Method increment

cachelib/common/tests/IteratorsTests.cpp:28–28

    : IteratorFacade<IntArrayIterator, int const, std::forward_iterator_tag> {
  explicit IntArrayIterator(int const* a) : a_(a) {}
  void increment() { ++a_; }
  int const& dereference() const { return *a_; }
  bool equal(IntArrayIterator const& rhs) const { return rhs.a_ == a_; }
  int const* a_;