Index: uspace/lib/cpp/include/impl/map.hpp
===================================================================
--- uspace/lib/cpp/include/impl/map.hpp	(revision 8a7da64d4a8e4349c4073faa82f2718166d03cf1)
+++ uspace/lib/cpp/include/impl/map.hpp	(revision 255bb635746671c82fb51ef5e7cac7faf02fea9f)
@@ -294,4 +294,20 @@
             }
 
+            mapped_type& at(const key_type& key)
+            {
+                auto it = find(key);
+
+                // TODO: throw out_of_range if it == end()
+                return it->second;
+            }
+
+            const mapped_type& at(const key_type& key) const
+            {
+                auto it = find(key);
+
+                // TODO: throw out_of_range if it == end()
+                return it->second;
+            }
+
             /**
              * 23.4.4.4, modifiers: