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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@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.
- //---------------------------------------------------------------------------//
- #define BOOST_TEST_MODULE TestGather
- #include <boost/test/unit_test.hpp>
- #include <boost/compute/system.hpp>
- #include <boost/compute/algorithm/copy_if.hpp>
- #include <boost/compute/algorithm/gather.hpp>
- #include <boost/compute/container/vector.hpp>
- #include "check_macros.hpp"
- #include "context_setup.hpp"
- namespace compute = boost::compute;
- BOOST_AUTO_TEST_CASE(gather_int)
- {
- int input_data[] = { 1, 2, 3, 4, 5 };
- compute::vector<int> input(input_data, input_data + 5, queue);
- int indices_data[] = { 0, 4, 1, 3, 2 };
- compute::vector<int> indices(indices_data, indices_data + 5, queue);
- compute::vector<int> output(5, context);
- compute::gather(
- indices.begin(), indices.end(), input.begin(), output.begin(), queue
- );
- CHECK_RANGE_EQUAL(int, 5, output, (1, 5, 2, 4, 3));
- compute::gather(
- indices.begin() + 1, indices.end(), input.begin(), output.begin(), queue
- );
- CHECK_RANGE_EQUAL(int, 5, output, (5, 2, 4, 3, 3));
- }
- BOOST_AUTO_TEST_CASE(copy_index_then_gather)
- {
- // input data
- int data[] = { 1, 4, 3, 2, 5, 9, 8, 7 };
- compute::vector<int> input(data, data + 8, queue);
- // function returning true if the input is odd
- BOOST_COMPUTE_FUNCTION(bool, is_odd, (int x),
- {
- return x % 2 != 0;
- });
- // copy indices of all odd values
- compute::vector<int> odds(5, context);
- compute::detail::copy_index_if(
- input.begin(), input.end(), odds.begin(), is_odd, queue
- );
- CHECK_RANGE_EQUAL(int, 5, odds, (0, 2, 4, 5, 7));
- // gather all odd values
- compute::vector<int> odd_values(5, context);
- compute::gather(
- odds.begin(), odds.end(), input.begin(), odd_values.begin(), queue
- );
- CHECK_RANGE_EQUAL(int, 5, odd_values, (1, 3, 5, 9, 7));
- }
- BOOST_AUTO_TEST_SUITE_END()
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