XBT_PUBLIC(lmm_constraint_t) lmm_constraint_new(lmm_system_t sys, void *id,
double bound_value);
void lmm_constraint_shared(lmm_constraint_t cnst);
+int lmm_constraint_is_shared(lmm_constraint_t cnst);
void lmm_constraint_free(lmm_system_t sys, lmm_constraint_t cnst);