- xbt_swag_t elem_list = NULL;
- lmm_element_t elem = NULL;
- lmm_constraint_t cnst = NULL;
- lmm_variable_t var = NULL;
+ xbt_swag_t elem_list = nullptr;
+ lmm_element_t elem = nullptr;
+ lmm_constraint_t cnst = nullptr;
+ lmm_variable_t var = nullptr;