Method AppendToString

src/butil/strings/string_piece.h:298–300

  }

  void AppendToString(STRING_TYPE* target) const {
    internal::AppendToString(*this, target);
  }

  size_type copy(value_type* buf, size_type n, size_type pos = 0) const {
    return internal::copy(*this, buf, n, pos);