ceph/src/boost/boost/compute/algorithm/count.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_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_COUNT_HPP
  13
  14 #include <boost/compute/lambda.hpp>
  15 #include <boost/compute/system.hpp>
  16 #include <boost/compute/command_queue.hpp>
  17 #include <boost/compute/algorithm/count_if.hpp>
  18 #include <boost/compute/type_traits/vector_size.hpp>
  19
  20 namespace boost {
  21 namespace compute {
  22
  23 /// Returns the number of occurrences of \p value in the range
  24 /// [\p first, \p last).
  25 ///
  26 /// Space complexity on CPUs: \Omega(1)<br>
  27 /// Space complexity on GPUs: \Omega(n)
  28 ///
  29 /// \see count_if()
  30 template<class InputIterator, class T>
  31 inline size_t count(InputIterator first,
  32                     InputIterator last,
  33                     const T &value,
  34                     command_queue &queue = system::default_queue())
  35 {
  36     typedef typename std::iterator_traits<InputIterator>::value_type value_type;
  37
  38     using ::boost::compute::_1;
  39     using ::boost::compute::lambda::all;
  40
  41     if(vector_size<value_type>::value == 1){
  42         return ::boost::compute::count_if(first,
  43                                           last,
  44                                           _1 == value,
  45                                           queue);
  46     }
  47     else {
  48         return ::boost::compute::count_if(first,
  49                                           last,
  50                                           all(_1 == value),
  51                                           queue);
  52     }
  53 }
  54
  55 } // end compute namespace
  56 } // end boost namespace
  57
  58 #endif // BOOST_COMPUTE_ALGORITHM_COUNT_HPP