text: /*
   *  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.
   */
  
  
  /*! \file adjacent_difference.h
   *  \brief Sequential implementation of adjacent_difference.
   */
  
  #pragma once
  
  #include <thrust/detail/config.h>
  #include <thrust/iterator/iterator_traits.h>
  
  namespace thrust
  {
  namespace system
  {
  namespace detail
  {
  namespace internal
  {
  namespace scalar
  {
  
  template <typename InputIterator,
            typename OutputIterator,
            typename BinaryFunction>
  OutputIterator adjacent_difference(InputIterator first,
                                     InputIterator last,
                                     OutputIterator result,
                                     BinaryFunction binary_op)
  {
    typedef typename thrust::iterator_traits<InputIterator>::value_type InputType;
  
    if (first == last)
      return result;
  
    InputType curr = *first;
  
    *result = curr;
  
    while (++first != last)
    {
      InputType next = *first;
      *(++result) = binary_op(next, curr);
      curr = next;
    }
  
    return ++result;
  }
  
  } // end namespace scalar
  } // end namespace internal
  } // end namespace detail
  } // end namespace system
  } // end namespace thrust
  
  