diff options
Diffstat (limited to 'sql/sql_list.h')
| -rw-r--r-- | sql/sql_list.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sql/sql_list.h b/sql/sql_list.h index 38235a10c18..50673921aeb 100644 --- a/sql/sql_list.h +++ b/sql/sql_list.h @@ -152,6 +152,7 @@ struct list_node :public Sql_alloc } }; +typedef bool List_eq(void *a, void *b); extern MYSQL_PLUGIN_IMPORT list_node end_of_list; @@ -295,6 +296,16 @@ public: inline void **head_ref() { return first != &end_of_list ? &first->info : 0; } inline bool is_empty() { return first == &end_of_list ; } inline list_node *last_ref() { return &end_of_list; } + inline bool add_unique(void *info, List_eq *eq) + { + list_node *node= first; + for (; + node != &end_of_list && (!(*eq)(node->info, info)); + node= node->next) ; + if (node == &end_of_list) + return push_back(info); + return 1; + } friend class base_list_iterator; friend class error_list; friend class error_list_iterator; @@ -465,6 +476,8 @@ public: inline void concat(List<T> *list) { base_list::concat(list); } inline void disjoin(List<T> *list) { base_list::disjoin(list); } inline void prepand(List<T> *list) { base_list::prepand(list); } + inline bool add_unique(T *a, bool (*eq)(T *a, T *b)) + { return base_list::add_unique(a, (List_eq *)eq); } void delete_elements(void) { list_node *element,*next; |