// // cpp14/query_static.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 #include struct prop { template static constexpr bool is_applicable_property_v = true; template static constexpr int static_query_v = 123; }; struct object { }; 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; }