Both of these function types receive a table item as their first
argument tbl_item and the tbl_param associated with the table as
their second argument. This tbl_param is the same one passed as the
third argument to tbl_comparison_func. libavl will never pass a
null pointer as tbl_item to either kind of function.
A tbl_item_func performs some kind of action on tbl_item. The
particular action that it should perform depends on the context in which
it is used and the needs of the calling program.
A tbl_copy_func creates and returns a new copy of tbl_item. If
copying fails, then it returns a null pointer.
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