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701bc8a5f3
This adds an implementation of the nth_element() algorithm. For now the algorithm is trivially implemented by calling sort().
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
//---------------------------------------------------------------------------//
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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://kylelutz.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#define BOOST_TEST_MODULE TestNthElement
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#include <boost/test/unit_test.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/copy_n.hpp>
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#include <boost/compute/algorithm/nth_element.hpp>
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#include <boost/compute/container/vector.hpp>
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#include "check_macros.hpp"
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#include "context_setup.hpp"
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BOOST_AUTO_TEST_CASE(nth_element_int)
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{
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int data[] = { 9, 15, 1, 4, 9, 9, 4, 15, 12, 1 };
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boost::compute::vector<int> vector(10, context);
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boost::compute::copy_n(data, 10, vector.begin(), queue);
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boost::compute::nth_element(
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vector.begin(), vector.begin() + 5, vector.end(), queue
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);
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CHECK_RANGE_EQUAL(int, 5, vector, (1, 1, 4, 4, 9));
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boost::compute::nth_element(
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vector.begin(), vector.end(), vector.end(), queue
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);
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CHECK_RANGE_EQUAL(int, 10, vector, (1, 1, 4, 4, 9, 9, 9, 12, 15, 15));
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}
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BOOST_AUTO_TEST_CASE(nth_element_median)
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{
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int data[] = { 5, 6, 4, 3, 2, 6, 7, 9, 3 };
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boost::compute::vector<int> v(9, context);
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boost::compute::copy_n(data, 9, v.begin(), queue);
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boost::compute::nth_element(v.begin(), v.begin() + v.size()/2, v.end(), queue);
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boost::compute::copy_n(v.begin(), 9, data, queue);
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BOOST_CHECK_EQUAL(data[v.size()/2], 5);
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}
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BOOST_AUTO_TEST_SUITE_END()
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