test/libcxx/utilities/optional/optional.object/special_member_gen.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>


#include <optional>
#include <type_traits>
#include <cassert>

#include "archetypes.hpp"

template <class T>
struct SpecialMemberTest {
    using O = std::optional<T>;

    template <template <class> class TestMF>
    static constexpr bool check_same() {
        return TestMF<O>::value == TestMF<T>::value;
    }

    // Test that optional inherits the correct trivial/non-trivial members
    static_assert(check_same<std::is_trivially_destructible>(), "");
    static_assert(check_same<std::is_trivially_copyable>(), "");
};

template <class ...Args> static void sink(Args&&...) {}

template <class ...TestTypes>
struct DoTestsMetafunction {
    DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
};

struct TrivialMoveNonTrivialCopy {
    TrivialMoveNonTrivialCopy() = default;
    TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
    TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
    TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
    TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
};

struct TrivialCopyNonTrivialMove {
    TrivialCopyNonTrivialMove() = default;
    TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
    TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
    TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
    TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
};

int main()
{
    sink(
        ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
        ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
        NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
        NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
        DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
    );
}