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

   1 //
   2 // cpp03/can_prefer_static.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 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/prefer.hpp>
  12 #include <cassert>
  13
  14 template <int>
  15 struct prop
  16 {
  17   static const bool is_preferable = true;
  18 };
  19
  20 template <int>
  21 struct object
  22 {
  23 };
  24
  25 namespace boost {
  26 namespace asio {
  27
  28 template<int N, int M>
  29 struct is_applicable_property<object<N>, prop<M> >
  30 {
  31   static const bool value = true;
  32 };
  33
  34 namespace traits {
  35
  36 template<int N>
  37 struct static_require<object<N>, prop<N> >
  38 {
  39   static const bool is_valid = true;
  40 };
  41
  42 } // namespace traits
  43 } // namespace asio
  44 } // namespace boost
  45
  46 int main()
  47 {
  48   assert((boost::asio::can_prefer<object<1>, prop<1> >::value));
  49   assert((boost::asio::can_prefer<object<1>, prop<1>, prop<1> >::value));
  50   assert((boost::asio::can_prefer<object<1>, prop<1>, prop<1>, prop<1> >::value));
  51   assert((boost::asio::can_prefer<const object<1>, prop<1> >::value));
  52   assert((boost::asio::can_prefer<const object<1>, prop<1>, prop<1> >::value));
  53   assert((boost::asio::can_prefer<const object<1>, prop<1>, prop<1>, prop<1> >::value));
  54 }