+SG_BEGIN_DECL()
+
+XBT_PUBLIC(size_t) sg_host_count();
+XBT_PUBLIC(sg_host_t *) sg_host_list(void);
+
+XBT_PUBLIC(size_t) sg_host_extension_create(void(*deleter)(void*));
+XBT_PUBLIC(void*) sg_host_extension_get(sg_host_t host, size_t rank);
+XBT_PUBLIC(sg_host_t) sg_host_by_name(const char *name);
+XBT_PUBLIC(sg_host_t) sg_host_by_name_or_create(const char *name);
+XBT_PUBLIC(const char*) sg_host_get_name(sg_host_t host);
+XBT_PUBLIC(xbt_dynar_t) sg_hosts_as_dynar(void);
+
+// ========== User Data ==============
+XBT_PUBLIC(void*) sg_host_user(sg_host_t host);
+XBT_PUBLIC(void) sg_host_user_set(sg_host_t host, void* userdata);
+XBT_PUBLIC(void) sg_host_user_destroy(sg_host_t host);
+