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1 | // |
2 | // cpp11/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 | static constexpr bool is_preferable = true; | |
18 | }; | |
19 | ||
20 | template <int> | |
21 | struct object | |
22 | { | |
23 | template <int N> | |
24 | constexpr object<N> prefer(prop<N>) const | |
25 | { | |
26 | return object<N>(); | |
27 | } | |
28 | }; | |
29 | ||
30 | namespace boost { | |
31 | namespace asio { | |
32 | ||
33 | template<int N, int M> | |
34 | struct is_applicable_property<object<N>, prop<M> > | |
35 | { | |
36 | static constexpr bool value = true; | |
37 | }; | |
38 | ||
39 | } // namespace asio | |
40 | } // namespace boost | |
41 | ||
42 | int main() | |
43 | { | |
44 | static_assert(boost::asio::can_prefer<object<1>, prop<2>>::value, ""); | |
45 | static_assert(boost::asio::can_prefer<object<1>, prop<2>, prop<3>>::value, ""); | |
46 | static_assert(boost::asio::can_prefer<object<1>, prop<2>, prop<3>, prop<4>>::value, ""); | |
47 | static_assert(boost::asio::can_prefer<const object<1>, prop<2>>::value, ""); | |
48 | static_assert(boost::asio::can_prefer<const object<1>, prop<2>, prop<3>>::value, ""); | |
49 | static_assert(boost::asio::can_prefer<const object<1>, prop<2>, prop<3>, prop<4>>::value, ""); | |
50 | } |