update ceph source to reef 18.1.2

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

//
// cpp11/can_require_concept_not_applicable_free.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 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>();
  }
};

int main()
{
  static_assert(!boost::asio::can_require_concept<object<1>, prop<2>>::value, "");
  static_assert(!boost::asio::can_require_concept<const object<1>, prop<2>>::value, "");
}