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/tuple.hpp>
7
8#include <type_traits>
9#include <utility>
10namespace hana = boost::hana;
11
12
13struct MoveOnly {
14 int data_;
15 MoveOnly(MoveOnly const&) = delete;
16 MoveOnly& operator=(MoveOnly const&) = delete;
17 MoveOnly(int data = 1) : data_(data) { }
18 MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
19
20 MoveOnly& operator=(MoveOnly&& x)
21 { data_ = x.data_; x.data_ = 0; return *this; }
22
23 int get() const {return data_;}
24 bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
25 bool operator< (const MoveOnly& x) const { return data_ < x.data_; }
26};
27
28int main() {
29 {
30 using T = hana::tuple<>;
31 T t0;
32 T t = std::move(t0); (void)t;
33 }
34 {
35 using T = hana::tuple<MoveOnly>;
36 T t0(MoveOnly(0));
37 T t = std::move(t0); (void)t;
38 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
39 }
40 {
41 using T = hana::tuple<MoveOnly, MoveOnly>;
42 T t0(MoveOnly(0), MoveOnly(1));
43 T t = std::move(t0); (void)t;
44 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
45 BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
46 }
47 {
48 using T = hana::tuple<MoveOnly, MoveOnly, MoveOnly>;
49 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
50 T t = std::move(t0); (void)t;
51 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
52 BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
53 BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 2);
54 }
55 {
56 // Check for SFINAE-friendliness
57 static_assert(!std::is_constructible<
58 hana::tuple<MoveOnly>, MoveOnly const&
59 >{}, "");
60
61 static_assert(!std::is_constructible<
62 hana::tuple<MoveOnly>, MoveOnly&
63 >{}, "");
64
65 static_assert(std::is_constructible<
66 hana::tuple<MoveOnly>, MoveOnly
67 >{}, "");
68
69 static_assert(std::is_constructible<
70 hana::tuple<MoveOnly>, MoveOnly&&
71 >{}, "");
72 }
73}
74

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