ceph/src/boost/libs/compute/include/boost/compute/algorithm/count_if.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_COUNT_IF_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_COUNT_IF_HPP
  13
  14 #include <boost/compute/device.hpp>
  15 #include <boost/compute/system.hpp>
  16 #include <boost/compute/command_queue.hpp>
  17 #include <boost/compute/algorithm/detail/count_if_with_ballot.hpp>
  18 #include <boost/compute/algorithm/detail/count_if_with_reduce.hpp>
  19 #include <boost/compute/algorithm/detail/count_if_with_threads.hpp>
  20 #include <boost/compute/algorithm/detail/serial_count_if.hpp>
  21 #include <boost/compute/detail/iterator_range_size.hpp>
  22
  23 namespace boost {
  24 namespace compute {
  25
  26 /// Returns the number of elements in the range [\p first, \p last)
  27 /// for which \p predicate returns \c true.
  28 template<class InputIterator, class Predicate>
  29 inline size_t count_if(InputIterator first,
  30                        InputIterator last,
  31                        Predicate predicate,
  32                        command_queue &queue = system::default_queue())
  33 {
  34     const device &device = queue.get_device();
  35
  36     size_t input_size = detail::iterator_range_size(first, last);
  37     if(input_size == 0){
  38         return 0;
  39     }
  40
  41     if(device.type() & device::cpu){
  42         if(input_size < 1024){
  43             return detail::serial_count_if(first, last, predicate, queue);
  44         }
  45         else {
  46             return detail::count_if_with_threads(first, last, predicate, queue);
  47         }
  48     }
  49     else {
  50         if(input_size < 32){
  51             return detail::serial_count_if(first, last, predicate, queue);
  52         }
  53         else {
  54             return detail::count_if_with_reduce(first, last, predicate, queue);
  55         }
  56     }
  57 }
  58
  59 } // end compute namespace
  60 } // end boost namespace
  61
  62 #endif // BOOST_COMPUTE_ALGORITHM_COUNT_IF_HPP