py::list print_recarray(py::array_t<S, 0> arr) {
const auto req = arr.request();
const auto ptr = static_cast<S*>(req.ptr);
auto l = py::list();
for (size_t i = 0; i < req.size; i++) {
std::stringstream ss;
ss << ptr[i];
l.append(py::str(ss.str()));
}
return l;
}
// Passing in an array of doubles
void twice(py::array_t<double> xs) {
py::buffer_info info = xs.request();
auto ptr = static_cast<double *>(info.ptr);
printf("ndim = %d\n", info.ndim);
printf("itemsize = %d\n", info.itemsize);
printf("shape:\n");
for(int i = 0; i < info.shape.size(); i++)
printf("%d\n", info.shape[i]);
printf("strides:\n");
for(int i = 0; i < info.strides.size(); i++)
printf("%d\n", info.strides[i]);
int n = 1;
for (auto r: info.shape) {
n *= r;
}
for (int i = 0; i <n; i++) {
*ptr++ *= 2;
}
}