/*
 *  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.
 */


/*! \file merge.h
 *  \brief Sequential implementation of merge algorithms.
 */

#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/system/detail/sequential/execution_policy.h>

THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace sequential
{


template<typename DerivedPolicy,
         typename InputIterator1,
         typename InputIterator2,
         typename OutputIterator,
         typename StrictWeakOrdering>
__host__ __device__
OutputIterator merge(sequential::execution_policy<DerivedPolicy> &exec,
                     InputIterator1 first1,
                     InputIterator1 last1,
                     InputIterator2 first2,
                     InputIterator2 last2,
                     OutputIterator result,
                     StrictWeakOrdering comp);


template<typename DerivedPolicy,
         typename InputIterator1,
         typename InputIterator2,
         typename InputIterator3,
         typename InputIterator4,
         typename OutputIterator1,
         typename OutputIterator2,
         typename StrictWeakOrdering>
__host__ __device__
thrust::pair<OutputIterator1,OutputIterator2>
  merge_by_key(sequential::execution_policy<DerivedPolicy> &exec,
               InputIterator1 keys_first1,
               InputIterator1 keys_last1,
               InputIterator2 keys_first2,
               InputIterator2 keys_last2,
               InputIterator3 values_first1,
               InputIterator4 values_first2,
               OutputIterator1 keys_result,
               OutputIterator2 values_result,
               StrictWeakOrdering comp);


} // end namespace sequential
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END

#include <thrust/system/detail/sequential/merge.inl>