void copyCast(const std::complex<float>* in, std::complex<float>* out,
              int num_elements) {
  std::transform(in, in + num_elements, out,
                 [](std::complex<float> a) { return a; });
}
void copyCast(const std::complex<float>* in, std::complex<float>* out,
              int num_elements) {
  std::transform(in, in + num_elements, out,
                 [](std::complex<float> a) { return a; });
}