feat(vector): foreach method

vector/myvector.c

@@ -222,7 +222,7 @@ int vec_insert(vec_s *vec, size_t index, void *value) {
 		void *tmp = realloc(vec->data, next_power_two(vec->size + 1));
 		if (tmp == NULL) {
 			mtx_unlock(&vec->lock);
-			
+
 			return -1;
 		}
 		vec->data = tmp;
@@ -281,3 +281,21 @@ int vec_set(vec_s *vec, size_t index, void *value) {
 
 	return 0;
 }
+
+int vec_foreach(vec_s *vec, void (*fefn)(void *)) {
+	if (vec == NULL || fefn == NULL) {
+		return -1;
+	}
+
+	if (mtx_lock(&vec->lock) != thrd_success) {
+		return -1;
+	}
+
+	for (size_t i = 0; i < vec->size; ++i) {
+		fefn((char *)vec->data + (i * vec->elem_size));
+	}
+
+	mtx_unlock(&vec->lock);
+
+	return 0;
+}