/*
 *  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 scatter.h
 *  \brief Host implementations of scatter and scatter_if
 */

#pragma once

namespace thrust
{

namespace detail
{

namespace host
{


template<typename InputIterator1,
         typename InputIterator2,
         typename RandomAccessIterator>
  void scatter(InputIterator1 first,
               InputIterator1 last,
               InputIterator2 map,
               RandomAccessIterator output)
{
    while(first != last)
    {
        output[*map] = *first;
        first++;
        map++;
    }
}


template<typename InputIterator1,
         typename InputIterator2,
         typename InputIterator3,
         typename RandomAccessIterator,
         typename Predicate>
  void scatter_if(InputIterator1 first,
                  InputIterator1 last,
                  InputIterator2 map,
                  InputIterator3 stencil,
                  RandomAccessIterator output,
                  Predicate pred)
{
    while(first != last)
    {
        if(pred(*stencil))
            output[*map] = *first;
        first++;
        map++;
        stencil++;
    }
}


} // end namespace host

} // end namespace detail

} // end namespace thrust