]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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_EXPERIMENTAL_SORT_BY_TRANSFORM_HPP | |
12 | #define BOOST_COMPUTE_EXPERIMENTAL_SORT_BY_TRANSFORM_HPP | |
13 | ||
14 | #include <iterator> | |
15 | ||
16 | #include <boost/compute/algorithm/sort_by_key.hpp> | |
17 | #include <boost/compute/algorithm/transform.hpp> | |
18 | #include <boost/compute/container/vector.hpp> | |
19 | #include <boost/compute/detail/iterator_range_size.hpp> | |
20 | #include <boost/compute/type_traits/result_of.hpp> | |
21 | ||
22 | namespace boost { | |
23 | namespace compute { | |
24 | namespace experimental { | |
25 | ||
26 | template<class Iterator, class Transform, class Compare> | |
27 | inline void sort_by_transform(Iterator first, | |
28 | Iterator last, | |
29 | Transform transform, | |
30 | Compare compare, | |
31 | command_queue &queue = system::default_queue()) | |
32 | { | |
33 | typedef typename std::iterator_traits<Iterator>::value_type value_type; | |
34 | typedef typename boost::compute::result_of<Transform(value_type)>::type key_type; | |
35 | ||
36 | size_t n = detail::iterator_range_size(first, last); | |
37 | if(n < 2){ | |
38 | return; | |
39 | } | |
40 | ||
41 | const context &context = queue.get_context(); | |
42 | ||
43 | ::boost::compute::vector<key_type> keys(n, context); | |
44 | ||
45 | ::boost::compute::transform( | |
46 | first, | |
47 | last, | |
48 | keys.begin(), | |
49 | transform, | |
50 | queue | |
51 | ); | |
52 | ||
53 | ::boost::compute::sort_by_key( | |
54 | keys.begin(), | |
55 | keys.end(), | |
56 | first, | |
57 | compare, | |
58 | queue | |
59 | ); | |
60 | } | |
61 | ||
62 | } // end experimental namespace | |
63 | } // end compute namespace | |
64 | } // end boost namespace | |
65 | ||
66 | #endif // BOOST_COMPUTE_EXPERIMENTAL_SORT_BY_TRANSFORM_HPP |