+gras_datadesc_type_t
+gras_datadesc_ref_pop_arr(gras_datadesc_type_t element_type)
+{
+ int cpt = 0;
+ gras_datadesc_type_t res, ddt2;
+ char *name = (char *) xbt_malloc(strlen(element_type->name) + 4);
+
+ sprintf(name, "%s[]", element_type->name);
+ /* Make sure we are not trying to redefine a ddt with the same name */
+ ddt2 = gras_datadesc_by_name_or_null(name);
+
+ while (ddt2) {
+ free(name);
+ name = bprintf("%s[]_%d", element_type->name, cpt++);
+ ddt2 = gras_datadesc_by_name_or_null(name);
+ }
+
+ res = gras_datadesc_array_dyn(name, element_type, gras_datadesc_cb_pop);
+
+ sprintf(name, "%s[]*", element_type->name);
+ cpt = 0;
+ ddt2 = gras_datadesc_by_name_or_null(name);
+ while (ddt2) {
+ free(name);
+ name = bprintf("%s[]*_%d", element_type->name, cpt++);
+ ddt2 = gras_datadesc_by_name_or_null(name);
+ }
+
+ res = gras_datadesc_ref(name, res);
+
+ free(name);
+
+ return res;
+}
+
+/*
+ *##
+ *## Constructor of container datatypes
+ *##
+ */
+
+static void gras_datadesc_dynar_cb(gras_datadesc_type_t typedesc,
+ gras_cbps_t vars, void *data)
+{
+ gras_datadesc_type_t subtype;
+ xbt_dynar_t dynar = (xbt_dynar_t) data;
+
+ memcpy(&dynar->free_f, &typedesc->extra, sizeof(dynar->free_f));
+
+ /* search for the elemsize in what we have. If elements are "int", typedesc got is "int[]*" */
+ subtype = gras_dd_find_field(typedesc, "data")->type;
+
+ /* this is now a ref to array of what we're looking for */
+ subtype = subtype->category.ref_data.type;
+ subtype = subtype->category.array_data.type;
+
+ XBT_DEBUG("subtype is %s", subtype->name);
+
+ dynar->elmsize = subtype->size[GRAS_THISARCH];
+ dynar->size = dynar->used;
+ dynar->mutex = NULL;
+}
+
+/** \brief Declare a new type being a dynar in which each elements are of the given type
+ *
+ * The type gets registered under the name "dynar(%s)_s", where %s is the name of the subtype.
+ * For example, a dynar of doubles will be called "dynar(double)_s" and a dynar of dynar of
+ * strings will be called "dynar(dynar(string)_s)_s".
+ *
+ * \param elm_t: the datadesc of the elements
+ * \param free_func: the function to use to free the elements when the dynar gets freed
+ */
+gras_datadesc_type_t
+gras_datadesc_dynar(gras_datadesc_type_t elm_t, void_f_pvoid_t free_func)
+{
+
+ char *buffname;
+ gras_datadesc_type_t res;
+
+ buffname = bprintf("s_xbt_dynar_of_%s", elm_t->name);