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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/at.hpp> | |
6 | #include <boost/hana/at_key.hpp> | |
7 | #include <boost/hana/back.hpp> | |
8 | #include <boost/hana/front.hpp> | |
9 | #include <boost/hana/integral_constant.hpp> | |
10 | #include <boost/hana/tuple.hpp> | |
11 | ||
12 | #include <utility> | |
13 | namespace hana = boost::hana; | |
14 | ||
15 | ||
16 | template <typename T> | |
17 | T const& cref(T& t) { return t; } | |
18 | ||
19 | // a non-movable, non-copyable type | |
20 | struct RefOnly { | |
21 | RefOnly() = default; | |
22 | RefOnly(RefOnly const&) = delete; | |
23 | RefOnly(RefOnly&&) = delete; | |
24 | }; | |
25 | ||
26 | template <int i> | |
27 | struct RefOnly_i : hana::int_<i> { | |
28 | RefOnly_i() = default; | |
29 | RefOnly_i(RefOnly_i const&) = delete; | |
30 | RefOnly_i(RefOnly_i&&) = delete; | |
31 | }; | |
32 | ||
33 | int main() { | |
34 | hana::tuple<RefOnly> t; | |
35 | ||
36 | // Make sure that we return the proper reference types from `at`. | |
37 | { | |
38 | RefOnly&& r1 = hana::at_c<0>(std::move(t)); | |
39 | RefOnly& r2 = hana::at_c<0>(t); | |
40 | RefOnly const& r3 = hana::at_c<0>(cref(t)); | |
41 | ||
42 | (void)r1; (void)r2; (void)r3; | |
43 | } | |
44 | ||
45 | // Make sure we return the proper reference types from `front`. | |
46 | { | |
47 | RefOnly&& r1 = hana::front(std::move(t)); | |
48 | RefOnly& r2 = hana::front(t); | |
49 | RefOnly const& r3 = hana::front(cref(t)); | |
50 | ||
51 | (void)r1; (void)r2; (void)r3; | |
52 | } | |
53 | ||
54 | // Make sure we return the proper reference types from `back`. | |
55 | { | |
56 | RefOnly&& r1 = hana::back(std::move(t)); | |
57 | RefOnly& r2 = hana::back(t); | |
58 | RefOnly const& r3 = hana::back(cref(t)); | |
59 | ||
60 | (void)r1; (void)r2; (void)r3; | |
61 | } | |
62 | ||
63 | // Make sure we return the proper reference types from `at_key`. | |
64 | { | |
65 | hana::tuple<RefOnly_i<3>> t{}; | |
66 | RefOnly_i<3>& r1 = hana::at_key(t, RefOnly_i<3>{}); | |
67 | RefOnly_i<3> const& r2 = hana::at_key(cref(t), RefOnly_i<3>{}); | |
68 | RefOnly_i<3>&& r3 = hana::at_key(std::move(t), RefOnly_i<3>{}); | |
69 | ||
70 | (void)r1; (void)r2; (void)r3; | |
71 | } | |
72 | } |