ceph/src/boost/libs/compute/include/boost/compute/algorithm/partition_copy.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_PARTITION_COPY_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_PARTITION_COPY_HPP
  13
  14 #include <boost/compute/system.hpp>
  15 #include <boost/compute/functional.hpp>
  16 #include <boost/compute/command_queue.hpp>
  17 #include <boost/compute/algorithm/copy_if.hpp>
  18
  19 namespace boost {
  20 namespace compute {
  21
  22 /// Copies all of the elements in the range [\p first, \p last) for which
  23 /// \p predicate returns \c true to the range beginning at \p first_true
  24 /// and all of the elements for which \p predicate returns \c false to
  25 /// the range beginning at \p first_false.
  26 ///
  27 /// \see partition()
  28 template<class InputIterator,
  29          class OutputIterator1,
  30          class OutputIterator2,
  31          class UnaryPredicate>
  32 inline std::pair<OutputIterator1, OutputIterator2>
  33 partition_copy(InputIterator first,
  34                InputIterator last,
  35                OutputIterator1 first_true,
  36                OutputIterator2 first_false,
  37                UnaryPredicate predicate,
  38                command_queue &queue = system::default_queue())
  39 {
  40     // copy true values
  41     OutputIterator1 last_true =
  42         ::boost::compute::copy_if(first,
  43                                   last,
  44                                   first_true,
  45                                   predicate,
  46                                   queue);
  47
  48     // copy false values
  49     OutputIterator2 last_false =
  50         ::boost::compute::copy_if(first,
  51                                   last,
  52                                   first_false,
  53                                   not1(predicate),
  54                                   queue);
  55
  56     // return iterators to the end of the true and the false ranges
  57     return std::make_pair(last_true, last_false);
  58 }
  59
  60 } // end compute namespace
  61 } // end boost namespace
  62
  63 #endif // BOOST_COMPUTE_ALGORITHM_PARTITION_COPY_HPP