import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / asio / test / properties / cpp14 / can_prefer_not_applicable_member_prefer.cpp

diff --git a/ceph/src/boost/libs/asio/test/properties/cpp14/can_prefer_not_applicable_member_prefer.cpp b/ceph/src/boost/libs/asio/test/properties/cpp14/can_prefer_not_applicable_member_prefer.cpp
new file mode 100644 (file)
index 0000000..2fd97fc
--- /dev/null
+++ b/ceph/src/boost/libs/asio/test/properties/cpp14/can_prefer_not_applicable_member_prefer.cpp
@@ -0,0 +1,38 @@
+//
+// cpp14/can_prefer_not_applicable_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 constexpr bool is_preferable = true;
+};
+
+template <int>
+struct object
+{
+  template <int N>
+  constexpr object<N> prefer(prop<N>) const
+  {
+    return object<N>();
+  }
+};
+
+int main()
+{
+  static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>>, "");
+  static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>>, "");
+  static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>, prop<4>>, "");
+  static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>>, "");
+  static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>>, "");
+  static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>, prop<4>>, "");
+}