Function StrAppend

be/src/gutil/strings/strcat.cc:182–185

    DCHECK_GT(uintptr_t((src).data() - (dest).data()), uintptr_t((dest).size()))

void StrAppend(string *result, const AlphaNum &a) {
  DCHECK_NO_OVERLAP(*result, a);
  result->append(a.data(), a.size());
}

void StrAppend(string *result, const AlphaNum &a, const AlphaNum &b) {
  DCHECK_NO_OVERLAP(*result, a);