Index: uspace/lib/cpp/include/impl/array.hpp
===================================================================
--- uspace/lib/cpp/include/impl/array.hpp	(revision aab972fe2cab819dc92aac3f181b00407934b684)
+++ uspace/lib/cpp/include/impl/array.hpp	(revision 2d72b26cbc9d9ae5636e4ba32859eb2ec8cdbfca)
@@ -121,5 +121,15 @@
         }
 
-        // TODO: ref/cref at (with bounds checking), needs exceptions
+        reference at(size_type idx)
+        {
+            // TODO: Bounds checking.
+            return elems[idx];
+        }
+
+        constexpr const_reference at(size_type idx) const
+        {
+            // TODO: Bounds checking.
+            return elems[idx];
+        }
 
         reference front()