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

// XFAIL: gcc-4

// <utility>

// template <class T1, class T2> struct pair

// pair(const T1& x, const T2& y);

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

#include "archetypes.h"
#include "test_convertible.h"
#include "test_macros.h"
using namespace ImplicitTypes; // Get implicitly archetypes

struct ExplicitT
{
  __host__ __device__ constexpr explicit ExplicitT(int x)
      : value(x)
  {}
  __host__ __device__ constexpr explicit ExplicitT(ExplicitT const& o)
      : value(o.value)
  {}
  int value;
};

struct ImplicitT
{
  __host__ __device__ constexpr ImplicitT(int x)
      : value(x)
  {}
  __host__ __device__ constexpr ImplicitT(ImplicitT const& o)
      : value(o.value)
  {}
  int value;
};

template <class T1, bool CanCopy = true, bool CanConvert = CanCopy>
__host__ __device__ void test_sfinae()
{
  using P1    = cuda::std::pair<T1, int>;
  using P2    = cuda::std::pair<int, T1>;
  using T1Arg = T1 const&;
  using T2    = int const&;
  static_assert(cuda::std::is_constructible<P1, T1Arg, T2>::value == CanCopy, "");
  static_assert(test_convertible<P1, T1Arg, T2>() == CanConvert, "");
  static_assert(cuda::std::is_constructible<P2, T2, T1Arg>::value == CanCopy, "");
  static_assert(test_convertible<P2, T2, T1Arg>() == CanConvert, "");
}

int main(int, char**)
{
  {
    typedef cuda::std::pair<float, short*> P;
    P p(3.5f, 0);
    assert(p.first == 3.5f);
    assert(p.second == nullptr);
  }
  {
    typedef cuda::std::pair<ImplicitT, int> P;
    P p(1, 2);
    assert(p.first.value == 1);
    assert(p.second == 2);
  }
  {
    test_sfinae<AllCtors>();
    test_sfinae<ExplicitTypes::AllCtors, true, false>();
    test_sfinae<CopyOnly>();
    test_sfinae<ExplicitTypes::CopyOnly, true, false>();
    test_sfinae<MoveOnly, false>();
    test_sfinae<ExplicitTypes::MoveOnly, false>();
    test_sfinae<NonCopyable, false>();
    test_sfinae<ExplicitTypes::NonCopyable, false>();
  }

  {
    typedef cuda::std::pair<float, short*> P;
    constexpr P p(3.5f, 0);
    static_assert(p.first == 3.5f, "");
    static_assert(p.second == nullptr, "");
  }
  {
    using P = cuda::std::pair<ExplicitT, int>;
    constexpr ExplicitT e(42);
    constexpr int x = 10;
    constexpr P p(e, x);
    static_assert(p.first.value == 42, "");
    static_assert(p.second == 10, "");
  }
  {
    using P = cuda::std::pair<ImplicitT, int>;
    constexpr ImplicitT e(42);
    constexpr int x = 10;
    constexpr P p   = {e, x};
    static_assert(p.first.value == 42, "");
    static_assert(p.second == 10, "");
  }

  return 0;
}
