Zipper.hpp

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#pragma once
 
#include "ZipperIterator.hpp"
 
template <class... Containers>
class Zipper {
public:
    using iterator = ZipperIterator<Containers...>;
    using iterator_t = typename iterator::iterator_tuple;
 
    Zipper(Containers&... cs)
        : _begin(create_iterators(cs...)), _end(create_end_iterators(cs...)),
        _size(_compute_size(cs...)) {}
 
    iterator begin() {
        return iterator(_begin, _size);
    }
 
    iterator end() {
        return iterator(_end, _size, _size);
    }
 
private:
    static std::size_t _compute_size(Containers&... containers) {
        return std::min({containers.size()...});
    }
 
    static iterator_t create_iterators(Containers&... containers) {
        return iterator_t(containers.begin()...);
    }
 
    static iterator_t create_end_iterators(Containers&... containers) {
        return iterator_t(containers.end()...);
    }
 
private:
    iterator_t _begin; 
    iterator_t _end; 
    std::size_t _size; 
};