diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/my_tree.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/my_tree.h b/include/my_tree.h index ca207932c73..3aeef20e0ad 100644 --- a/include/my_tree.h +++ b/include/my_tree.h @@ -30,6 +30,15 @@ extern "C" { #define tree_set_pointer(element,ptr) *((uchar **) (element+1))=((uchar*) (ptr)) +/* + A tree with its flag set to TREE_ONLY_DUPS behaves differently on inserting + an element that is not in the tree: + the element is not added at all, but instead tree_insert() returns a special + address TREE_ELEMENT_UNIQUE as an indication that the function has not failed + due to lack of memory. +*/ + +#define TREE_ELEMENT_UNIQUE ((TREE_ELEMENT *) 1) #define TREE_NO_DUPS 1 #define TREE_ONLY_DUPS 2 |