1 files changed, 11 insertions, 0 deletions
diff --git a/array.c b/array.c
index 3d53bc8ef7..cb37a2ead7 100644
--- a/array.c
+++ b/array.c
@@ -386,6 +386,17 @@ rb_ary_free(VALUE ary)
     }
 }
 
+size_t
+rb_ary_memsize(VALUE ary)
+{
+    if (ARY_OWNS_HEAP_P(ary)) {
+	return RARRAY(ary)->as.heap.aux.capa * sizeof(VALUE);
+    }
+    else {
+	return 0;
+    }
+}
+
 static inline void
 ary_discard(VALUE ary)
 {