ceph/src/boost/libs/asio/test/properties/cpp03/can_require_concept_free.cpp

   1 //
   2 // cpp03/can_require_concept_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_concept.hpp>
  12 #include <cassert>
  13
  14 template <int>
  15 struct prop
  16 {
  17   static const bool is_requirable_concept = true;
  18 };
  19
  20 template <int>
  21 struct object
  22 {
  23   template <int N>
  24   friend object<N> require_concept(const object&, prop<N>)
  25   {
  26     return object<N>();
  27   }
  28 };
  29
  30 namespace boost {
  31 namespace asio {
  32
  33 template<int N, int M>
  34 struct is_applicable_property<object<N>, prop<M> >
  35 {
  36   static const bool value = true;
  37 };
  38
  39 namespace traits {
  40
  41 template<int N, int M>
  42 struct require_concept_free<object<N>, prop<M> >
  43 {
  44   static const bool is_valid = true;
  45   static const bool is_noexcept = true;
  46   typedef object<M> result_type;
  47 };
  48
  49 } // namespace traits
  50 } // namespace asio
  51 } // namespace boost
  52
  53 int main()
  54 {
  55   assert((boost::asio::can_require_concept<object<1>, prop<2> >::value));
  56   assert((boost::asio::can_require_concept<const object<1>, prop<2> >::value));
  57 }