Function AddStruct

native/thirdpart/flatbuffers/flatbuffers.h:1397–1402

  }

  template<typename T> void AddStruct(voffset_t field, const T *structptr) {
    if (!structptr) return;  // Default, don't store.
    Align(AlignOf<T>());
    buf_.push_small(*structptr);
    TrackField(field, GetSize());
  }

  void AddStructOffset(voffset_t field, uoffset_t off) {
    TrackField(field, off);