//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//

// <cuda/std/optional>

// The following special member functions should propagate the triviality of
// the element held in the optional (see P0602R4):
//
// constexpr optional(const optional& rhs);
// constexpr optional(optional&& rhs) noexcept(see below);
// constexpr optional<T>& operator=(const optional& rhs);
// constexpr optional<T>& operator=(optional&& rhs) noexcept(see below);

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

#if !defined(_CCCL_BUILTIN_ADDRESSOF)
#  define TEST_WORKAROUND_NO_ADDRESSOF
#endif

#include "archetypes.h"
#include "test_macros.h"

__host__ __device__ constexpr bool implies(bool p, bool q)
{
  return !p || q;
}

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

  static_assert(implies(cuda::std::is_trivially_copy_constructible_v<T>,
                        cuda::std::is_trivially_copy_constructible_v<O>),
                "optional<T> is trivially copy constructible if T is trivially copy constructible.");

  static_assert(implies(cuda::std::is_trivially_move_constructible_v<T>,
                        cuda::std::is_trivially_move_constructible_v<O>),
                "optional<T> is trivially move constructible if T is trivially move constructible");

  static_assert(implies(cuda::std::is_trivially_copy_constructible_v<T> && cuda::std::is_trivially_copy_assignable_v<T>
                          && cuda::std::is_trivially_destructible_v<T>,

                        cuda::std::is_trivially_copy_assignable_v<O>),
                "optional<T> is trivially copy assignable if T is "
                "trivially copy constructible, "
                "trivially copy assignable, and "
                "trivially destructible");

  static_assert(implies(cuda::std::is_trivially_move_constructible_v<T> && cuda::std::is_trivially_move_assignable_v<T>
                          && cuda::std::is_trivially_destructible_v<T>,

                        cuda::std::is_trivially_move_assignable_v<O>),
                "optional<T> is trivially move assignable if T is "
                "trivially move constructible, "
                "trivially move assignable, and"
                "trivially destructible.");

  using ORef = cuda::std::optional<T&>;
  static_assert(cuda::std::is_trivially_copy_constructible_v<ORef>, "optional<T&> is trivially copy constructible.");
  static_assert(cuda::std::is_trivially_move_constructible_v<ORef>, "optional<T&> is trivially move constructible.");
  static_assert(cuda::std::is_trivially_copy_assignable_v<ORef>, "optional<T> is trivially copy assignable.");
  static_assert(cuda::std::is_trivially_move_assignable_v<ORef>, "optional<T> is trivially move assignable.");
};

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

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

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

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

int main(int, char**)
{
  sink(ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
       ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
       NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
       NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
       DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{});
  return 0;
}