Function PushClearIfEmpty

src/io/dataset.cpp:1031–1044

template<typename T>
void PushClearIfEmpty(std::vector<T>* dest, const size_t dest_len, const std::vector<T>& src, const size_t src_len, const T& deflt) {
  if (!dest->empty() && !src.empty()) {
    PushVector(dest, src);
  } else if (!dest->empty() && src.empty()) {
    for (size_t i = 0; i < src_len; ++i) {
      dest->push_back(deflt);
    }
  } else if (dest->empty() && !src.empty()) {
    for (size_t i = 0; i < dest_len; ++i) {
      dest->push_back(deflt);
    }
    PushVector(dest, src);
  }
}

void Dataset::addFeaturesFrom(Dataset* other) {
  if (other->num_data_ != num_data_) {