diff --git a/adapter.hpp b/adapter.hpp
index 7bffa874..a585e222 100644
--- a/adapter.hpp
+++ b/adapter.hpp
@@ -3,7 +3,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  *
- * Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2015-2019 Danny Robson <danny@nerdcruft.net>
  */
 
 #include <array>
@@ -13,6 +13,31 @@
 
 namespace cruft::adapter {
     namespace container {
+        /// An identity proxy for a referenced container.
+        ///
+        /// Provided for symmetry with `reverse` and others, so as to allow a
+        /// common template interface.
+        template <typename ContainerT>
+        class identity {
+        public:
+            identity (ContainerT &_target)
+                : m_target (_target)
+            { ; }
+
+            decltype(auto) begin (void) & { return m_target.begin (); }
+            decltype(auto) end   (void) & { return m_target.end (); }
+
+            decltype(auto) begin (void) const& { return m_target.begin (); }
+            decltype(auto) end   (void) const& { return m_target.end (); }
+
+            decltype(auto) cbegin (void) const& { return m_target.cbegin (); }
+            decltype(auto) cend   (void) const& { return m_target.cend (); }
+
+        private:
+            ContainerT &m_target;
+        };
+
+
         /// Creates a reversed proxy for a referenced container.
         ///
         /// The target container must remain an l-value.