/** The buffer content may be copied back on destruction to some
final location */
~buffer() {
/* If there is a final_data set and that points to something
alive, copy back the data through the shared pointer */
if (auto p = final_data.lock())
std::copy_n(access.data(), access.num_elements(), p.get());
/* If data are shared with the host but not concretely, we would
have to copy back the data to the host */
// else if (shared_data)
// std::copy_n(access.data(), access.num_elements(), shared_data.get());
}
void fill(boost::multi_array_ref<V1,NumDims> &x, const V2 &v) {
std::fill_n(x.data(), x.num_elements(), v);
}
template <typename T, size_t dim> static void fill (boost::multi_array_ref<T, dim>& array, const T& value) {
std::fill (array.data (), array.data () + array.num_elements (), value);
}