// // cpp11/can_prefer_not_applicable_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/prefer.hpp" #include template struct prop { static constexpr bool is_preferable = true; }; template struct object { }; namespace asio { namespace traits { template struct static_require, prop > { static constexpr bool is_valid = true; }; } // namespace traits } // namespace asio int main() { static_assert(!asio::can_prefer, prop<1>>::value, ""); static_assert(!asio::can_prefer, prop<1>, prop<1>>::value, ""); static_assert(!asio::can_prefer, prop<1>, prop<1>, prop<1>>::value, ""); static_assert(!asio::can_prefer, prop<1>>::value, ""); static_assert(!asio::can_prefer, prop<1>, prop<1>>::value, ""); static_assert(!asio::can_prefer, prop<1>, prop<1>, prop<1>>::value, ""); }