Function clear_allocator

native/thirdpart/flatbuffers/flatbuffers.h:947–951

  void clear_scratch() { scratch_ = buf_; }

  void clear_allocator() {
    if (own_allocator_ && allocator_) { delete allocator_; }
    allocator_ = nullptr;
    own_allocator_ = false;
  }

  void clear_buffer() {
    if (buf_) Deallocate(allocator_, buf_, reserved_);