//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <cuda/std/tuple>

// template <class... Types> class tuple;

// template <size_t I, class... Types>
//   typename tuple_element<I, tuple<Types...> >::type&
//   get(tuple<Types...>& t);

#include <cuda/std/tuple>
// cuda::std::string not supported
// #include <cuda/std/string>
#include <cuda/std/cassert>

#include "test_macros.h"

struct Empty
{};

struct S
{
  cuda::std::tuple<int, Empty> a;
  int k;
  Empty e;
  __host__ __device__ constexpr S()
      : a{1, Empty{}}
      , k(cuda::std::get<0>(a))
      , e(cuda::std::get<1>(a))
  {}
};

__host__ __device__ constexpr cuda::std::tuple<int, int> getP()
{
  return {3, 4};
}

int main(int, char**)
{
  {
    typedef cuda::std::tuple<int> T;
    T t(3);
    assert(cuda::std::get<0>(t) == 3);
    cuda::std::get<0>(t) = 2;
    assert(cuda::std::get<0>(t) == 2);
  }
  // cuda::std::string not supported
  /*
  {
      typedef cuda::std::tuple<cuda::std::string, int> T;
      T t("high", 5);
      assert(cuda::std::get<0>(t) == "high");
      assert(cuda::std::get<1>(t) == 5);
      cuda::std::get<0>(t) = "four";
      cuda::std::get<1>(t) = 4;
      assert(cuda::std::get<0>(t) == "four");
      assert(cuda::std::get<1>(t) == 4);
  }
  {
      typedef cuda::std::tuple<double&, cuda::std::string, int> T;
      double d = 1.5;
      T t(d, "high", 5);
      assert(cuda::std::get<0>(t) == 1.5);
      assert(cuda::std::get<1>(t) == "high");
      assert(cuda::std::get<2>(t) == 5);
      cuda::std::get<0>(t) = 2.5;
      cuda::std::get<1>(t) = "four";
      cuda::std::get<2>(t) = 4;
      assert(cuda::std::get<0>(t) == 2.5);
      assert(cuda::std::get<1>(t) == "four");
      assert(cuda::std::get<2>(t) == 4);
      assert(d == 2.5);
  }
  */
  { // get on an rvalue tuple
    static_assert(cuda::std::get<0>(cuda::std::make_tuple(0.0f, 1, 2.0, 3L)) == 0, "");
    static_assert(cuda::std::get<1>(cuda::std::make_tuple(0.0f, 1, 2.0, 3L)) == 1, "");
    static_assert(cuda::std::get<2>(cuda::std::make_tuple(0.0f, 1, 2.0, 3L)) == 2, "");
    static_assert(cuda::std::get<3>(cuda::std::make_tuple(0.0f, 1, 2.0, 3L)) == 3, "");
    static_assert(S().k == 1, "");
    static_assert(cuda::std::get<1>(getP()) == 4, "");
  }

  return 0;
}
