void *btr_context(struct btr_node *btrn);
void btr_merge(struct btr_node *btrn, size_t dest_size);
void btr_log_tree(struct btr_node *btrn, int loglevel);
void *btr_context(struct btr_node *btrn);
void btr_merge(struct btr_node *btrn, size_t dest_size);
void btr_log_tree(struct btr_node *btrn, int loglevel);