//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11

// Throwing bad_optional_access is supported starting in macosx10.13
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions

// <cuda/std/optional>

// constexpr const T& optional<T>::value() const &;

#include <cuda/std/optional>
#include <cuda/std/type_traits>
#include <cuda/std/cassert>

#include "test_macros.h"

using cuda::std::optional;
using cuda::std::in_place_t;
using cuda::std::in_place;
#ifndef TEST_HAS_NO_EXCEPTIONS
using cuda::std::bad_optional_access;
#endif

struct X
{
    X() = default;
    X(const X&) = delete;
    __host__ __device__
    constexpr int test() const & {return 3;}
    __host__ __device__
    int test() & {return 4;}
    __host__ __device__
    constexpr int test() const && {return 5;}
    __host__ __device__
    int test() && {return 6;}
};

int main(int, char**)
{
    {
        const optional<X> opt; unused(opt);
        ASSERT_NOT_NOEXCEPT(opt.value());
        ASSERT_SAME_TYPE(decltype(opt.value()), X const&);
    }
#if !(defined(TEST_COMPILER_CUDACC_BELOW_11_3) && defined(TEST_COMPILER_CLANG))
    {
        constexpr optional<X> opt(in_place);
        static_assert(opt.value().test() == 3, "");
    }
#endif // !(defined(TEST_COMPILER_CUDACC_BELOW_11_3) && defined(TEST_COMPILER_CLANG))
    {
        const optional<X> opt(in_place);
        assert(opt.value().test() == 3);
    }
#ifndef TEST_HAS_NO_EXCEPTIONS
    {
        const optional<X> opt;
        try
        {
            (void)opt.value();
            assert(false);
        }
        catch (const bad_optional_access&)
        {
        }
    }
#endif

  return 0;
}
