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

// <algorithm>

// template<ForwardIterator Iter1, ForwardIterator Iter2>
//   requires HasEqualTo<Iter1::value_type, Iter2::value_type>
//   constexpr Iter1  // constexpr after C++17
//   find_end(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);

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

#include "test_iterators.h"
#include "test_macros.h"

template <class Iter1, class Iter2>
__host__ __device__ constexpr bool test()
{
  int ia[]          = {0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 0, 1, 2, 3, 0, 1, 2, 0, 1, 0};
  const unsigned sa = sizeof(ia) / sizeof(ia[0]);
  int b[]           = {0};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(b), Iter2(b + 1)) == Iter1(ia + sa - 1));
  int c[] = {0, 1};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(c), Iter2(c + 2)) == Iter1(ia + 18));
  int d[] = {0, 1, 2};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(d), Iter2(d + 3)) == Iter1(ia + 15));
  int e[] = {0, 1, 2, 3};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(e), Iter2(e + 4)) == Iter1(ia + 11));
  int f[] = {0, 1, 2, 3, 4};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(f), Iter2(f + 5)) == Iter1(ia + 6));
  int g[] = {0, 1, 2, 3, 4, 5};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(g), Iter2(g + 6)) == Iter1(ia));
  int h[] = {0, 1, 2, 3, 4, 5, 6};
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(h), Iter2(h + 7)) == Iter1(ia + sa));
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia + sa), Iter2(b), Iter2(b)) == Iter1(ia + sa));
  assert(cuda::std::find_end(Iter1(ia), Iter1(ia), Iter2(b), Iter2(b + 1)) == Iter1(ia));

  return true;
}

int main(int, char**)
{
  test<forward_iterator<const int*>, forward_iterator<const int*>>();
  test<forward_iterator<const int*>, bidirectional_iterator<const int*>>();
  test<forward_iterator<const int*>, random_access_iterator<const int*>>();
  test<bidirectional_iterator<const int*>, forward_iterator<const int*>>();
  test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*>>();
  test<bidirectional_iterator<const int*>, random_access_iterator<const int*>>();
  test<random_access_iterator<const int*>, forward_iterator<const int*>>();
  test<random_access_iterator<const int*>, bidirectional_iterator<const int*>>();
  test<random_access_iterator<const int*>, random_access_iterator<const int*>>();

  static_assert(test<forward_iterator<const int*>, forward_iterator<const int*>>(), "");
  static_assert(test<forward_iterator<const int*>, bidirectional_iterator<const int*>>(), "");
  static_assert(test<forward_iterator<const int*>, random_access_iterator<const int*>>(), "");
  static_assert(test<bidirectional_iterator<const int*>, forward_iterator<const int*>>(), "");
  static_assert(test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*>>(), "");
  static_assert(test<bidirectional_iterator<const int*>, random_access_iterator<const int*>>(), "");
  static_assert(test<random_access_iterator<const int*>, forward_iterator<const int*>>(), "");
  static_assert(test<random_access_iterator<const int*>, bidirectional_iterator<const int*>>(), "");
  static_assert(test<random_access_iterator<const int*>, random_access_iterator<const int*>>(), "");

  return 0;
}
