ceph/src/boost/boost/compute/algorithm/copy_n.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_COPY_N_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_COPY_N_HPP
  13
  14 #include <boost/compute/system.hpp>
  15 #include <boost/compute/command_queue.hpp>
  16 #include <boost/compute/algorithm/copy.hpp>
  17
  18 namespace boost {
  19 namespace compute {
  20
  21 /// Copies \p count elements from \p first to \p result.
  22 ///
  23 /// For example, to copy four values from the host to the device:
  24 /// \code
  25 /// // values on the host and vector on the device
  26 /// float values[4] = { 1.f, 2.f, 3.f, 4.f };
  27 /// boost::compute::vector<float> vec(4, context);
  28 ///
  29 /// // copy from the host to the device
  30 /// boost::compute::copy_n(values, 4, vec.begin(), queue);
  31 /// \endcode
  32 ///
  33 /// Space complexity: \Omega(1)
  34 ///
  35 /// \see copy()
  36 template<class InputIterator, class Size, class OutputIterator>
  37 inline OutputIterator copy_n(InputIterator first,
  38                              Size count,
  39                              OutputIterator result,
  40                              command_queue &queue = system::default_queue())
  41 {
  42     typedef typename std::iterator_traits<InputIterator>::difference_type difference_type;
  43
  44     return ::boost::compute::copy(first,
  45                                   first + static_cast<difference_type>(count),
  46                                   result,
  47                                   queue);
  48 }
  49
  50 } // end compute namespace
  51 } // end boost namespace
  52
  53 #endif // BOOST_COMPUTE_ALGORITHM_COPY_N_HPP