projects / ceph.git / blame
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| 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_ALGORITHM_TRANSFORM_HPP | |
| 12 | #define BOOST_COMPUTE_ALGORITHM_TRANSFORM_HPP | |
| 13 | ||
| 14 | #include <boost/compute/system.hpp> | |
| 15 | #include <boost/compute/command_queue.hpp> | |
| 16 | #include <boost/compute/algorithm/copy.hpp> | |
| 17 | #include <boost/compute/iterator/transform_iterator.hpp> | |
| 18 | #include <boost/compute/iterator/zip_iterator.hpp> | |
| 19 | #include <boost/compute/functional/detail/unpack.hpp> | |
| 20 | ||
| 21 | namespace boost { | |
| 22 | namespace compute { | |
| 23 | ||
| 24 | /// Transforms the elements in the range [\p first, \p last) using | |
| 25 | /// operator \p op and stores the results in the range beginning at | |
| 26 | /// \p result. | |
| 27 | /// | |
| 28 | /// For example, to calculate the absolute value for each element in a vector: | |
| 29 | /// | |
| 30 | /// \snippet test/test_transform.cpp transform_abs | |
| 31 | /// | |
| 32 | /// \see copy() | |
| 33 | template<class InputIterator, class OutputIterator, class UnaryOperator> | |
| 34 | inline OutputIterator transform(InputIterator first, | |
| 35 | InputIterator last, | |
| 36 | OutputIterator result, | |
| 37 | UnaryOperator op, | |
| 38 | command_queue &queue = system::default_queue()) | |
| 39 | { | |
| 40 | return copy( | |
| 41 | ::boost::compute::make_transform_iterator(first, op), | |
| 42 | ::boost::compute::make_transform_iterator(last, op), | |
| 43 | result, | |
| 44 | queue | |
| 45 | ); | |
| 46 | } | |
| 47 | ||
| 48 | /// \overload | |
| 49 | template<class InputIterator1, | |
| 50 | class InputIterator2, | |
| 51 | class OutputIterator, | |
| 52 | class BinaryOperator> | |
| 53 | inline OutputIterator transform(InputIterator1 first1, | |
| 54 | InputIterator1 last1, | |
| 55 | InputIterator2 first2, | |
| 56 | OutputIterator result, | |
| 57 | BinaryOperator op, | |
| 58 | command_queue &queue = system::default_queue()) | |
| 59 | { | |
| 60 | typedef typename std::iterator_traits<InputIterator1>::difference_type difference_type; | |
| 61 | ||
| 62 | difference_type n = std::distance(first1, last1); | |
| 63 | ||
| 64 | return transform( | |
| 65 | make_zip_iterator(boost::make_tuple(first1, first2)), | |
| 66 | make_zip_iterator(boost::make_tuple(last1, first2 + n)), | |
| 67 | result, | |
| 68 | detail::unpack(op), | |
| 69 | queue | |
| 70 | ); | |
| 71 | } | |
| 72 | ||
| 73 | } // end compute namespace | |
| 74 | } // end boost namespace | |
| 75 | ||
| 76 | #endif // BOOST_COMPUTE_ALGORITHM_TRANSFORM_HPP |