-XBT_PUBLIC const char* sg_actor_get_name(sg_actor_t actor);
-XBT_PUBLIC sg_host_t sg_actor_get_host(sg_actor_t actor);
-XBT_PUBLIC const char* sg_actor_get_property_value(sg_actor_t actor, const char* name);
-XBT_PUBLIC xbt_dict_t sg_actor_get_properties(sg_actor_t actor);
+XBT_PUBLIC const char* sg_actor_get_name(const_sg_actor_t actor);
+XBT_PUBLIC sg_host_t sg_actor_get_host(const_sg_actor_t actor);
+XBT_PUBLIC const char* sg_actor_get_property_value(const_sg_actor_t actor, const char* name);
+XBT_PUBLIC xbt_dict_t sg_actor_get_properties(const_sg_actor_t actor);