--- /dev/null
+//
+// cpp03/require_concept_member.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <boost/asio/require_concept.hpp>
+#include <cassert>
+
+template <int>
+struct prop
+{
+ static const bool is_requirable_concept = true;
+};
+
+template <int>
+struct object
+{
+ template <int N>
+ object<N> require_concept(prop<N>) const
+ {
+ return object<N>();
+ }
+};
+
+namespace boost {
+namespace asio {
+
+template<int N, int M>
+struct is_applicable_property<object<N>, prop<M> >
+{
+ static const bool value = true;
+};
+
+namespace traits {
+
+template<int N, int M>
+struct require_concept_member<object<N>, prop<M> >
+{
+ static const bool is_valid = true;
+ static const bool is_noexcept = true;
+ typedef object<M> result_type;
+};
+
+} // namespace traits
+} // namespace asio
+} // namespace boost
+
+int main()
+{
+ object<1> o1 = {};
+ object<2> o2 = boost::asio::require_concept(o1, prop<2>());
+ (void)o2;
+
+ const object<1> o3 = {};
+ object<2> o4 = boost::asio::require_concept(o3, prop<2>());
+ (void)o4;
+}