Column accessor¶
The column_accessor class provides a read-only access to the column values
of the table as contiguous
homogeneous array.
Usage Example¶
#include <sycl/sycl.hpp>
#include <iostream>
#include "oneapi/dal/table/homogen.hpp"
#include "oneapi/dal/table/column_accessor.hpp"
using namespace oneapi;
int main() {
sycl::queue queue { sycl::default_selector() };
constexpr float host_data[] = {
1.0f, 1.5f, 2.0f,
2.1f, 3.2f, 3.7f,
4.0f, 4.9f, 5.0f,
5.2f, 6.1f, 6.2f
};
constexpr std::int64_t row_count = 4;
constexpr std::int64_t column_count = 3;
auto shared_data = sycl::malloc_shared<float>(row_count * column_count, queue);
auto event = queue.memcpy(shared_data, host_data, sizeof(float) * row_count * column_count);
auto t = dal::homogen_table::wrap(queue, shared_data, row_count, column_count, { event });
// Accessing whole elements in a first column
dal::column_accessor<const float> acc { t };
auto block = acc.pull(queue, 0);
for(std::int64_t i = 0; i < block.get_count(); i++) {
std::cout << block[i] << ", ";
}
std::cout << std::endl;
sycl::free(shared_data, queue);
return 0;
}
Programming interface¶
Refer to API Reference: Column accessor.