//---------------------------------------------------------------------------//
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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_COUNT_IF_HPP
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#define BOOST_COMPUTE_ALGORITHM_COUNT_IF_HPP
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#include <boost/static_assert.hpp>
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#include <boost/compute/device.hpp>
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#include <boost/compute/system.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/detail/count_if_with_ballot.hpp>
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#include <boost/compute/algorithm/detail/count_if_with_reduce.hpp>
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#include <boost/compute/algorithm/detail/count_if_with_threads.hpp>
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#include <boost/compute/algorithm/detail/serial_count_if.hpp>
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#include <boost/compute/detail/iterator_range_size.hpp>
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#include <boost/compute/type_traits/is_device_iterator.hpp>
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namespace boost {
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namespace compute {
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/// Returns the number of elements in the range [\p first, \p last)
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/// for which \p predicate returns \c true.
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///
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/// Space complexity on CPUs: \Omega(1)<br>
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/// Space complexity on GPUs: \Omega(n)
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template<class InputIterator, class Predicate>
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inline size_t count_if(InputIterator first,
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InputIterator last,
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Predicate predicate,
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command_queue &queue = system::default_queue())
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{
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BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
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const device &device = queue.get_device();
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size_t input_size = detail::iterator_range_size(first, last);
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if(input_size == 0){
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return 0;
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}
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if(device.type() & device::cpu){
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if(input_size < 1024){
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return detail::serial_count_if(first, last, predicate, queue);
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}
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else {
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return detail::count_if_with_threads(first, last, predicate, queue);
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}
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}
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else {
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if(input_size < 32){
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return detail::serial_count_if(first, last, predicate, queue);
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}
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else {
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return detail::count_if_with_reduce(first, last, predicate, queue);
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}
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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_COUNT_IF_HPP
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