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/static_assert.hpp>
  15
  16 #include <boost/compute/lambda.hpp>
  17 #include <boost/compute/system.hpp>
  18 #include <boost/compute/command_queue.hpp>
  19 #include <boost/compute/algorithm/count_if.hpp>
  20 #include <boost/compute/type_traits/vector_size.hpp>
  21 #include <boost/compute/type_traits/is_device_iterator.hpp>
  22
  23 namespace boost {
  24 namespace compute {
  25
  26 /// Returns the number of occurrences of \p value in the range
  27 /// [\p first, \p last).
  28 ///
  29 /// Space complexity on CPUs: \Omega(1)<br>
  30 /// Space complexity on GPUs: \Omega(n)
  31 ///
  32 /// \see count_if()
  33 template<class InputIterator, class T>
  34 inline size_t count(InputIterator first,
  35                     InputIterator last,
  36                     const T &value,
  37                     command_queue &queue = system::default_queue())
  38 {
  39     BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
  40     typedef typename std::iterator_traits<InputIterator>::value_type value_type;
  41
  42     using ::boost::compute::_1;
  43     using ::boost::compute::lambda::all;
  44
  45     if(vector_size<value_type>::value == 1){
  46         return ::boost::compute::count_if(first,
  47                                           last,
  48                                           _1 == value,
  49                                           queue);
  50     }
  51     else {
  52         return ::boost::compute::count_if(first,
  53                                           last,
  54                                           all(_1 == value),
  55                                           queue);
  56     }
  57 }
  58
  59 } // end compute namespace
  60 } // end boost namespace
  61
  62 #endif // BOOST_COMPUTE_ALGORITHM_COUNT_HPP