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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/at.hpp>
- #include <boost/hana/back.hpp>
- #include <boost/hana/front.hpp>
- #include <boost/hana/tuple.hpp>
- #include <utility>
- namespace hana = boost::hana;
- // This test checks for move-only friendliness and reference semantics.
- struct MoveOnly {
- MoveOnly() = default;
- MoveOnly(MoveOnly&&) = default;
- MoveOnly& operator=(MoveOnly&&) = default;
- MoveOnly(MoveOnly const&) = delete;
- MoveOnly& operator=(MoveOnly const&) = delete;
- };
- int main() {
- {
- auto xs = hana::make_tuple(MoveOnly{});
- auto by_val = [](auto) { };
- by_val(std::move(xs));
- by_val(hana::front(std::move(xs)));
- by_val(hana::at_c<0>(std::move(xs)));
- by_val(hana::back(std::move(xs)));
- }
- {
- auto const& xs = hana::make_tuple(MoveOnly{});
- auto by_const_ref = [](auto const&) { };
- by_const_ref(xs);
- by_const_ref(hana::front(xs));
- by_const_ref(hana::at_c<0>(xs));
- by_const_ref(hana::back(xs));
- }
- {
- auto xs = hana::make_tuple(MoveOnly{});
- auto by_ref = [](auto&) { };
- by_ref(xs);
- by_ref(hana::front(xs));
- by_ref(hana::at_c<0>(xs));
- by_ref(hana::back(xs));
- }
- }
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