// // cpp11/query_static.cpp // ~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2024 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 "asio/query.hpp" #include struct prop { }; struct object { }; namespace asio { template<> struct is_applicable_property { static constexpr bool value = true; }; namespace traits { template<> struct static_query { static constexpr bool is_valid = true; static constexpr bool is_noexcept = true; typedef int result_type; static constexpr int value() { return 123; } }; } // namespace traits } // namespace asio int main() { object o1 = {}; int result1 = asio::query(o1, prop()); assert(result1 == 123); (void)result1; const object o2 = {}; int result2 = asio::query(o2, prop()); assert(result2 == 123); (void)result2; constexpr object o3 = {}; constexpr int result3 = asio::query(o3, prop()); assert(result3 == 123); (void)result3; }