FM / algorithm

/usr/include/boost/compute/algorithm

Name	Size	Mode	Actions
detail/	-	0755	rm
accumulate.hpp	6375	0644	edit dl rm
adjacent_difference.hpp	4416	0644	edit dl rm
adjacent_find.hpp	5313	0644	edit dl rm
all_of.hpp	1427	0644	edit dl rm
any_of.hpp	1544	0644	edit dl rm
binary_search.hpp	1480	0644	edit dl rm
copy.hpp	31483	0644	edit dl rm
copy_if.hpp	2574	0644	edit dl rm
copy_n.hpp	1940	0644	edit dl rm
count.hpp	2103	0644	edit dl rm
count_if.hpp	2388	0644	edit dl rm
equal.hpp	2209	0644	edit dl rm
equal_range.hpp	1636	0644	edit dl rm
exclusive_scan.hpp	4042	0644	edit dl rm
fill.hpp	10030	0644	edit dl rm
fill_n.hpp	1367	0644	edit dl rm
find.hpp	2004	0644	edit dl rm
find_end.hpp	4772	0644	edit dl rm
find_if.hpp	1504	0644	edit dl rm
find_if_not.hpp	1652	0644	edit dl rm
for_each.hpp	2131	0644	edit dl rm
for_each_n.hpp	1423	0644	edit dl rm
gather.hpp	2796	0644	edit dl rm
generate.hpp	1903	0644	edit dl rm
generate_n.hpp	1277	0644	edit dl rm
includes.hpp	5615	0644	edit dl rm
inclusive_scan.hpp	3402	0644	edit dl rm
inner_product.hpp	3849	0644	edit dl rm
inplace_merge.hpp	2047	0644	edit dl rm
iota.hpp	1735	0644	edit dl rm
is_partitioned.hpp	1785	0644	edit dl rm
is_permutation.hpp	2744	0644	edit dl rm
is_sorted.hpp	2436	0644	edit dl rm
lexicographical_compare.hpp	4950	0644	edit dl rm
lower_bound.hpp	1573	0644	edit dl rm
max_element.hpp	2781	0644	edit dl rm
merge.hpp	5037	0644	edit dl rm
minmax_element.hpp	2668	0644	edit dl rm
min_element.hpp	2780	0644	edit dl rm
mismatch.hpp	3409	0644	edit dl rm
next_permutation.hpp	5703	0644	edit dl rm
none_of.hpp	1426	0644	edit dl rm
nth_element.hpp	2868	0644	edit dl rm
partial_sum.hpp	1676	0644	edit dl rm
partition.hpp	1523	0644	edit dl rm
partition_copy.hpp	2592	0644	edit dl rm
partition_point.hpp	1858	0644	edit dl rm
prev_permutation.hpp	5695	0644	edit dl rm
random_shuffle.hpp	3010	0644	edit dl rm
reduce.hpp	11454	0644	edit dl rm
reduce_by_key.hpp	5933	0644	edit dl rm
remove.hpp	2002	0644	edit dl rm
remove_if.hpp	1850	0644	edit dl rm
replace.hpp	2588	0644	edit dl rm
replace_copy.hpp	2230	0644	edit dl rm
reverse.hpp	2438	0644	edit dl rm
reverse_copy.hpp	2678	0644	edit dl rm
rotate.hpp	1813	0644	edit dl rm
rotate_copy.hpp	1529	0644	edit dl rm
scatter.hpp	3435	0644	edit dl rm
scatter_if.hpp	4730	0644	edit dl rm
search.hpp	2967	0644	edit dl rm
search_n.hpp	4428	0644	edit dl rm
set_difference.hpp	6941	0644	edit dl rm
set_intersection.hpp	6646	0644	edit dl rm
set_symmetric_difference.hpp	7533	0644	edit dl rm
set_union.hpp	7384	0644	edit dl rm
sort.hpp	6569	0644	edit dl rm
sort_by_key.hpp	6156	0644	edit dl rm
stable_partition.hpp	2737	0644	edit dl rm
stable_sort.hpp	3809	0644	edit dl rm
stable_sort_by_key.hpp	6071	0644	edit dl rm
swap_ranges.hpp	1870	0644	edit dl rm
transform.hpp	3252	0644	edit dl rm
transform_if.hpp	4737	0644	edit dl rm
transform_reduce.hpp	3683	0644	edit dl rm
unique.hpp	2565	0644	edit dl rm
unique_copy.hpp	6429	0644	edit dl rm
upper_bound.hpp	1561	0644	edit dl rm

