]>
Commit | Line | Data |
---|---|---|
20effc67 TL |
1 | // |
2 | // cpp14/can_prefer_member_prefer.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 | template <typename> static constexpr bool is_applicable_property_v = true; | |
18 | static constexpr bool is_preferable = true; | |
19 | }; | |
20 | ||
21 | template <int> | |
22 | struct object | |
23 | { | |
24 | template <int N> | |
25 | constexpr object<N> prefer(prop<N>) const | |
26 | { | |
27 | return object<N>(); | |
28 | } | |
29 | }; | |
30 | ||
31 | int main() | |
32 | { | |
33 | static_assert(boost::asio::can_prefer_v<object<1>, prop<2>>, ""); | |
34 | static_assert(boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>>, ""); | |
35 | static_assert(boost::asio::can_prefer_v<object<1>, prop<2>, prop<3>, prop<4>>, ""); | |
36 | static_assert(boost::asio::can_prefer_v<const object<1>, prop<2>>, ""); | |
37 | static_assert(boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>>, ""); | |
38 | static_assert(boost::asio::can_prefer_v<const object<1>, prop<2>, prop<3>, prop<4>>, ""); | |
39 | } |