Imported Upstream version 1.64.0
[platform/upstream/boost.git] / libs / hana / test / tuple / at.rv.cpp
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/tuple.hpp>
7
8 #include <support/tracked.hpp>
9
10 #include <utility>
11 #include <memory>
12 namespace hana = boost::hana;
13
14
15 int main() {
16     {
17         using T = hana::tuple<std::unique_ptr<int>>;
18         T t(std::unique_ptr<int>(new int(3)));
19         std::unique_ptr<int> p = hana::at_c<0>(std::move(t));
20         BOOST_HANA_RUNTIME_CHECK(*p == 3);
21     }
22     // make sure we don't double-move and do other weird stuff
23     {
24         hana::tuple<Tracked, Tracked, Tracked> xs{
25             Tracked{1}, Tracked{2}, Tracked{3}
26         };
27
28         Tracked a = hana::at_c<0>(std::move(xs)); (void)a;
29         Tracked b = hana::at_c<1>(std::move(xs)); (void)b;
30         Tracked c = hana::at_c<2>(std::move(xs)); (void)c;
31     }
32     // test with nested closures
33     {
34         using Inner = hana::tuple<Tracked, Tracked>;
35         hana::tuple<Inner> xs{Inner{Tracked{1}, Tracked{2}}};
36
37         Tracked a = hana::at_c<0>(hana::at_c<0>(std::move(xs))); (void)a;
38         Tracked b = hana::at_c<1>(hana::at_c<0>(std::move(xs))); (void)b;
39     }
40 }