iter.h

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/*
Copyright (c) 2026 MrXie1109
 
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*/
 
#pragma once
#include <iterator>
#include <type_traits>
#include <utility>
 
namespace console {
    template <class Iter>
    struct IteratorPair : public std::pair<Iter, Iter> {
        IteratorPair(Iter beg, Iter end) : std::pair<Iter, Iter>(beg, end) {}
 
        typedef Iter iterator; 
        using value_type =
            typename std::iterator_traits<Iter>::value_type; 
        using reference =
            typename std::iterator_traits<Iter>::reference; 
        using pointer =
            typename std::iterator_traits<Iter>::pointer; 

        iterator begin() { return this->first; }
        iterator end() { return this->second; }
    };

    template <class Iter>
    IteratorPair<Iter> iterpair(Iter beg, Iter end) {
        return {beg, end};
    }

    template <class It1, class It2>
    class TiedIterators {
        It1 it1; 
        It2 it2; 
 
    public:
        typedef std::pair<typename std::iterator_traits<It1>::value_type,
            typename std::iterator_traits<It2>::value_type>
                     value_type; 
        typedef void pointer;    
        typedef std::pair<typename std::iterator_traits<It1>::reference,
            typename std::iterator_traits<It2>::reference>
                                          reference;         
        typedef std::forward_iterator_tag iterator_category; 
        typedef std::ptrdiff_t            difference_type;   

        TiedIterators(It1 i1, It2 i2) : it1(i1), it2(i2) {}

        TiedIterators &operator++() {
            ++it1;
            ++it2;
            return *this;
        }

        reference operator*() const { return {*it1, *it2}; }

        bool operator==(const TiedIterators &other) const {
            return it1 == other.it1 || it2 == other.it2;
        }

        bool operator!=(const TiedIterators &other) const {
            return !(*this == other);
        }
    };

    template <class C1, class C2>
    IteratorPair<TiedIterators<typename C1::iterator, typename C2::iterator>>
    zip(C1 &c1, C2 &c2) {
        return {{std::begin(c1), std::begin(c2)}, {std::end(c1), std::end(c2)}};
    }

    template <class C1, class C2>
    IteratorPair<
        TiedIterators<typename C1::const_iterator, typename C2::const_iterator>>
    zip(const C1 &c1, const C2 &c2) {
        return {{std::begin(c1), std::begin(c2)}, {std::end(c1), std::end(c2)}};
    }

    template <class C1, class C2>
    IteratorPair<
        TiedIterators<typename C1::const_iterator, typename C2::iterator>>
    zip(const C1 &c1, C2 &c2) {
        return {{std::begin(c1), std::begin(c2)}, {std::end(c1), std::end(c2)}};
    }

    template <class C1, class C2>
    IteratorPair<
        TiedIterators<typename C1::iterator, typename C2::const_iterator>>
    zip(C1 &c1, const C2 &c2) {
        return {{std::begin(c1), std::begin(c2)}, {std::end(c1), std::end(c2)}};
    }
}