| // |
| // cpp14/query_free.cpp |
| // ~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 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/query.hpp> |
| #include <cassert> |
| |
| struct prop |
| { |
| template <typename> static constexpr bool is_applicable_property_v = true; |
| }; |
| |
| struct object |
| { |
| friend constexpr int query(const object&, prop) { return 123; } |
| }; |
| |
| int main() |
| { |
| object o1 = {}; |
| int result1 = boost::asio::query(o1, prop()); |
| assert(result1 == 123); |
| (void)result1; |
| |
| const object o2 = {}; |
| int result2 = boost::asio::query(o2, prop()); |
| assert(result2 == 123); |
| (void)result2; |
| |
| constexpr object o3 = {}; |
| constexpr int result3 = boost::asio::query(o3, prop()); |
| assert(result3 == 123); |
| (void)result3; |
| } |