1 files changed, 54 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/concept/struct/minimal_struct.hpp b/src/boost/libs/hana/test/concept/struct/minimal_struct.hpp
new file mode 100644
index 000000000..4eea80dfb
--- /dev/null
+++ b/src/boost/libs/hana/test/concept/struct/minimal_struct.hpp
@@ -0,0 +1,54 @@
+// Copyright Louis Dionne 2013-2017
+// 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_TEST_STRUCT_MINIMAL_STRUCT_HPP
+#define BOOST_HANA_TEST_STRUCT_MINIMAL_STRUCT_HPP
+
+#include <boost/hana/at.hpp>
+#include <boost/hana/fwd/accessors.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/range.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/unpack.hpp>
+
+
+template <int N>
+struct minimal_struct_tag;
+
+template <typename ...Members>
+struct minimal_struct_t {
+    boost::hana::tuple<Members...> members;
+    using hana_tag = minimal_struct_tag<sizeof...(Members)>;
+};
+
+struct obj_t {
+    template <typename ...Members>
+    constexpr minimal_struct_t<Members...> operator()(Members ...members) const {
+        return {{static_cast<Members&&>(members)...}};
+    }
+};
+constexpr obj_t obj{};
+
+namespace boost { namespace hana {
+    template <int N>
+    struct accessors_impl<minimal_struct_tag<N>> {
+        template <typename K>
+        struct get_member {
+            template <typename Struct>
+            constexpr decltype(auto) operator()(Struct&& s) const {
+                return hana::at_c<K::value>(static_cast<Struct&&>(s).members);
+            }
+        };
+
+        static auto apply() {
+            return hana::unpack(hana::range_c<int, 0, N>, [](auto ...k) {
+                return hana::make_tuple(
+                    hana::make_pair(k, get_member<decltype(k)>{})...
+                );
+            });
+        }
+    };
+}}
+
+#endif // !BOOST_HANA_TEST_STRUCT_MINIMAL_STRUCT_HPP