Mercurial > hg > ucx / file diff

--- a/src/cx/map.h	Sat Nov 01 19:31:48 2025 +0100
+++ b/src/cx/map.h	Sat Nov 01 19:48:50 2025 +0100
@@ -545,6 +545,44 @@
 CX_EXPORT int cxMapListDifference(CxMap *dst, const CxMap *src, const CxList *keys,
         cx_clone_func clone_func, const CxAllocator *clone_allocator, void *data);
 
+
+/**
+ * Clones entries of a map only if their key is present in another map.
+ *
+ * @param dst the destination map
+ * @param src the map to clone the entries from
+ * @param other the map to check for existence of the keys
+ * @param clone_func the clone function for the values
+ * @param clone_allocator the allocator that is passed to the clone function
+ * @param data optional additional data that is passed to the clone function
+ * @retval zero when the elements were successfully cloned
+ * @retval non-zero when an allocation error occurred
+ */
+cx_attr_nonnull_arg(1, 2, 3, 4)
+CX_EXPORT int cxMapIntersection(CxMap *dst, const CxMap *src, const CxMap *other,
+        cx_clone_func clone_func, const CxAllocator *clone_allocator, void *data);
+
+/**
+ * Clones entries of a map only if their key is present in a list.
+ *
+ * Note that the list must contain keys of type @c CxKey
+ * (or pointers to such keys) and must use @c cx_hash_key_cmp
+ * as the compare function.
+ * Generic key types cannot be processed in this case.
+ *
+ * @param dst the destination map
+ * @param src the source map
+ * @param keys the list of @c CxKey items
+ * @param clone_func the clone function for the values
+ * @param clone_allocator the allocator that is passed to the clone function
+ * @param data optional additional data that is passed to the clone function
+ * @retval zero when the elements were successfully cloned
+ * @retval non-zero when an allocation error occurred
+ */
+cx_attr_nonnull_arg(1, 2, 3, 4)
+CX_EXPORT int cxMapListIntersection(CxMap *dst, const CxMap *src, const CxList *keys,
+        cx_clone_func clone_func, const CxAllocator *clone_allocator, void *data);
+
 #ifdef    __cplusplus
 } // extern "C"
 #endif