ceph/src/boost/boost/compute/algorithm/generate.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_GENERATE_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_GENERATE_HPP
  13
  14 #include <boost/compute/system.hpp>
  15 #include <boost/compute/command_queue.hpp>
  16 #include <boost/compute/algorithm/copy.hpp>
  17 #include <boost/compute/iterator/function_input_iterator.hpp>
  18 #include <boost/compute/detail/iterator_range_size.hpp>
  19
  20 namespace boost {
  21 namespace compute {
  22
  23 /// Stores the result of \p generator for each element in the range
  24 /// [\p first, \p last).
  25 ///
  26 /// Space complexity: \Omega(1)
  27 template<class OutputIterator, class Generator>
  28 inline void generate(OutputIterator first,
  29                      OutputIterator last,
  30                      Generator generator,
  31                      command_queue &queue = system::default_queue())
  32 {
  33     size_t count = detail::iterator_range_size(first, last);
  34     if(count == 0){
  35         return;
  36     }
  37
  38     ::boost::compute::copy(
  39         ::boost::compute::make_function_input_iterator(generator,
  40                                                        first.get_index()),
  41         ::boost::compute::make_function_input_iterator(generator,
  42                                                        last.get_index()),
  43         first,
  44         queue
  45     );
  46 }
  47
  48 } // end compute namespace
  49 } // end boost namespace
  50
  51 #endif // BOOST_COMPUTE_ALGORITHM_GENERATE_HPP