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diff --git a/boost/hana/detail/operators/searchable.hpp b/boost/hana/detail/operators/searchable.hpp
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+++ b/boost/hana/detail/operators/searchable.hpp
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+/*!
+@file
+Defines operators for Searchables.
+
+@copyright Louis Dionne 2013-2016
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_DETAIL_OPERATORS_SEARCHABLE_HPP
+#define BOOST_HANA_DETAIL_OPERATORS_SEARCHABLE_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/fwd/at_key.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN namespace detail {
+    template <typename Derived>
+    struct searchable_operators {
+        template <typename Key>
+        constexpr decltype(auto) operator[](Key&& key) & {
+            return hana::at_key(static_cast<Derived&>(*this),
+                                static_cast<Key&&>(key));
+        }
+
+        template <typename Key>
+        constexpr decltype(auto) operator[](Key&& key) && {
+            return hana::at_key(static_cast<Derived&&>(*this),
+                                static_cast<Key&&>(key));
+        }
+
+        template <typename Key>
+        constexpr decltype(auto) operator[](Key&& key) const& {
+            return hana::at_key(static_cast<Derived const&>(*this),
+                                static_cast<Key&&>(key));
+        }
+    };
+} BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_DETAIL_OPERATORS_SEARCHABLE_HPP