34     struct IteratorImpl : public std::iterator <  struct
42         using traits = std::iterator_traits<IteratorImpl>;  argument
50         IteratorImpl(map_iter i) : mIter(i) {}  in IteratorImpl()  argument
52         inline IteratorImpl &operator++()    {
56         inline IteratorImpl  operator++(int) {
57             IteratorImpl i = *this;  argument
61         inline IteratorImpl &operator--()    {
65         inline IteratorImpl  operator--(int) {
66             IteratorImpl i = *this;  argument
72         inline bool operator==(const IteratorImpl &rhs) const { return mIter == rhs.mIter; }
73         inline bool operator!=(const IteratorImpl &rhs) const { return mIter != rhs.mIter; }
79     using ValueIterator = IteratorImpl<false>;
80     using ConstValueIterator = IteratorImpl<true>;
87         IteratorImpl<is_const> begin() const {  in begin()
88             return IteratorImpl<is_const>(mMap.begin());  in begin()
91         IteratorImpl<is_const> end() const {  in end()
92             return IteratorImpl<is_const>(mMap.end());  in end()