extern XBT_PRIVATE double (*func_f_def) (lmm_variable_t, double);
extern XBT_PRIVATE double (*func_fp_def) (lmm_variable_t, double);
extern XBT_PRIVATE double (*func_f_def) (lmm_variable_t, double);
extern XBT_PRIVATE double (*func_fp_def) (lmm_variable_t, double);