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70 lines
2.1 KiB
C++
70 lines
2.1 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 TestGather
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#include <boost/test/unit_test.hpp>
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#include <boost/compute/system.hpp>
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#include <boost/compute/algorithm/copy_if.hpp>
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#include <boost/compute/algorithm/gather.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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namespace compute = boost::compute;
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BOOST_AUTO_TEST_CASE(gather_int)
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{
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int input_data[] = { 1, 2, 3, 4, 5 };
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compute::vector<int> input(5, context);
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compute::copy_n(input_data, 5, input.begin(), queue);
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int indices_data[] = { 0, 4, 1, 3, 2 };
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compute::vector<int> indices(5, context);
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compute::copy_n(indices_data, 5, indices.begin(), queue);
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compute::vector<int> output(5, context);
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compute::gather(
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indices.begin(), indices.end(), input.begin(), output.begin(), queue
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);
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CHECK_RANGE_EQUAL(int, 5, output, (1, 5, 2, 4, 3));
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}
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BOOST_AUTO_TEST_CASE(copy_index_then_gather)
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{
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// input data
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int data[] = { 1, 4, 3, 2, 5, 9, 8, 7 };
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compute::vector<int> input(8, context);
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compute::copy_n(data, 8, input.begin(), queue);
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// function returning true if the input is odd
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BOOST_COMPUTE_FUNCTION(bool, is_odd, (int),
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{
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return _1 % 2 != 0;
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});
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// copy indices of all odd values
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compute::vector<int> odds(5, context);
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compute::detail::copy_index_if(
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input.begin(), input.end(), odds.begin(), is_odd, queue
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);
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CHECK_RANGE_EQUAL(int, 5, odds, (0, 2, 4, 5, 7));
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// gather all odd values
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compute::vector<int> odd_values(5, context);
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compute::gather(
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odds.begin(), odds.end(), input.begin(), odd_values.begin(), queue
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);
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CHECK_RANGE_EQUAL(int, 5, odd_values, (1, 3, 5, 9, 7));
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}
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BOOST_AUTO_TEST_SUITE_END()
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