C++ (Cpp) command_queue::enqueue_read_buffer_async Examples

Example #1

File: copy_to_host.hpp Project: BeauJoh/compute

inline future<HostIterator> copy_to_host_async(DeviceIterator first,
                                               DeviceIterator last,
                                               HostIterator result,
                                               command_queue &queue)
{
    typedef typename
        std::iterator_traits<DeviceIterator>::value_type
        value_type;

    size_t count = iterator_range_size(first, last);
    if(count == 0){
        return future<HostIterator>();
    }

    const buffer &buffer = first.get_buffer();
    size_t offset = first.get_index();

    event event_ =
        queue.enqueue_read_buffer_async(buffer,
                                        offset * sizeof(value_type),
                                        count * sizeof(value_type),
                                        ::boost::addressof(*result));

    return make_future(iterator_plus_distance(result, count), event_);
}