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b32b8144 | 1 | // Copyright Louis Dionne 2013-2017 |
7c673cae FG |
2 | // Distributed under the Boost Software License, Version 1.0. |
3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
4 | ||
5 | #include <boost/hana/first.hpp> | |
6 | #include <boost/hana/pair.hpp> | |
7 | #include <boost/hana/second.hpp> | |
8 | ||
9 | #include <utility> | |
10 | namespace hana = boost::hana; | |
11 | ||
12 | ||
13 | template <typename T> | |
14 | T const& cref(T& t) { return t; } | |
15 | ||
16 | // a non-movable, non-copyable type | |
17 | struct RefOnly { | |
18 | RefOnly() = default; | |
19 | RefOnly(RefOnly const&) = delete; | |
20 | RefOnly(RefOnly&&) = delete; | |
21 | }; | |
22 | ||
23 | int main() { | |
24 | // This test makes sure that we return the proper reference types from | |
25 | // `first` and `second`. | |
26 | hana::pair<RefOnly, RefOnly> p; | |
27 | ||
28 | { | |
29 | RefOnly&& r1 = hana::first(std::move(p)); | |
30 | RefOnly& r2 = hana::first(p); | |
31 | RefOnly const& r3 = hana::first(cref(p)); | |
32 | ||
33 | (void)r1; (void)r2; (void)r3; | |
34 | } | |
35 | ||
36 | { | |
37 | RefOnly&& r1 = hana::second(std::move(p)); | |
38 | RefOnly& r2 = hana::second(p); | |
39 | RefOnly const& r3 = hana::second(cref(p)); | |
40 | ||
41 | (void)r1; (void)r2; (void)r3; | |
42 | } | |
43 | } |