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

// We voluntarily use cuda::std::default_initializable on types that have redundant
// or ignored cv-qualifiers -- don't warn about it.
// ADDITIONAL_COMPILE_FLAGS: -Wno-ignored-qualifiers

// template<class T>
//     concept default_initializable = constructible_from<T> &&
//     requires { T{}; } &&
//     is-default-initializable<T>;

#include <cuda/std/array>
#include <cuda/std/concepts>

#include "test_macros.h"

struct Empty
{};

struct CtorDefaulted
{
  CtorDefaulted() = default;
};
struct CtorDeleted
{
  CtorDeleted() = delete;
};
struct DtorDefaulted
{
  ~DtorDefaulted() = default;
};
struct DtorDeleted
{
  ~DtorDeleted() = delete;
};

struct Noexcept
{
  __host__ __device__ ~Noexcept() noexcept;
};
struct NoexceptTrue
{
  __host__ __device__ ~NoexceptTrue() noexcept(true);
};
struct NoexceptFalse
{
  __host__ __device__ ~NoexceptFalse() noexcept(false);
};

struct CtorProtected
{
protected:
  CtorProtected() = default;
};
struct CtorPrivate
{
private:
  CtorPrivate() = default;
};
struct DtorProtected
{
protected:
  ~DtorProtected() = default;
};
struct DtorPrivate
{
private:
  ~DtorPrivate() = default;
};

template <class T>
struct NoexceptDependant
{
  __host__ __device__ ~NoexceptDependant() noexcept(cuda::std::is_same_v<T, int>);
};

struct CtorExplicit
{
  explicit CtorExplicit() = default;
};
struct CtorArgument
{
  __host__ __device__ CtorArgument(int) {}
};
struct CtorDefaultArgument
{
  __host__ __device__ CtorDefaultArgument(int = 0) {}
};
struct CtorExplicitDefaultArgument
{
  __host__ __device__ explicit CtorExplicitDefaultArgument(int = 0) {}
};

struct Derived : public Empty
{};

class Abstract
{
  __host__ __device__ virtual void foo() = 0;
};

class AbstractDestructor
{
  __host__ __device__ virtual ~AbstractDestructor() = 0;
};

class OperatorNewDeleted
{
  void* operator new(cuda::std::size_t) = delete;
  void operator delete(void* ptr)       = delete;
};

template <class T>
__host__ __device__ void test_not_const()
{
  static_assert(cuda::std::default_initializable<T>, "");
  static_assert(cuda::std::default_initializable<volatile T>, "");
#if !TEST_COMPILER(MSVC) // nvbug3953465
  static_assert(!cuda::std::default_initializable<const T>, "");
  static_assert(!cuda::std::default_initializable<const volatile T>, "");
#endif // !TEST_COMPILER(MSVC)
}

template <class T>
__host__ __device__ void test_true()
{
  static_assert(cuda::std::default_initializable<T>, "");
  static_assert(cuda::std::default_initializable<const T>, "");
  static_assert(cuda::std::default_initializable<volatile T>, "");
  static_assert(cuda::std::default_initializable<const volatile T>, "");
}

template <class T>
__host__ __device__ void test_false()
{
  static_assert(!cuda::std::default_initializable<T>, "");
  static_assert(!cuda::std::default_initializable<const T>, "");
  static_assert(!cuda::std::default_initializable<volatile T>, "");
  static_assert(!cuda::std::default_initializable<const volatile T>, "");
}

__host__ __device__ void test()
{
  test_not_const<bool>();
  test_not_const<char>();
  test_not_const<int>();
  test_not_const<double>();

  test_false<void>();
  test_not_const<void*>();

  test_not_const<int*>();
  test_false<int[]>();
  test_not_const<int[1]>();
  test_false<int&>();
  test_false<int&&>();

  test_true<Empty>();

  test_true<CtorDefaulted>();
  test_false<CtorDeleted>();
  test_true<DtorDefaulted>();
  test_false<DtorDeleted>();

  test_true<Noexcept>();
  test_true<NoexceptTrue>();
#if !TEST_COMPILER(NVHPC)
  test_false<NoexceptFalse>();
#endif // TEST_COMPILER(NVHPC)

  test_false<CtorProtected>();
  test_false<CtorPrivate>();
  test_false<DtorProtected>();
  test_false<DtorPrivate>();

  test_true<NoexceptDependant<int>>();
#if !TEST_COMPILER(NVHPC)
  test_false<NoexceptDependant<double>>();
#endif // TEST_COMPILER(NVHPC)

  test_true<CtorExplicit>();
  test_false<CtorArgument>();
  test_true<CtorDefaultArgument>();
  test_true<CtorExplicitDefaultArgument>();

  test_true<Derived>();
  test_false<Abstract>();
  test_false<AbstractDestructor>();

  test_true<OperatorNewDeleted>();

#if !TEST_COMPILER(GCC, <, 12) // type qualifiers ignored on cast result type [-Werror=ignored-qualifiers]
  test_not_const<void (*)(const int&)>();
  test_not_const<void (Empty::*)(const int&)>();
  test_not_const<void (Empty::*)(const int&) const>();
  test_not_const<void (Empty::*)(const int&) volatile>();
  test_not_const<void (Empty::*)(const int&) const volatile>();
  test_not_const<void (Empty::*)(const int&)&>();
  test_not_const<void (Empty::*)(const int&) &&>();
  test_not_const<void (Empty::*)(const int&) noexcept>();
  test_not_const<void (Empty::*)(const int&) noexcept(true)>();
  test_not_const<void (Empty::*)(const int&) noexcept(false)>();
#endif // !TEST_COMPILER(GCC, <, 12)

  // Sequence containers
  test_not_const<cuda::std::array<int, 0>>();
  test_not_const<cuda::std::array<int, 1>>();
  test_false<cuda::std::array<const int, 1>>();
  test_not_const<cuda::std::array<volatile int, 1>>();
  test_false<cuda::std::array<const volatile int, 1>>();
}

// Required for MSVC internal test runner compatibility.
int main(int, char**)
{
  return 0;
}
