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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/assert.hpp>
- #include <boost/hana/first.hpp>
- #include <boost/hana/pair.hpp>
- #include <boost/hana/second.hpp>
- #include <type_traits>
- #include <utility>
- namespace hana = boost::hana;
- struct MoveOnly {
- int data_;
- MoveOnly(MoveOnly const&) = delete;
- MoveOnly& operator=(MoveOnly const&) = delete;
- MoveOnly(int data) : data_(data) { }
- MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
- MoveOnly& operator=(MoveOnly&& x)
- { data_ = x.data_; x.data_ = 0; return *this; }
- bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
- };
- struct MoveOnlyDerived : MoveOnly {
- MoveOnlyDerived(MoveOnlyDerived&&) = default;
- MoveOnlyDerived(int data = 1) : MoveOnly(data) { }
- };
- template <typename Target>
- struct implicit_to {
- constexpr operator Target() const { return Target{}; }
- };
- struct NoMove {
- NoMove() = default;
- NoMove(NoMove const&) = delete;
- NoMove(NoMove&&) = delete;
- };
- // Note: It is also useful to check with a non-empty class, because that
- // triggers different instantiations due to EBO.
- struct NoMove_nonempty {
- NoMove_nonempty() = default;
- NoMove_nonempty(NoMove_nonempty const&) = delete;
- NoMove_nonempty(NoMove_nonempty&&) = delete;
- int i;
- };
- int main() {
- {
- hana::pair<MoveOnly, short> p1(MoveOnly{3}, 4);
- hana::pair<MoveOnly, short> p2(std::move(p1));
- BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3});
- BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
- }
- // Make sure it works across pair types
- {
- hana::pair<MoveOnlyDerived, short> p1(MoveOnlyDerived{3}, 4);
- hana::pair<MoveOnly, long> p2 = std::move(p1);
- BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3});
- BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
- }
- {
- struct target1 {
- target1() = default;
- target1(target1 const&) = delete;
- target1(target1&&) = default;
- };
- struct target2 {
- target2() = default;
- target2(target2 const&) = delete;
- target2(target2&&) = default;
- };
- using Target = hana::pair<target1, target2>;
- Target p1(hana::make_pair(target1{}, target2{})); (void)p1;
- Target p2(hana::make_pair(implicit_to<target1>{}, target2{})); (void)p2;
- Target p3(hana::make_pair(target1{}, implicit_to<target2>{})); (void)p3;
- Target p4(hana::make_pair(implicit_to<target1>{}, implicit_to<target2>{})); (void)p4;
- }
- // Make sure we don't define the move constructor when it shouldn't be defined.
- {
- using Pair1 = hana::pair<NoMove, NoMove>;
- Pair1 pair1; (void)pair1;
- static_assert(!std::is_move_constructible<Pair1>::value, "");
- using Pair2 = hana::pair<NoMove_nonempty, NoMove_nonempty>;
- Pair2 pair2; (void)pair2;
- static_assert(!std::is_move_constructible<Pair2>::value, "");
- }
- }
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