Method AtEnd

test/gtest/gtest.h:14672–14683

            *current4_, *current5_, *current6_, *current7_);
    }
    bool AtEnd() const {
      // We must report iterator past the end of the range when either of the
      // component iterators has reached the end of its range.
      return
          current1_ == end1_ ||
          current2_ == end2_ ||
          current3_ == end3_ ||
          current4_ == end4_ ||
          current5_ == end5_ ||
          current6_ == end6_ ||
          current7_ == end7_;
    }

    // No implementation - assignment is unsupported.
    void operator=(const Iterator& other);