void *tfind(void *key, void **rootp, int(*compar) (const void *, const void *));
All comparisons are done with a user-supplied routine, compar. This routine is called with two arguments, the pointers to the elements being compared. It returns an integer less than, equal to, or greater than 0, according to whether the first argument is to be considered less than, equal to, or greater than the second argument. The comparison function need not compare every byte, so arbitrary data may be contained in the elements in addition to the values being compared.
If the calling function alters rootp, results are unpredictable.
Points to the node to find.
Points to a pointer to the root of the tree. A null value for the variable pointed to by rootp denotes an empty tree.
Is the comparator function.
PTC MKS Toolkit for Professional Developers
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PTC MKS Toolkit 10.3 Documentation Build 39.