XBT_CDEBUG(surf_lagrange_dichotomy, "Computing diff of cnst (%p)", cnst);
xbt_swag_foreach(_elem, elem_list) {
elem = (lmm_element_t)_elem;
var = elem->variable;
XBT_CDEBUG(surf_lagrange_dichotomy, "Computing diff of cnst (%p)", cnst);
xbt_swag_foreach(_elem, elem_list) {
elem = (lmm_element_t)_elem;
var = elem->variable;