1// Copyright Louis Dionne 2013-2022
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/bool.hpp>
7#include <boost/hana/equal.hpp>
8#include <boost/hana/fwd/hash.hpp>
9#include <boost/hana/map.hpp>
10#include <boost/hana/pair.hpp>
11#include <boost/hana/type.hpp>
12
13#include <support/constexpr_move_only.hpp>
14#include <support/tracked_move_only.hpp>
15
16#include <string>
17#include <type_traits>
18#include <utility>
19namespace hana = boost::hana;
20
21
22constexpr bool in_constexpr_context() {
23 auto t0 = hana::make_map(
24 hana::make_pair(ConstexprMoveOnly<2>{}, ConstexprMoveOnly<20>{}),
25 hana::make_pair(ConstexprMoveOnly<3>{}, ConstexprMoveOnly<30>{}));
26 auto t_implicit = std::move(t0);
27 auto t_explicit(std::move(t_implicit));
28
29 (void)t_implicit;
30 (void)t_explicit;
31 return true;
32}
33
34static_assert(in_constexpr_context(), "");
35
36
37struct NoMove {
38 NoMove() = default;
39 NoMove(NoMove const&) = delete;
40 NoMove(NoMove&&) = delete;
41 friend auto operator==(NoMove const&, NoMove const&) { return hana::true_c; }
42 friend auto operator!=(NoMove const&, NoMove const&) { return hana::false_c; }
43};
44
45// Note: It is also useful to check with a non-empty class, because that
46// triggers different instantiations due to EBO.
47struct NoMove_nonempty {
48 NoMove_nonempty() = default;
49 NoMove_nonempty(NoMove_nonempty const&) = delete;
50 NoMove_nonempty(NoMove_nonempty&&) = delete;
51 int i;
52 friend auto operator==(NoMove_nonempty const&, NoMove_nonempty const&) { return hana::true_c; }
53 friend auto operator!=(NoMove_nonempty const&, NoMove_nonempty const&) { return hana::false_c; }
54};
55
56namespace boost { namespace hana {
57 template <>
58 struct hash_impl<NoMove> {
59 static constexpr auto apply(NoMove const&)
60 { return hana::type_c<NoMove>; };
61 };
62
63 template <>
64 struct hash_impl<NoMove_nonempty> {
65 static constexpr auto apply(NoMove_nonempty const&)
66 { return hana::type_c<NoMove_nonempty>; };
67 };
68}}
69
70int main() {
71 {
72 auto t0 = hana::make_map();
73 auto t_implicit = std::move(t0);
74 auto t_explicit(std::move(t_implicit));
75
76 (void)t_explicit;
77 (void)t_implicit;
78 }
79 {
80 auto t0 = hana::make_map(hana::make_pair(TrackedMoveOnly<1>{}, TrackedMoveOnly<10>{}));
81 auto t_implicit = std::move(t0);
82 auto t_explicit(std::move(t_implicit));
83
84 (void)t_implicit;
85 (void)t_explicit;
86 }
87 {
88 auto t0 = hana::make_map(hana::make_pair(TrackedMoveOnly<1>{}, TrackedMoveOnly<10>{}),
89 hana::make_pair(TrackedMoveOnly<2>{}, TrackedMoveOnly<20>{}));
90 auto t_implicit = std::move(t0);
91 auto t_explicit(std::move(t_implicit));
92
93 (void)t_implicit;
94 (void)t_explicit;
95 }
96 {
97 auto t0 = hana::make_map(hana::make_pair(TrackedMoveOnly<1>{}, TrackedMoveOnly<10>{}),
98 hana::make_pair(TrackedMoveOnly<2>{}, TrackedMoveOnly<20>{}),
99 hana::make_pair(TrackedMoveOnly<3>{}, TrackedMoveOnly<30>{}));
100 auto t_implicit = std::move(t0);
101 auto t_explicit(std::move(t_implicit));
102
103 (void)t_implicit;
104 (void)t_explicit;
105 }
106 {
107 auto t0 = hana::make_map(hana::make_pair(hana::int_c<2>, std::string{"abcdef"}));
108 auto moved = std::move(t0);
109 BOOST_HANA_RUNTIME_CHECK(
110 moved == hana::make_map(hana::make_pair(hana::int_c<2>, std::string{"abcdef"}))
111 );
112 }
113
114 {
115 using Map1 = hana::map<hana::pair<NoMove, NoMove>>;
116 Map1 map1; (void)map1;
117 static_assert(!std::is_move_constructible<Map1>::value, "");
118
119 using Map2 = hana::map<hana::pair<NoMove_nonempty, NoMove_nonempty>>;
120 Map2 map2; (void)map2;
121 static_assert(!std::is_move_constructible<Map2>::value, "");
122 }
123}
124

source code of boost/libs/hana/test/map/cnstr.move.cpp