-XBT_PUBLIC int sg_link_is_shared(sg_link_t link);
-XBT_PUBLIC double sg_link_bandwidth(sg_link_t link);
-XBT_PUBLIC double sg_link_latency(sg_link_t link);
-XBT_PUBLIC void* sg_link_data(sg_link_t link);
+XBT_PUBLIC int sg_link_is_shared(const_sg_link_t link);
+XBT_PUBLIC double sg_link_bandwidth(const_sg_link_t link);
+XBT_PUBLIC void sg_link_bandwidth_set(sg_link_t link, double value);
+XBT_PUBLIC double sg_link_latency(const_sg_link_t link);
+XBT_PUBLIC void sg_link_latency_set(sg_link_t link, double value);
+XBT_PUBLIC void* sg_link_data(const_sg_link_t link);