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hunk.file_path: home/babel.config.js
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file: //---------------------------------------------------------------------------//
  // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
  //
  // Distributed under the Boost Software License, Version 1.0
  // See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt
  //
  // See http://boostorg.github.com/compute for more information.
  //---------------------------------------------------------------------------//
  
  #ifndef BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_SCAN_HPP
  #define BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_SCAN_HPP
  
  #include <iterator>
  
  #include <boost/compute/device.hpp>
  #include <boost/compute/kernel.hpp>
  #include <boost/compute/command_queue.hpp>
  #include <boost/compute/detail/meta_kernel.hpp>
  #include <boost/compute/detail/iterator_range_size.hpp>
  
  namespace boost {
  namespace compute {
  namespace detail {
  
  template<class InputIterator, class OutputIterator, class T, class BinaryOperator>
  inline OutputIterator serial_scan(InputIterator first,
                                    InputIterator last,
                                    OutputIterator result,
                                    bool exclusive,
                                    T init,
                                    BinaryOperator op,
                                    command_queue &queue)
  {
      if(first == last){
          return result;
      }
  
      typedef typename
          std::iterator_traits<InputIterator>::value_type input_type;
      typedef typename
          std::iterator_traits<OutputIterator>::value_type output_type;
  
      const context &context = queue.get_context();
  
      // create scan kernel
      meta_kernel k("serial_scan");
  
      // Arguments
      size_t n_arg = k.add_arg<ulong_>("n");
      size_t init_arg = k.add_arg<output_type>("initial_value");
  
      if(!exclusive){
          k <<
              k.decl<const ulong_>("start_idx") << " = 1;\n" <<
              k.decl<output_type>("sum") << " = " << first[0] << ";\n" <<
              result[0] << " = sum;\n";
      }
      else {
          k <<
              k.decl<const ulong_>("start_idx") << " = 0;\n" <<
              k.decl<output_type>("sum") << " = initial_value;\n";
      }
  
      k <<
          "for(ulong i = start_idx; i < n; i++){\n" <<
          k.decl<const input_type>("x") << " = "
              << first[k.var<ulong_>("i")] << ";\n";
  
      if(exclusive){
          k << result[k.var<ulong_>("i")] << " = sum;\n";
      }
  
      k << "    sum = "
          << op(k.var<output_type>("sum"), k.var<output_type>("x"))
          << ";\n";
  
      if(!exclusive){
          k << result[k.var<ulong_>("i")] << " = sum;\n";
      }
  
      k << "}\n";
  
      // compile scan kernel
      kernel scan_kernel = k.compile(context);
  
      // setup kernel arguments
      size_t n = detail::iterator_range_size(first, last);
      scan_kernel.set_arg<ulong_>(n_arg, n);
      scan_kernel.set_arg<output_type>(init_arg, static_cast<output_type>(init));
  
      // execute the kernel
      queue.enqueue_1d_range_kernel(scan_kernel, 0, 1, 1);
  
      // return iterator pointing to the end of the result range
      return result + n;
  }
  
  } // end detail namespace
  } // end compute namespace
  } // end boost namespace
  
  #endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_SCAN_HPP
  