLIC(void) sg_host_edge_set(sg_host_t host, RoutingEdge* edge);
+XBT_PUBLIC(void) sg_host_edge_destroy(sg_host_t host, int do_callback);
+
+
+// Module initializer. Won't survive the conversion to C++. Hopefully.