import quincy beta 17.1.0

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

diff --git a/ceph/src/boost/libs/asio/test/properties/cpp14/prefer_free_require.cpp b/ceph/src/boost/libs/asio/test/properties/cpp14/prefer_free_require.cpp
new file mode 100644 (file)
index 0000000..19001c5
--- /dev/null
+++ b/ceph/src/boost/libs/asio/test/properties/cpp14/prefer_free_require.cpp
@@ -0,0 +1,55 @@
+//
+// cpp14/prefer_free_require.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
+{
+  template <typename> static constexpr bool is_applicable_property_v = true;
+  static constexpr bool is_preferable = true;
+};
+
+template <int>
+struct object
+{
+  template <int N>
+  friend constexpr object<N> require(const object&, prop<N>)
+  {
+    return object<N>();
+  }
+};
+
+int main()
+{
+  object<1> o1 = {};
+  object<2> o2 = boost::asio::prefer(o1, prop<2>());
+  object<3> o3 = boost::asio::prefer(o1, prop<2>(), prop<3>());
+  object<4> o4 = boost::asio::prefer(o1, prop<2>(), prop<3>(), prop<4>());
+  (void)o2;
+  (void)o3;
+  (void)o4;
+
+  const object<1> o5 = {};
+  object<2> o6 = boost::asio::prefer(o5, prop<2>());
+  object<3> o7 = boost::asio::prefer(o5, prop<2>(), prop<3>());
+  object<4> o8 = boost::asio::prefer(o5, prop<2>(), prop<3>(), prop<4>());
+  (void)o6;
+  (void)o7;
+  (void)o8;
+
+  constexpr object<2> o9 = boost::asio::prefer(object<1>(), prop<2>());
+  constexpr object<3> o10 = boost::asio::prefer(object<1>(), prop<2>(), prop<3>());
+  constexpr object<4> o11 = boost::asio::prefer(object<1>(), prop<2>(), prop<3>(), prop<4>());
+  (void)o9;
+  (void)o10;
+  (void)o11;
+}