//===----------------------------------------------------------------------===//
//
// Part of libcu++, the C++ Standard Library for your entire system,
// under the Apache License v2.0 with LLVM Exceptions.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

// <cuda/std/array>

// reference at (size_type); // constexpr in C++17

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

#include "test_macros.h"

#ifndef TEST_HAS_NO_EXCEPTIONS
#  include <stdexcept>
#endif // !TEST_HAS_NO_EXCEPTIONS

__host__ __device__ constexpr bool tests()
{
  {
    typedef double T;
    typedef cuda::std::array<T, 3> C;
    C c                      = {1, 2, 3.5};
    typename C::reference r1 = c.at(0);
    assert(r1 == 1);
    r1 = 5.5;
    assert(c[0] == 5.5);

    typename C::reference r2 = c.at(2);
    assert(r2 == 3.5);
    r2 = 7.5;
    assert(c[2] == 7.5);
  }
  return true;
}

#ifndef TEST_HAS_NO_EXCEPTIONS
void test_exceptions()
{
  {
    cuda::std::array<int, 4> array = {1, 2, 3, 4};

    try
    {
      TEST_IGNORE_NODISCARD array.at(4);
      assert(false);
    }
    catch (std::out_of_range const&)
    {
      // pass
    }
    catch (...)
    {
      assert(false);
    }

    try
    {
      TEST_IGNORE_NODISCARD array.at(5);
      assert(false);
    }
    catch (std::out_of_range const&)
    {
      // pass
    }
    catch (...)
    {
      assert(false);
    }

    try
    {
      TEST_IGNORE_NODISCARD array.at(6);
      assert(false);
    }
    catch (std::out_of_range const&)
    {
      // pass
    }
    catch (...)
    {
      assert(false);
    }

    try
    {
      using size_type = decltype(array)::size_type;
      TEST_IGNORE_NODISCARD array.at(static_cast<size_type>(-1));
      assert(false);
    }
    catch (std::out_of_range const&)
    {
      // pass
    }
    catch (...)
    {
      assert(false);
    }
  }

  {
    cuda::std::array<int, 0> array = {};

    try
    {
      TEST_IGNORE_NODISCARD array.at(0);
      assert(false);
    }
    catch (std::out_of_range const&)
    {
      // pass
    }
    catch (...)
    {
      assert(false);
    }
  }
}
#endif // !TEST_HAS_NO_EXCEPTIONS

int main(int, char**)
{
  tests();
#ifndef TEST_HAS_NO_EXCEPTIONS
  NV_IF_TARGET(NV_IS_HOST, (test_exceptions();))
#endif // !TEST_HAS_NO_EXCEPTIONS

  static_assert(tests(), "");
  return 0;
}
