Function StartVector

native/thirdpart/flatbuffers/flatbuffers.h:1672–1677

  }

  void StartVector(size_t len, size_t elemsize) {
    NotNested();
    nested = true;
    PreAlign<uoffset_t>(len * elemsize);
    PreAlign(len * elemsize, elemsize);  // Just in case elemsize > uoffset_t.
  }

  // Call this right before StartVector/CreateVector if you want to force the
  // alignment to be something different than what the element size would