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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013-2014 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.
- //---------------------------------------------------------------------------//
- #include <iostream>
- #include <vector>
- #include <boost/compute/system.hpp>
- #include <boost/compute/algorithm/reduce.hpp>
- #include <boost/compute/container/mapped_view.hpp>
- namespace compute = boost::compute;
- // this example demonstrates how to use the mapped_view class to map
- // an array of numbers to device memory and use the reduce() algorithm
- // to calculate the sum.
- int main()
- {
- // get default device and setup context
- compute::device gpu = compute::system::default_device();
- compute::context context(gpu);
- compute::command_queue queue(context, gpu);
- std::cout << "device: " << gpu.name() << std::endl;
- // create data on host
- int data[] = { 4, 2, 3, 7, 8, 9, 1, 6 };
- // create mapped view on device
- compute::mapped_view<int> view(data, 8, context);
- // use reduce() to calculate sum on the device
- int sum = 0;
- compute::reduce(view.begin(), view.end(), &sum, queue);
- // print the sum on the host
- std::cout << "sum: " << sum << std::endl;
- return 0;
- }
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