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)
5 #include <boost/hana/ext/std/pair.hpp>
6 #include <boost/hana/first.hpp>
7 #include <boost/hana/second.hpp>
10 namespace hana = boost::hana;
14 T const& cref(T& t) { return t; }
16 // a non-movable, non-copyable type
20 RefOnly(RefOnly const&) = delete;
21 RefOnly(RefOnly&&) = delete;
25 // This test makes sure that we return the proper reference types from
26 // `first` and `second`.
27 std::pair<RefOnly<0>, RefOnly<1>> p;
30 RefOnly<0>&& r1 = hana::first(std::move(p));
31 RefOnly<0>& r2 = hana::first(p);
32 RefOnly<0> const& r3 = hana::first(cref(p));
34 (void)r1; (void)r2; (void)r3;
38 RefOnly<1>&& r1 = hana::second(std::move(p));
39 RefOnly<1>& r2 = hana::second(p);
40 RefOnly<1> const& r3 = hana::second(cref(p));
42 (void)r1; (void)r2; (void)r3;