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 <string>
9namespace hana = boost::hana;
10
11
12struct Empty { };
13
14int main() {
15 {
16 using T = hana::tuple<>;
17 T t0;
18 T t_implicit = t0;
19 T t_explicit(t0);
20
21 (void)t_explicit;
22 (void)t_implicit;
23 }
24 {
25 using T = hana::tuple<int>;
26 T t0(2);
27 T t = t0;
28 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2);
29 }
30 {
31 using T = hana::tuple<int, char>;
32 T t0(2, 'a');
33 T t = t0;
34 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2);
35 BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 'a');
36 }
37 {
38 using T = hana::tuple<int, char, std::string>;
39 const T t0(2, 'a', "some text");
40 T t = t0;
41 BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2);
42 BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 'a');
43 BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == "some text");
44 }
45 {
46 using T = hana::tuple<int>;
47 constexpr T t0(2);
48 constexpr T t = t0;
49 static_assert(hana::at_c<0>(xs: t) == 2, "");
50 }
51 {
52 using T = hana::tuple<Empty>;
53 constexpr T t0;
54 constexpr T t = t0;
55 constexpr Empty e = hana::at_c<0>(xs: t); (void)e;
56 }
57 {
58 struct T { };
59 struct U { };
60
61 constexpr hana::tuple<T, U> binary{};
62 constexpr hana::tuple<T, U> copy_implicit = binary;
63 constexpr hana::tuple<T, U> copy_explicit(binary);
64
65 (void)copy_implicit;
66 (void)copy_explicit;
67 }
68}
69

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