cpIter.hpp

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#pragma once
 
#include "indep/common.hpp"
#include "indep/macro.hpp"
 
namespace by {
    class _nout cpIter {
        BY(ME(cpIter))
 
    public:
        cpIter(const nchar* begin, const nchar* from);
 
        explicit cpIter(const std::string& from, nbool isReversed = false);
 
        cpIter(std::string&& from, nbool isReversed = false) = delete;
 
    public:
        me operator+(ncnt step);
        me& operator++();
        me operator++(int);
        me& operator+=(ncnt step);
        std::string operator*() const;
        explicit operator nbool() const;
        nbool operator==(const me& rhs) const;
 
    public:
        nbool isEnd() const;
        void rel();
 
        ncnt next(ncnt step);
 
        ncnt stepForward(ncnt step);
 
        ncnt stepBackward(ncnt step);
 
        std::string get() const;
        ncnt remainLen() const;
 
    private:
        ncnt _step(const std::function<const nchar*()>& closure, ncnt step);
        const nchar* _nextCodepoint(const nchar* from) const;
        const nchar* _prevCodepoint(const nchar* e) const;
        ncnt _skipBytes(nchar ch) const;
 
    private:
        const nchar* _begin;
        const nchar* _end;
        nbool _isReversed;
    };
} // namespace by