text: /*
   *  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.
   */
  
  #include <thrust/detail/config.h>
  #include <thrust/system/detail/generic/distance.h>
  #include <thrust/iterator/iterator_traits.h>
  
  namespace thrust
  {
  namespace system
  {
  namespace detail
  {
  namespace generic
  {
  namespace detail
  {
  
  
  __thrust_exec_check_disable__
  template<typename InputIterator>
  inline __host__ __device__
    typename thrust::iterator_traits<InputIterator>::difference_type
      distance(InputIterator first, InputIterator last, thrust::incrementable_traversal_tag)
  {
    typename thrust::iterator_traits<InputIterator>::difference_type result(0);
  
    while(first != last)
    {
      ++first;
      ++result;
    } // end while
  
    return result;
  } // end advance()
  
  
  __thrust_exec_check_disable__
  template<typename InputIterator>
  inline __host__ __device__
    typename thrust::iterator_traits<InputIterator>::difference_type
      distance(InputIterator first, InputIterator last, thrust::random_access_traversal_tag)
  {
    return last - first;
  } // end distance()
  
  
  } // end detail
  
  __thrust_exec_check_disable__
  template<typename InputIterator>
  inline __host__ __device__
    typename thrust::iterator_traits<InputIterator>::difference_type
      distance(InputIterator first, InputIterator last)
  {
    // dispatch on iterator traversal
    return thrust::system::detail::generic::detail::distance(first, last,
      typename thrust::iterator_traversal<InputIterator>::type());
  } // end advance()
  
  
  } // end namespace generic
  } // end namespace detail
  } // end namespace system
  } // end namespace thrust
  
  