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1 | // Copyright Louis Dionne 2013-2017 | |
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/ext/std/pair.hpp> | |
6 | #include <boost/hana/first.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 | template <int i> | |
18 | struct RefOnly { | |
19 | RefOnly() = default; | |
20 | RefOnly(RefOnly const&) = delete; | |
21 | RefOnly(RefOnly&&) = delete; | |
22 | }; | |
23 | ||
24 | int main() { | |
25 | // This test makes sure that we return the proper reference types from | |
26 | // `first` and `second`. | |
27 | std::pair<RefOnly<0>, RefOnly<1>> p; | |
28 | ||
29 | { | |
30 | RefOnly<0>&& r1 = hana::first(std::move(p)); | |
31 | RefOnly<0>& r2 = hana::first(p); | |
32 | RefOnly<0> const& r3 = hana::first(cref(p)); | |
33 | ||
34 | (void)r1; (void)r2; (void)r3; | |
35 | } | |
36 | ||
37 | { | |
38 | RefOnly<1>&& r1 = hana::second(std::move(p)); | |
39 | RefOnly<1>& r2 = hana::second(p); | |
40 | RefOnly<1> const& r3 = hana::second(cref(p)); | |
41 | ||
42 | (void)r1; (void)r2; (void)r3; | |
43 | } | |
44 | } |