ceph/src/boost/libs/compute/include/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 /// \see count_if()
  27 template<class InputIterator, class T>
  28 inline size_t count(InputIterator first,
  29                     InputIterator last,
  30                     const T &value,
  31                     command_queue &queue = system::default_queue())
  32 {
  33     typedef typename std::iterator_traits<InputIterator>::value_type value_type;
  34
  35     using ::boost::compute::_1;
  36     using ::boost::compute::lambda::all;
  37
  38     if(vector_size<value_type>::value == 1){
  39         return ::boost::compute::count_if(first,
  40                                           last,
  41                                           _1 == value,
  42                                           queue);
  43     }
  44     else {
  45         return ::boost::compute::count_if(first,
  46                                           last,
  47                                           all(_1 == value),
  48                                           queue);
  49     }
  50 }
  51
  52 } // end compute namespace
  53 } // end boost namespace
  54
  55 #endif // BOOST_COMPUTE_ALGORITHM_COUNT_HPP