Edit: /usr/include/boost/compute/algorithm/search_n.hpp (4428B)

//---------------------------------------------------------------------------//
// Copyright (c) 2014 Roshan <thisisroshansmail@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_SEARCH_N_HPP
#define BOOST_COMPUTE_ALGORITHM_DETAIL_SEARCH_N_HPP

#include <iterator>

#include <boost/static_assert.hpp>

#include <boost/compute/algorithm/find.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/detail/iterator_range_size.hpp>
#include <boost/compute/detail/meta_kernel.hpp>
#include <boost/compute/system.hpp>
#include <boost/compute/type_traits/is_device_iterator.hpp>

namespace boost {
namespace compute {
namespace detail {

///
/// \brief Search kernel class
///
/// Subclass of meta_kernel which is capable of performing search_n
///
template<class TextIterator, class OutputIterator>
class search_n_kernel : public meta_kernel
{
public:
    typedef typename std::iterator_traits<TextIterator>::value_type value_type;

search_n_kernel() : meta_kernel("search_n")
    {}

void set_range(TextIterator t_first,
                   TextIterator t_last,
                   value_type value,
                   size_t n,
                   OutputIterator result)
    {
        m_n = n;
        m_n_arg = add_arg<uint_>("n");

m_value = value;
        m_value_arg = add_arg<value_type>("value");

m_count = iterator_range_size(t_first, t_last);
        m_count = m_count + 1 - m_n;

*this <<
            "uint i = get_global_id(0);\n" <<
            "uint i1 = i;\n" <<
            "uint j;\n" <<
            "for(j = 0; j<n; j++,i++)\n" <<
            "{\n" <<
            "   if(value != " << t_first[expr<uint_>("i")] << ")\n" <<
            "       j = n + 1;\n" <<
            "}\n" <<
            "if(j == n)\n" <<
            result[expr<uint_>("i1")] << " = 1;\n" <<
            "else\n" <<
            result[expr<uint_>("i1")] << " = 0;\n";
    }

event exec(command_queue &queue)
    {
        if(m_count == 0) {
            return event();
        }

set_arg(m_n_arg, uint_(m_n));
        set_arg(m_value_arg, m_value);

return exec_1d(queue, 0, m_count);
    }

private:
    size_t m_n;
    size_t m_n_arg;
    size_t m_count;
    value_type m_value;
    size_t m_value_arg;
};

} //end detail namespace

///
/// \brief Substring matching algorithm
///
/// Searches for the first occurrence of n consecutive occurrences of
/// value in text [t_first, t_last).
/// \return Iterator pointing to beginning of first occurrence
///
/// \param t_first Iterator pointing to start of text
/// \param t_last Iterator pointing to end of text
/// \param n Number of times value repeats
/// \param value Value which repeats
/// \param queue Queue on which to execute
///
/// Space complexity: \Omega(distance(\p t_first, \p t_last))
template<class TextIterator, class ValueType>
inline TextIterator search_n(TextIterator t_first,
                             TextIterator t_last,
                             size_t n,
                             ValueType value,
                             command_queue &queue = system::default_queue())
{
    BOOST_STATIC_ASSERT(is_device_iterator<TextIterator>::value);

// there is no need to check if pattern starts at last n - 1 indices
    vector<uint_> matching_indices(
        detail::iterator_range_size(t_first, t_last) + 1 - n,
        queue.get_context()
    );

// search_n_kernel puts value 1 at every index in vector where pattern
    // of n values starts at
    detail::search_n_kernel<TextIterator,
                            vector<uint_>::iterator> kernel;

kernel.set_range(t_first, t_last, value, n, matching_indices.begin());
    kernel.exec(queue);

vector<uint_>::iterator index = ::boost::compute::find(
        matching_indices.begin(), matching_indices.end(), uint_(1), queue
    );

// pattern was not found
    if(index == matching_indices.end())
        return t_last;

return t_first + detail::iterator_range_size(matching_indices.begin(), index);
}

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

#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SEARCH_N_HPP

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