| 1 | // |
| 2 | // cpp11/query_free.cpp |
| 3 | // ~~~~~~~~~~~~~~~~~~~~ |
| 4 | // |
| 5 | // Copyright (c) 2003-2024 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 | friend constexpr int query(const object&, prop) { return 123; } |
| 21 | }; |
| 22 | |
| 23 | namespace boost { |
| 24 | namespace asio { |
| 25 | |
| 26 | template<> |
| 27 | struct is_applicable_property<object, prop> |
| 28 | { |
| 29 | static constexpr bool value = true; |
| 30 | }; |
| 31 | |
| 32 | } // namespace asio |
| 33 | } // namespace boost |
| 34 | |
| 35 | int main() |
| 36 | { |
| 37 | object o1 = {}; |
| 38 | int result1 = boost::asio::query(o1, prop()); |
| 39 | assert(result1 == 123); |
| 40 | (void)result1; |
| 41 | |
| 42 | const object o2 = {}; |
| 43 | int result2 = boost::asio::query(o2, prop()); |
| 44 | assert(result2 == 123); |
| 45 | (void)result2; |
| 46 | |
| 47 | constexpr object o3 = {}; |
| 48 | constexpr int result3 = boost::asio::query(o3, prop()); |
| 49 | assert(result3 == 123); |
| 50 | (void)result3; |
| 51 | } |
| 52 | |