Method Iter

develop/include/range.h:487–495

    public:
        constexpr Iter(JoinView const& view)
        : mView{view}
        , mBaseIter{mView.get().mBase.begin()}
        , mCache{}
        // This can be invalid if base view is empty, but the compiler requires initialization of mInnerIter.
        , mInnerIter{fetch().begin()}
        {
            fixIter();
        }
        auto& operator++()
        {
            ++mInnerIter;