/*
 *  Copyright 2008-2010 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 partition.h
 *  \brief Host implementations of partition functions
 */

#pragma once

#include <thrust/distance.h>

#include <algorithm>
#include <thrust/partition.h>

namespace thrust
{

namespace detail
{

namespace host
{

template<typename ForwardIterator,
         typename Predicate>
  ForwardIterator partition(ForwardIterator first,
                            ForwardIterator last,
                            Predicate pred)
{
    return std::partition(first, last, pred);
}


template<typename ForwardIterator,
         typename Predicate>
  ForwardIterator stable_partition(ForwardIterator first,
                                   ForwardIterator last,
                                   Predicate pred)
{
    return std::stable_partition(first, last, pred);
}

template<typename ForwardIterator1,
         typename ForwardIterator2,
         typename Predicate>
  ForwardIterator2 stable_partition_copy(ForwardIterator1 first,
                                         ForwardIterator1 last,
                                         ForwardIterator2 result,
                                         Predicate pred)
{
    for(ForwardIterator1 iter = first; iter != last; iter++)
        if(pred(*iter))
            *result++ = *iter;

    ForwardIterator2 middle = result;
    
    for(ForwardIterator1 iter = first; iter != last; iter++)
        if(!pred(*iter))
            *result++ = *iter;

    return middle;
}

template<typename ForwardIterator1,
         typename ForwardIterator2,
         typename Predicate>
  ForwardIterator2 partition_copy(ForwardIterator1 first,
                                  ForwardIterator1 last,
                                  ForwardIterator2 result,
                                  Predicate pred)
{
    return thrust::experimental::stable_partition_copy(first, last, result, pred);
}

} // end namespace host

} // end namespace detail

} // end namespace thrust