ceph/src/boost/libs/compute/include/boost/compute/algorithm/replace_copy.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_ALGORITHM_REPLACE_COPY_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_REPLACE_COPY_HPP
  13
  14 #include <iterator>
  15
  16 #include <boost/compute/system.hpp>
  17 #include <boost/compute/command_queue.hpp>
  18 #include <boost/compute/algorithm/copy.hpp>
  19 #include <boost/compute/algorithm/replace.hpp>
  20
  21 namespace boost {
  22 namespace compute {
  23
  24 /// Copies the value in the range [\p first, \p last) to the range
  25 /// beginning at \p result while replacing each instance of \p old_value
  26 /// with \p new_value.
  27 ///
  28 /// \see replace()
  29 template<class InputIterator, class OutputIterator, class T>
  30 inline OutputIterator
  31 replace_copy(InputIterator first,
  32              InputIterator last,
  33              OutputIterator result,
  34              const T &old_value,
  35              const T &new_value,
  36              command_queue &queue = system::default_queue())
  37 {
  38     typedef typename std::iterator_traits<OutputIterator>::difference_type difference_type;
  39
  40     difference_type count = std::distance(first, last);
  41     if(count == 0){
  42         return result;
  43     }
  44
  45     // copy data to result
  46     ::boost::compute::copy(first, last, result, queue);
  47
  48     // replace in result
  49     ::boost::compute::replace(result,
  50                               result + count,
  51                               old_value,
  52                               new_value,
  53                               queue);
  54
  55     // return iterator to the end of result
  56     return result + count;
  57 }
  58
  59 } // end compute namespace
  60 } // end boost namespace
  61
  62 #endif // BOOST_COMPUTE_ALGORITHM_REPLACE_COPY_HPP