1 //
2 // cpp14/can_prefer_static.cpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10
11 #include <boost/asio/prefer.hpp>
12 #include <cassert>
13
14 template <int>
15 struct prop
16 {
17 template <typename> static constexpr bool is_applicable_property_v = true;
18 static constexpr bool is_preferable = true;
19 template <typename> static constexpr bool static_query_v = true;
valueprop20 static constexpr bool value() { return true; }
21 };
22
23 template <int>
24 struct object
25 {
26 };
27
main()28 int main()
29 {
30 static_assert(boost::asio::can_prefer_v<object<1>, prop<1>>, "");
31 static_assert(boost::asio::can_prefer_v<object<1>, prop<1>, prop<1>>, "");
32 static_assert(boost::asio::can_prefer_v<object<1>, prop<1>, prop<1>, prop<1>>, "");
33 static_assert(boost::asio::can_prefer_v<const object<1>, prop<1>>, "");
34 static_assert(boost::asio::can_prefer_v<const object<1>, prop<1>, prop<1>>, "");
35 static_assert(boost::asio::can_prefer_v<const object<1>, prop<1>, prop<1>, prop<1>>, "");
36 }
37