/*
 *  Copyright 2008-2012 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>
#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/iterator_adaptor.h>
#include <thrust/iterator/detail/any_assign.h>
#include <cstddef> // for std::ptrdiff_t

namespace thrust
{

// forward declaration of discard_iterator
template<typename> class discard_iterator;

namespace detail
{


template<typename System>
  struct discard_iterator_base
{
  // XXX value_type should actually be void
  //     but this interferes with zip_iterator<discard_iterator>
  typedef any_assign         value_type;
  typedef any_assign&        reference;
  typedef std::ptrdiff_t     incrementable;

  typedef typename thrust::counting_iterator<
    incrementable,
    System,
    thrust::random_access_traversal_tag
  > base_iterator;

  typedef typename thrust::iterator_adaptor<
    discard_iterator<System>,
    base_iterator,
    value_type,
    typename thrust::iterator_system<base_iterator>::type,
    typename thrust::iterator_traversal<base_iterator>::type,
    reference
  > type;
}; // end discard_iterator_base


} // end detail
  
} // end thrust