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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/assert.hpp> | |
6 | #include <boost/hana/first.hpp> | |
7 | #include <boost/hana/pair.hpp> | |
8 | #include <boost/hana/second.hpp> | |
9 | ||
10 | #include <type_traits> | |
11 | #include <utility> | |
12 | namespace hana = boost::hana; | |
13 | ||
14 | ||
15 | struct MoveOnly { | |
16 | int data_; | |
17 | MoveOnly(MoveOnly const&) = delete; | |
18 | MoveOnly& operator=(MoveOnly const&) = delete; | |
19 | MoveOnly(int data) : data_(data) { } | |
20 | MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; } | |
21 | ||
22 | MoveOnly& operator=(MoveOnly&& x) | |
23 | { data_ = x.data_; x.data_ = 0; return *this; } | |
24 | ||
25 | bool operator==(const MoveOnly& x) const { return data_ == x.data_; } | |
26 | }; | |
27 | ||
28 | struct MoveOnlyDerived : MoveOnly { | |
29 | MoveOnlyDerived(MoveOnlyDerived&&) = default; | |
30 | MoveOnlyDerived(int data = 1) : MoveOnly(data) { } | |
31 | }; | |
32 | ||
33 | template <typename Target> | |
34 | struct implicit_to { | |
35 | constexpr operator Target() const { return Target{}; } | |
36 | }; | |
37 | ||
38 | struct NoMove { | |
39 | NoMove() = default; | |
40 | NoMove(NoMove const&) = delete; | |
41 | NoMove(NoMove&&) = delete; | |
42 | }; | |
43 | ||
44 | // Note: It is also useful to check with a non-empty class, because that | |
45 | // triggers different instantiations due to EBO. | |
46 | struct NoMove_nonempty { | |
47 | NoMove_nonempty() = default; | |
48 | NoMove_nonempty(NoMove_nonempty const&) = delete; | |
49 | NoMove_nonempty(NoMove_nonempty&&) = delete; | |
50 | int i; | |
51 | }; | |
52 | ||
53 | int main() { | |
54 | { | |
55 | hana::pair<MoveOnly, short> p1(MoveOnly{3}, 4); | |
56 | hana::pair<MoveOnly, short> p2(std::move(p1)); | |
57 | BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3}); | |
58 | BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4); | |
59 | } | |
60 | ||
61 | // Make sure it works across pair types | |
62 | { | |
63 | hana::pair<MoveOnlyDerived, short> p1(MoveOnlyDerived{3}, 4); | |
64 | hana::pair<MoveOnly, long> p2 = std::move(p1); | |
65 | BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3}); | |
66 | BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4); | |
67 | } | |
68 | { | |
69 | struct target1 { | |
70 | target1() = default; | |
71 | target1(target1 const&) = delete; | |
72 | target1(target1&&) = default; | |
73 | }; | |
74 | ||
75 | struct target2 { | |
76 | target2() = default; | |
77 | target2(target2 const&) = delete; | |
78 | target2(target2&&) = default; | |
79 | }; | |
80 | using Target = hana::pair<target1, target2>; | |
81 | Target p1(hana::make_pair(target1{}, target2{})); (void)p1; | |
82 | Target p2(hana::make_pair(implicit_to<target1>{}, target2{})); | |
83 | Target p3(hana::make_pair(target1{}, implicit_to<target2>{})); | |
84 | Target p4(hana::make_pair(implicit_to<target1>{}, implicit_to<target2>{})); | |
85 | } | |
86 | ||
87 | // Make sure we don't define the move constructor when it shouldn't be defined. | |
88 | { | |
89 | using Pair1 = hana::pair<NoMove, NoMove>; | |
90 | Pair1 pair1; | |
91 | static_assert(!std::is_move_constructible<Pair1>::value, ""); | |
92 | ||
93 | using Pair2 = hana::pair<NoMove_nonempty, NoMove_nonempty>; | |
94 | Pair2 pair2; | |
95 | static_assert(!std::is_move_constructible<Pair2>::value, ""); | |
96 | } | |
97 | } |