| // |
| // cpp14/require_concept_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 <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 <typename> static constexpr bool static_query_v = true; |
| static constexpr bool value() { return true; } |
| }; |
| |
| template <int> |
| struct object |
| { |
| }; |
| |
| int main() |
| { |
| object<1> o1 = {}; |
| const object<1>& o2 = boost::asio::require_concept(o1, prop<1>()); |
| assert(&o1 == &o2); |
| (void)o2; |
| |
| const object<1> o3 = {}; |
| const object<1>& o4 = boost::asio::require_concept(o3, prop<1>()); |
| assert(&o3 == &o4); |
| (void)o4; |
| |
| constexpr object<1> o5 = boost::asio::require_concept(object<1>(), prop<1>()); |
| (void)o5; |
| } |