FM / detail

/usr/include/boost/compute/algorithm/detail/

/usr/include/boost/compute/algorithm/detail

Name	Size	Mode	Actions
balanced_path.hpp	6267	0644	edit dl rm
binary_find.hpp	4626	0644	edit dl rm
compact.hpp	2188	0644	edit dl rm
copy_on_device.hpp	7382	0644	edit dl rm
copy_to_device.hpp	6731	0644	edit dl rm
copy_to_host.hpp	6658	0644	edit dl rm
count_if_with_ballot.hpp	2605	0644	edit dl rm
count_if_with_reduce.hpp	2648	0644	edit dl rm
count_if_with_threads.hpp	4241	0644	edit dl rm
find_extrema.hpp	2441	0644	edit dl rm
find_extrema_on_cpu.hpp	5333	0644	edit dl rm
find_extrema_with_atomics.hpp	4251	0644	edit dl rm
find_extrema_with_reduce.hpp	18672	0644	edit dl rm
find_if_with_atomics.hpp	8509	0644	edit dl rm
inplace_reduce.hpp	4839	0644	edit dl rm
insertion_sort.hpp	6030	0644	edit dl rm
merge_path.hpp	3874	0644	edit dl rm
merge_sort_on_cpu.hpp	14654	0644	edit dl rm
merge_sort_on_gpu.hpp	22093	0644	edit dl rm
merge_with_merge_path.hpp	7339	0644	edit dl rm
radix_sort.hpp	15502	0644	edit dl rm
random_fill.hpp	1880	0644	edit dl rm
reduce_by_key.hpp	5243	0644	edit dl rm
reduce_by_key_with_scan.hpp	23735	0644	edit dl rm
reduce_on_cpu.hpp	3949	0644	edit dl rm
reduce_on_gpu.hpp	10391	0644	edit dl rm
scan.hpp	1545	0644	edit dl rm
scan_on_cpu.hpp	7056	0644	edit dl rm
scan_on_gpu.hpp	11320	0644	edit dl rm
search_all.hpp	2579	0644	edit dl rm
serial_accumulate.hpp	1990	0644	edit dl rm
serial_count_if.hpp	2243	0644	edit dl rm
serial_find_extrema.hpp	3151	0644	edit dl rm
serial_merge.hpp	3504	0644	edit dl rm
serial_reduce.hpp	2145	0644	edit dl rm
serial_reduce_by_key.hpp	4240	0644	edit dl rm
serial_scan.hpp	3184	0644	edit dl rm

Edit: /usr/include/boost/compute/algorithm/detail/count_if_with_reduce.hpp (2648B)

//---------------------------------------------------------------------------//
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//

#ifndef BOOST_COMPUTE_ALGORITHM_DETAIL_COUNT_IF_WITH_REDUCE_HPP
#define BOOST_COMPUTE_ALGORITHM_DETAIL_COUNT_IF_WITH_REDUCE_HPP

#include <boost/compute/algorithm/reduce.hpp>
#include <boost/compute/iterator/transform_iterator.hpp>
#include <boost/compute/types/fundamental.hpp>

namespace boost {
namespace compute {
namespace detail {

template<class Predicate, class Arg>
struct invoked_countable_predicate
{
    invoked_countable_predicate(Predicate p, Arg a)
        : predicate(p), arg(a)
    {
    }

Predicate predicate;
    Arg arg;
};

template<class Predicate, class Arg>
inline meta_kernel& operator<<(meta_kernel &kernel,
                               const invoked_countable_predicate<Predicate, Arg> &expr)
{
    return kernel << "(" << expr.predicate(expr.arg) << " ? 1 : 0)";
}

// the countable_predicate wraps Predicate and converts its result from
// bool to ulong so that it can be used with reduce()
template<class Predicate>
struct countable_predicate
{
    typedef ulong_ result_type;

countable_predicate(Predicate predicate)
        : m_predicate(predicate)
    {
    }

template<class Arg>
    invoked_countable_predicate<Predicate, Arg> operator()(const Arg &arg) const
    {
        return invoked_countable_predicate<Predicate, Arg>(m_predicate, arg);
    }

Predicate m_predicate;
};

// counts the number of elements matching predicate using reduce()
template<class InputIterator, class Predicate>
inline size_t count_if_with_reduce(InputIterator first,
                                   InputIterator last,
                                   Predicate predicate,
                                   command_queue &queue)
{
    countable_predicate<Predicate> reduce_predicate(predicate);

ulong_ count = 0;
    ::boost::compute::reduce(
        ::boost::compute::make_transform_iterator(first, reduce_predicate),
        ::boost::compute::make_transform_iterator(last, reduce_predicate),
        &count,
        ::boost::compute::plus<ulong_>(),
        queue
    );

return static_cast<size_t>(count);
}

} // end detail namespace
} // end compute namespace
} // end boost namespace

#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_COUNT_IF_WITH_REDUCE_HPP

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