| // |
| // cpp14/can_require_concept_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/require_concept.hpp> |
| #include <cassert> |
| |
| template <int> |
| struct prop |
| { |
| template <typename> static constexpr bool is_applicable_property_v = true; |
| static constexpr bool is_requirable_concept = true; |
| }; |
| |
| template <int> |
| struct object |
| { |
| template <int N> |
| friend constexpr object<N> require_concept(const object&, prop<N>) |
| { |
| return object<N>(); |
| } |
| }; |
| |
| int main() |
| { |
| static_assert(boost::asio::can_require_concept_v<object<1>, prop<2>>, ""); |
| static_assert(boost::asio::can_require_concept_v<const object<1>, prop<2>>, ""); |
| } |