/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header
#include <thrust/detail/internal_functional.h>
#include <thrust/find.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/system/detail/generic/mismatch.h>

THRUST_NAMESPACE_BEGIN
namespace system::detail::generic
{
template <typename DerivedPolicy, typename InputIterator1, typename InputIterator2>
_CCCL_HOST_DEVICE ::cuda::std::pair<InputIterator1, InputIterator2> mismatch(
  thrust::execution_policy<DerivedPolicy>& exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2)
{
  using namespace thrust::placeholders;

  return thrust::mismatch(exec, first1, last1, first2, _1 == _2);
} // end mismatch()

template <typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename BinaryPredicate>
_CCCL_HOST_DEVICE ::cuda::std::pair<InputIterator1, InputIterator2> mismatch(
  thrust::execution_policy<DerivedPolicy>& exec,
  InputIterator1 first1,
  InputIterator1 last1,
  InputIterator2 first2,
  BinaryPredicate pred)
{
  // Contributed by Erich Elsen
  using IteratorTuple = thrust::tuple<InputIterator1, InputIterator2>;
  using ZipIterator   = thrust::zip_iterator<IteratorTuple>;

  ZipIterator zipped_first = thrust::make_zip_iterator(first1, first2);
  ZipIterator zipped_last  = thrust::make_zip_iterator(last1, first2);

  ZipIterator result =
    thrust::find_if_not(exec, zipped_first, zipped_last, thrust::detail::tuple_binary_predicate<BinaryPredicate>{pred});

  return ::cuda::std::make_pair(
    thrust::get<0>(result.get_iterator_tuple()), thrust::get<1>(result.get_iterator_tuple()));
} // end mismatch()
} // namespace system::detail::generic
THRUST_NAMESPACE_END
