src/avltree.h
static inline int
avltree_empty(const struct avltree *tree)
{
    return tree->root == NULL;
}
/*
 * Return true if tree is empty.
 */
Return true if tree is empty.
Return true if tree is empty .
static inline int
avltree_empty(const struct avltree *tree)
{
    return tree->root == NULL;
}
static inline int avltree_empty ( const struct avltree * tree ) { return tree -> root == NULL ; }
Return true if tree is empty.
Return true if tree is empty .