98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/first.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/second.hpp>
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#include <type_traits>
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#include <utility>
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namespace hana = boost::hana;
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struct MoveOnly {
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int data_;
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MoveOnly(MoveOnly const&) = delete;
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MoveOnly& operator=(MoveOnly const&) = delete;
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MoveOnly(int data) : data_(data) { }
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MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
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MoveOnly& operator=(MoveOnly&& x)
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{ data_ = x.data_; x.data_ = 0; return *this; }
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bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
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};
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struct MoveOnlyDerived : MoveOnly {
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MoveOnlyDerived(MoveOnlyDerived&&) = default;
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MoveOnlyDerived(int data = 1) : MoveOnly(data) { }
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};
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template <typename Target>
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struct implicit_to {
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constexpr operator Target() const { return Target{}; }
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};
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struct NoMove {
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NoMove() = default;
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NoMove(NoMove const&) = delete;
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NoMove(NoMove&&) = delete;
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};
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// Note: It is also useful to check with a non-empty class, because that
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// triggers different instantiations due to EBO.
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struct NoMove_nonempty {
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NoMove_nonempty() = default;
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NoMove_nonempty(NoMove_nonempty const&) = delete;
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NoMove_nonempty(NoMove_nonempty&&) = delete;
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int i;
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};
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int main() {
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{
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hana::pair<MoveOnly, short> p1(MoveOnly{3}, 4);
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hana::pair<MoveOnly, short> p2(std::move(p1));
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3});
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
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}
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// Make sure it works across pair types
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{
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hana::pair<MoveOnlyDerived, short> p1(MoveOnlyDerived{3}, 4);
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hana::pair<MoveOnly, long> p2 = std::move(p1);
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == MoveOnly{3});
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
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}
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{
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struct target1 {
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target1() = default;
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target1(target1 const&) = delete;
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target1(target1&&) = default;
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};
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struct target2 {
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target2() = default;
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target2(target2 const&) = delete;
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target2(target2&&) = default;
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};
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using Target = hana::pair<target1, target2>;
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Target p1(hana::make_pair(target1{}, target2{})); (void)p1;
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Target p2(hana::make_pair(implicit_to<target1>{}, target2{})); (void)p2;
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Target p3(hana::make_pair(target1{}, implicit_to<target2>{})); (void)p3;
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Target p4(hana::make_pair(implicit_to<target1>{}, implicit_to<target2>{})); (void)p4;
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}
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// Make sure we don't define the move constructor when it shouldn't be defined.
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{
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using Pair1 = hana::pair<NoMove, NoMove>;
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Pair1 pair1; (void)pair1;
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static_assert(!std::is_move_constructible<Pair1>::value, "");
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using Pair2 = hana::pair<NoMove_nonempty, NoMove_nonempty>;
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Pair2 pair2; (void)pair2;
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static_assert(!std::is_move_constructible<Pair2>::value, "");
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}
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}
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