//---------------------------------------------------------------------------//
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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_DETAIL_SERIAL_COUNT_IF_HPP
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#define BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_COUNT_IF_HPP
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#include <iterator>
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#include <boost/compute/container/detail/scalar.hpp>
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#include <boost/compute/detail/meta_kernel.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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namespace detail {
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// counts values that match the predicate using a single thread
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template<class InputIterator, class Predicate>
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inline size_t serial_count_if(InputIterator first,
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InputIterator last,
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Predicate predicate,
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command_queue &queue)
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{
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typedef typename std::iterator_traits<InputIterator>::value_type value_type;
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const context &context = queue.get_context();
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size_t size = iterator_range_size(first, last);
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meta_kernel k("serial_count_if");
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k.add_set_arg("size", static_cast<uint_>(size));
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size_t result_arg = k.add_arg<uint_ *>(memory_object::global_memory, "result");
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k <<
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"uint count = 0;\n" <<
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"for(uint i = 0; i < size; i++){\n" <<
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k.decl<const value_type>("value") << "="
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<< first[k.var<uint_>("i")] << ";\n" <<
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"if(" << predicate(k.var<const value_type>("value")) << "){\n" <<
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"count++;\n" <<
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"}\n"
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"}\n"
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"*result = count;\n";
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kernel kernel = k.compile(context);
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// setup result buffer
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scalar<uint_> result(context);
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kernel.set_arg(result_arg, result.get_buffer());
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// run kernel
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queue.enqueue_task(kernel);
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// read index
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return result.read(queue);
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}
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} // end detail namespace
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_COUNT_IF_HPP
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