ceph/src/boost/libs/asio/test/properties/cpp11/can_require_not_applicable_free.cpp

   1 //
   2 // cpp11/can_require_not_applicable_free.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <boost/asio/require.hpp>
  12 #include <cassert>
  13
  14 template <int>
  15 struct prop
  16 {
  17   static constexpr bool is_requirable = true;
  18 };
  19
  20 template <int>
  21 struct object
  22 {
  23   template <int N>
  24   friend constexpr object<N> require(const object&, prop<N>)
  25   {
  26     return object<N>();
  27   }
  28 };
  29
  30 int main()
  31 {
  32   static_assert(!boost::asio::can_require<object<1>, prop<2>>::value, "");
  33   static_assert(!boost::asio::can_require<object<1>, prop<2>, prop<3>>::value, "");
  34   static_assert(!boost::asio::can_require<object<1>, prop<2>, prop<3>, prop<4>>::value, "");
  35   static_assert(!boost::asio::can_require<const object<1>, prop<2>>::value, "");
  36   static_assert(!boost::asio::can_require<const object<1>, prop<2>, prop<3>>::value, "");
  37   static_assert(!boost::asio::can_require<const object<1>, prop<2>, prop<3>, prop<4>>::value, "");
  38 }