narrIteration.hpp

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class narrIteration: public iteration {
    BY(CLASS(narrIteration, iteration))
    friend class tnarr;
 
public:
    narrIteration(tnarr& own, nidx n, nbool isReversed):
        super(isReversed), _n(isReversed ? own.len() - 1 - n : n), _own(own) {}
 
    using super::operator*;
 
    T& operator*() override { return *get(); }
 
public:
    nbool isEnd() const override { return !_own.in(_n); }
 
    void rel() override { _n = this->isReversed() ? -1 : _own.len(); }
 
    ncnt stepForward(ncnt step) override {
        WHEN(step <= 0) .ret(0);
        WHEN(isEnd()) .ret(0);
        int len = _own.len();
        int toLast = len - 1 - _n;
 
        _n += step;
        if(_n >= len) {
            _n = len;
            step = toLast;
        }
        return step;
    }
 
    ncnt stepBackward(ncnt step) override {
        WHEN(step <= 0) .ret(0);
        WHEN(isEnd()) .ret(0);
        int toLast = _n;
 
        _n -= step;
        if(_n < 0) {
            _n = -1;
            step = toLast;
        }
        return step;
    }
 
    using super::get;
 
    T* get() override {
        WHEN(isEnd()) .ret(nullptr);
        return _own.get(_n);
    }
 
    using super::getContainer;
 
    tucontainable<T>* getContainer() override { return &_own; }
 
protected:
    nbool _onSame(const typeProvidable& rhs) const override {
        const me& cast = (const me&) rhs;
        return this->isFrom(cast.getContainer()) && _n == cast._n;
    }
 
private:
    nidx _n;
    tnarr& _own;
};