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1 | // |
2 | // cpp14/prefer_static.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 | template <typename> static constexpr bool static_query_v = true; | |
20 | static constexpr bool value() { return true; } | |
21 | }; | |
22 | ||
23 | template <int> | |
24 | struct object | |
25 | { | |
26 | }; | |
27 | ||
28 | int main() | |
29 | { | |
30 | object<1> o1 = {}; | |
31 | object<1> o2 = boost::asio::prefer(o1, prop<1>()); | |
32 | object<1> o3 = boost::asio::prefer(o1, prop<1>(), prop<1>()); | |
33 | object<1> o4 = boost::asio::prefer(o1, prop<1>(), prop<1>(), prop<1>()); | |
34 | (void)o2; | |
35 | (void)o3; | |
36 | (void)o4; | |
37 | ||
38 | const object<1> o5 = {}; | |
39 | object<1> o6 = boost::asio::prefer(o5, prop<1>()); | |
40 | object<1> o7 = boost::asio::prefer(o5, prop<1>(), prop<1>()); | |
41 | object<1> o8 = boost::asio::prefer(o5, prop<1>(), prop<1>(), prop<1>()); | |
42 | (void)o6; | |
43 | (void)o7; | |
44 | (void)o8; | |
45 | ||
46 | constexpr object<1> o9 = boost::asio::prefer(object<1>(), prop<1>()); | |
47 | constexpr object<1> o10 = boost::asio::prefer(object<1>(), prop<1>(), prop<1>()); | |
48 | constexpr object<1> o11 = boost::asio::prefer(object<1>(), prop<1>(), prop<1>(), prop<1>()); | |
49 | (void)o9; | |
50 | (void)o10; | |
51 | (void)o11; | |
52 | } |