| // |
| // cpp03/query_member.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 |
| { |
| }; |
| |
| struct object |
| { |
| int query(prop) const { return 123; } |
| }; |
| |
| namespace boost { |
| namespace asio { |
| |
| template<> |
| struct is_applicable_property<object, prop> |
| { |
| static const bool value = true; |
| }; |
| |
| namespace traits { |
| |
| template<> |
| struct query_member<object, prop> |
| { |
| static const bool is_valid = true; |
| static const bool is_noexcept = true; |
| typedef int result_type; |
| }; |
| |
| } // namespace traits |
| } // namespace asio |
| } // namespace boost |
| |
| 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; |
| } |