diff --git a/src/hashmap/hashmap.c b/src/hashmap/hashmap.c
index 24c0b54..f688629 100644
--- a/src/hashmap/hashmap.c
+++ b/src/hashmap/hashmap.c
@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 #include "hashmap.h"
+#include <stdlib.h>
 
 
 // ! Caution with value_size if you care to store something else than pointers
@@ -353,6 +354,29 @@ int HashMap_EntryByIndex(hashmap_t* restrict hashmap, size_t index, hashmapentry
     return EXIT_SUCCESS;
 }
 
+int HashMap_ForEach(hashmap_t* hashmap, HashMapVisitFunction visitor, void* context)
+{
+	if (hashmap == NULL) {
+		return EINVAL;
+	}
+	if (visitor == NULL) {
+		return EINVAL;
+	}
+
+	for (size_t i = 0; i < hashmap->capacity; i++) {
+		hashmapentry_t* entry = hashmap->buckets[i];
+		while (entry != NULL) {
+			int visit_code = visitor(context, entry->key, entry->key_length, entry->value);
+			if (visit_code != EXIT_SUCCESS) {
+				return visit_code;
+			}
+			entry = entry->next;
+		}
+	}
+
+	return EXIT_SUCCESS;
+}
+
 size_t HashMap_Size(hashmap_t* restrict hashmap)
 {
     return hashmap->used;
diff --git a/src/hashmap/hashmap.h b/src/hashmap/hashmap.h
index c60ebdf..52e0f42 100644
--- a/src/hashmap/hashmap.h
+++ b/src/hashmap/hashmap.h
@@ -48,20 +48,23 @@ typedef struct HashMap {
 	struct HashMapConfig  config;
 } hashmap_t;
 
+typedef int (*HashMapVisitFunction) (void* context, void* key, size_t key_length, void* value);
+
 struct HashMapConfig HashMap_DefaultConfig(void);
 
-int HashMap_Create(hashmap_t*  restrict destination, struct HashMapConfig* restrict config, size_t initial_capacity);
-void HashMap_Destroy(hashmap_t* restrict hashmap);
+int HashMap_Create(hashmap_t*  destination, struct HashMapConfig* config, size_t initial_capacity);
+void HashMap_Destroy(hashmap_t* hashmap);
 
-int HashMap_Put(hashmap_t* restrict hashmap, const void* key, size_t key_length, void* value);
-int HashMap_Remove(hashmap_t* restrict hashmap, const void* restrict key, size_t key_length);
+int HashMap_Put(hashmap_t* hashmap, const void* key, size_t key_length, void* value);
+int HashMap_Remove(hashmap_t* hashmap, const void* key, size_t key_length);
 
-int HashMap_Get(hashmap_t* restrict hashmap, const void* key, size_t key_length, void* value_storage);
+int HashMap_Get(hashmap_t* hashmap, const void* key, size_t key_length, void* value_storage);
 
-int HashMap_Update(hashmap_t* restrict hashmap, const void* key, size_t key_length, void* new_value);
+int HashMap_Update(hashmap_t* hashmap, const void* key, size_t key_length, void* new_value);
 
-int HashMap_ValueByIndex(hashmap_t* restrict hashmap, size_t index, void* store_here);
-int HashMap_EntryByIndex(hashmap_t* restrict hashmap, size_t index, hashmapentry_t** store_here);
-size_t HashMap_Size(hashmap_t* restrict hashmap);
+int HashMap_ValueByIndex(hashmap_t* hashmap, size_t index, void* store_here);
+int HashMap_EntryByIndex(hashmap_t* hashmap, size_t index, hashmapentry_t** store_here);
+int HashMap_ForEach(hashmap_t* hashmap, HashMapVisitFunction visitor, void* context);
+size_t HashMap_Size(hashmap_t* hashmap);
 
 #endif /* SRC_COMMON_HASHMAP_HASHMAP_H_ */