90 lines
3.2 KiB
Plaintext
90 lines
3.2 KiB
Plaintext
//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_ALGORITHM_TRANSFORM_REDUCE_HPP
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#define BOOST_COMPUTE_ALGORITHM_TRANSFORM_REDUCE_HPP
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#include <boost/compute/system.hpp>
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#include <boost/compute/algorithm/reduce.hpp>
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#include <boost/compute/iterator/transform_iterator.hpp>
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#include <boost/compute/iterator/zip_iterator.hpp>
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#include <boost/compute/functional/detail/unpack.hpp>
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#include <boost/compute/detail/iterator_range_size.hpp>
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namespace boost {
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namespace compute {
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/// Transforms each value in the range [\p first, \p last) with the unary
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/// \p transform_function and then reduces each transformed value with
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/// \p reduce_function.
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///
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/// For example, to calculate the sum of the absolute values of a vector
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/// of integers:
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///
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/// \snippet test/test_transform_reduce.cpp sum_abs_int
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///
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/// \see reduce(), inner_product()
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template<class InputIterator,
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class OutputIterator,
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class UnaryTransformFunction,
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class BinaryReduceFunction>
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inline void transform_reduce(InputIterator first,
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InputIterator last,
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OutputIterator result,
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UnaryTransformFunction transform_function,
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BinaryReduceFunction reduce_function,
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command_queue &queue = system::default_queue())
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{
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::boost::compute::reduce(
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::boost::compute::make_transform_iterator(first, transform_function),
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::boost::compute::make_transform_iterator(last, transform_function),
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result,
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reduce_function,
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queue
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);
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}
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/// \overload
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template<class InputIterator1,
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class InputIterator2,
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class OutputIterator,
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class BinaryTransformFunction,
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class BinaryReduceFunction>
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inline void transform_reduce(InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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OutputIterator result,
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BinaryTransformFunction transform_function,
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BinaryReduceFunction reduce_function,
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command_queue &queue = system::default_queue())
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{
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typedef typename std::iterator_traits<InputIterator1>::difference_type difference_type;
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difference_type n = std::distance(first1, last1);
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::boost::compute::transform_reduce(
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::boost::compute::make_zip_iterator(
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boost::make_tuple(first1, first2)
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),
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::boost::compute::make_zip_iterator(
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boost::make_tuple(last1, first2 + n)
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),
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result,
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detail::unpack(transform_function),
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reduce_function,
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queue
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);
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_TRANSFORM_REDUCE_HPP
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