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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 | /// | |
b32b8144 FG |
27 | /// Space complexity: \Omega(2n) |
28 | /// | |
7c673cae FG |
29 | /// \see partition() |
30 | template<class InputIterator, | |
31 | class OutputIterator1, | |
32 | class OutputIterator2, | |
33 | class UnaryPredicate> | |
34 | inline std::pair<OutputIterator1, OutputIterator2> | |
35 | partition_copy(InputIterator first, | |
36 | InputIterator last, | |
37 | OutputIterator1 first_true, | |
38 | OutputIterator2 first_false, | |
39 | UnaryPredicate predicate, | |
40 | command_queue &queue = system::default_queue()) | |
41 | { | |
42 | // copy true values | |
43 | OutputIterator1 last_true = | |
44 | ::boost::compute::copy_if(first, | |
45 | last, | |
46 | first_true, | |
47 | predicate, | |
48 | queue); | |
49 | ||
50 | // copy false values | |
51 | OutputIterator2 last_false = | |
52 | ::boost::compute::copy_if(first, | |
53 | last, | |
54 | first_false, | |
55 | not1(predicate), | |
56 | queue); | |
57 | ||
58 | // return iterators to the end of the true and the false ranges | |
59 | return std::make_pair(last_true, last_false); | |
60 | } | |
61 | ||
62 | } // end compute namespace | |
63 | } // end boost namespace | |
64 | ||
65 | #endif // BOOST_COMPUTE_ALGORITHM_PARTITION_COPY_HPP |