/*
 *  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/pair.h>
#include <thrust/system/detail/generic/tag.h>

THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{

template <typename ExecutionPolicy, typename ForwardIterator1, typename ForwardIterator2>
_CCCL_HOST_DEVICE thrust::pair<ForwardIterator1, ForwardIterator2> unique_by_key(
  thrust::execution_policy<ExecutionPolicy>& exec,
  ForwardIterator1 keys_first,
  ForwardIterator1 keys_last,
  ForwardIterator2 values_first);

template <typename ExecutionPolicy, typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
_CCCL_HOST_DEVICE thrust::pair<ForwardIterator1, ForwardIterator2> unique_by_key(
  thrust::execution_policy<ExecutionPolicy>& exec,
  ForwardIterator1 keys_first,
  ForwardIterator1 keys_last,
  ForwardIterator2 values_first,
  BinaryPredicate binary_pred);

template <typename ExecutionPolicy,
          typename InputIterator1,
          typename InputIterator2,
          typename OutputIterator1,
          typename OutputIterator2>
_CCCL_HOST_DEVICE thrust::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
  thrust::execution_policy<ExecutionPolicy>& exec,
  InputIterator1 keys_first,
  InputIterator1 keys_last,
  InputIterator2 values_first,
  OutputIterator1 keys_output,
  OutputIterator2 values_output);

template <typename ExecutionPolicy,
          typename InputIterator1,
          typename InputIterator2,
          typename OutputIterator1,
          typename OutputIterator2,
          typename BinaryPredicate>
_CCCL_HOST_DEVICE thrust::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
  thrust::execution_policy<ExecutionPolicy>& exec,
  InputIterator1 keys_first,
  InputIterator1 keys_last,
  InputIterator2 values_first,
  OutputIterator1 keys_output,
  OutputIterator2 values_output,
  BinaryPredicate binary_pred);

} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END

#include <thrust/system/detail/generic/unique_by_key.inl>
