Function PreAlign

3rdparty/flatbuffers/include/flatbuffers/flatbuffers.h:817–819

Aligns such that when "len" bytes are written, an object can be written after it with "alignment" without padding.

  // Aligns such that when "len" bytes are written, an object can be written
  // after it with "alignment" without padding.
  void PreAlign(size_t len, size_t alignment) {
    buf_.fill(PaddingBytes(GetSize() + len, alignment));
  }
  template<typename T> void PreAlign(size_t len) {
    AssertScalarT<T>();
    PreAlign(len, sizeof(T));