import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / asio / test / properties / cpp03 / can_prefer_not_preferable_member_prefer.cpp

diff --git a/ceph/src/boost/libs/asio/test/properties/cpp03/can_prefer_not_preferable_member_prefer.cpp b/ceph/src/boost/libs/asio/test/properties/cpp03/can_prefer_not_preferable_member_prefer.cpp
new file mode 100644 (file)
index 0000000..a3fd637
--- /dev/null
+++ b/ceph/src/boost/libs/asio/test/properties/cpp03/can_prefer_not_preferable_member_prefer.cpp
@@ -0,0 +1,61 @@
+//
+// cpp03/can_prefer_not_preferable_member_prefer.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/prefer.hpp>
+#include <cassert>
+
+template <int>
+struct prop
+{
+  static const bool is_preferable = false;
+};
+
+template <int>
+struct object
+{
+  template <int N>
+  object<N> prefer(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 prefer_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()
+{
+  assert((!boost::asio::can_prefer<object<1>, prop<2> >::value));
+  assert((!boost::asio::can_prefer<object<1>, prop<2>, prop<3> >::value));
+  assert((!boost::asio::can_prefer<object<1>, prop<2>, prop<3>, prop<4> >::value));
+  assert((!boost::asio::can_prefer<const object<1>, prop<2> >::value));
+  assert((!boost::asio::can_prefer<const object<1>, prop<2>, prop<3> >::value));
+  assert((!boost::asio::can_prefer<const object<1>, prop<2>, prop<3>, prop<4> >::value));
+}