import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / asio / test / properties / cpp11 / require_concept_free.cpp

diff --git a/ceph/src/boost/libs/asio/test/properties/cpp11/require_concept_free.cpp b/ceph/src/boost/libs/asio/test/properties/cpp11/require_concept_free.cpp
new file mode 100644 (file)
index 0000000..76d8a2e
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+++ b/ceph/src/boost/libs/asio/test/properties/cpp11/require_concept_free.cpp
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+//
+// cpp11/require_concept_free.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 constexpr bool is_requirable_concept = true;
+};
+
+template <int>
+struct object
+{
+  template <int N>
+  friend constexpr object<N> require_concept(const object&, prop<N>)
+  {
+    return object<N>();
+  }
+};
+
+namespace boost {
+namespace asio {
+
+template<int N, int M>
+struct is_applicable_property<object<N>, prop<M> >
+{
+  static constexpr bool value = true;
+};
+
+} // 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;
+
+  constexpr object<2> o5 = boost::asio::require_concept(object<1>(), prop<2>());
+  (void)o5;
+}