Method fixIter

include/hspp.h:473–484

            mCache.reset();
        }
        void fixIter()
        {
            while (!(mInnerIter != fetch().end()))
            {
                advanceBase();
                if (!hasValue())
                {
                    break;
                }
                mInnerIter = fetch().begin();
            }
        }

    public:
        constexpr Iter(JoinView const& view)