bool aga_update_node(const struct aga_graph *g, struct aga_node *node);
bool aga_check_state(const struct aga_graph *g);
void aga_fail(struct aga_graph *g, int error);
bool aga_update_node(const struct aga_graph *g, struct aga_node *node);
bool aga_check_state(const struct aga_graph *g);
void aga_fail(struct aga_graph *g, int error);