proto_sort

proto_sort.cpp

struct FieldNumberSorter {
  bool operator()(const FieldDescriptor* left,
                  const FieldDescriptor* right) const {
    // Sorting by tag order.
    return left->number() < right->number();
  }
};
void Reflection::ListFieldsMayFailOnStripped(
  const Message& message, bool should_fail,
  std::vector<const FieldDescriptor*>* output) const {
  // Traverse all fields in their order of declaration.
  for (int i = 0; i <= last_non_weak_field_index; i++) {
    const FieldDescriptor* field = descriptor_->field(i);
    if (FieldSize(message, field) > 0) {
      output->push_back(field);
    }
  }
  // Sort by their tag number
  std::sort(output->begin(), output->end(), FieldNumberSorter());
}