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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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