ceph/src/boost/boost/compute/algorithm/for_each.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_FOR_EACH_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_FOR_EACH_HPP
  13
  14 #include <boost/compute/system.hpp>
  15 #include <boost/compute/command_queue.hpp>
  16 #include <boost/compute/detail/meta_kernel.hpp>
  17 #include <boost/compute/detail/iterator_range_size.hpp>
  18
  19 namespace boost {
  20 namespace compute {
  21 namespace detail {
  22
  23 template<class InputIterator, class Function>
  24 struct for_each_kernel : public meta_kernel
  25 {
  26     for_each_kernel(InputIterator first, InputIterator last, Function function)
  27         : meta_kernel("for_each")
  28     {
  29         // store range size
  30         m_count = detail::iterator_range_size(first, last);
  31
  32         // setup kernel source
  33         *this << function(first[get_global_id(0)]) << ";\n";
  34     }
  35
  36     void exec(command_queue &queue)
  37     {
  38         exec_1d(queue, 0, m_count);
  39     }
  40
  41     size_t m_count;
  42 };
  43
  44 } // end detail namespace
  45
  46 /// Calls \p function on each element in the range [\p first, \p last).
  47 ///
  48 /// Space complexity: \Omega(1)
  49 ///
  50 /// \see transform()
  51 template<class InputIterator, class UnaryFunction>
  52 inline UnaryFunction for_each(InputIterator first,
  53                               InputIterator last,
  54                               UnaryFunction function,
  55                               command_queue &queue = system::default_queue())
  56 {
  57     detail::for_each_kernel<InputIterator, UnaryFunction> kernel(first, last, function);
  58
  59     kernel.exec(queue);
  60
  61     return function;
  62 }
  63
  64 } // end compute namespace
  65 } // end boost namespace
  66
  67 #endif // BOOST_COMPUTE_ALGORITHM_FOR_EACH_HPP