array: mark array_length argument as const

1 files changed, 1 insertions, 1 deletions

diff --git a/array.h b/array.h
index d55af28..fa26a4e 100644
--- a/array.h
+++ b/array.h
@@ -91,7 +91,7 @@ bool array_add_ptr(Array*, void *item);
  */
 bool array_remove(Array*, size_t idx);
 /** Number of elements currently stored in the array. */
-size_t array_length(Array*);
+size_t array_length(const Array*);
 /** Number of elements which can be stored without enlarging the array. */
 size_t array_capacity(Array*);
 /** Remove all elements with index greater or equal to ``length``, keep allocated memory. */