1 // 2 // cpp03/can_query_unsupported.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/query.hpp> 12 #include <cassert> 13 14 struct prop 15 { 16 }; 17 18 struct object 19 { 20 }; 21 22 namespace boost { 23 namespace asio { 24 25 template <> 26 struct is_applicable_property<object, prop> 27 { 28 static const bool value = true; 29 }; 30 31 } // namespace asio 32 } // namespace boost 33 main()34int main() 35 { 36 assert((!boost::asio::can_query<object, prop>::value)); 37 assert((!boost::asio::can_query<const object, prop>::value)); 38 } 39