Function WriteInto

src/butil/strings/string_util.h:460–466

// to this function (probably 0).
template <class string_type>
inline typename string_type::value_type* WriteInto(string_type* str,
                                                   size_t length_with_null) {
  DCHECK_GT(length_with_null, 1u);
  str->reserve(length_with_null);
  str->resize(length_with_null - 1);
  return &((*str)[0]);
}

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