1 //
2 // cpp14/can_require_unsupported.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/require.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
main()36 int main()
37 {
38 static_assert(!boost::asio::can_require_v<object<1>, prop<2>>, "");
39 static_assert(!boost::asio::can_require_v<object<1>, prop<2>, prop<3>>, "");
40 static_assert(!boost::asio::can_require_v<object<1>, prop<2>, prop<3>, prop<4>>, "");
41 static_assert(!boost::asio::can_require_v<const object<1>, prop<2>>, "");
42 static_assert(!boost::asio::can_require_v<const object<1>, prop<2>, prop<3>>, "");
43 static_assert(!boost::asio::can_require_v<const object<1>, prop<2>, prop<3>, prop<4>>, "");
44 }
45