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1 | // |
2 | // cpp14/can_prefer_unsupported.cpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2020 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 | }; | |
18 | ||
19 | template <int> | |
20 | struct object | |
21 | { | |
22 | }; | |
23 | ||
24 | namespace boost { | |
25 | namespace asio { | |
26 | ||
27 | template<int N, int M> | |
28 | struct is_applicable_property<object<N>, prop<M> > | |
29 | { | |
30 | static constexpr bool value = true; | |
31 | }; | |
32 | ||
33 | } // namespace asio | |
34 | } // namespace boost | |
35 | ||
36 | int main() | |
37 | { | |
38 | static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>>, ""); | |
39 | static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>>, ""); | |
40 | static_assert(!boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>, prop<4>>, ""); | |
41 | static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>>, ""); | |
42 | static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>>, ""); | |
43 | static_assert(!boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>, prop<4>>, ""); | |
44 | } |