MultiIndex.hh

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#pragma once
 
#include <vector>
 
 
template<class T>
class MultiIndex {
    public:
        typedef std::vector<T> values_type;
        std::vector<values_type> values;
 
        void start()
            {
            current_pos=std::vector<std::size_t>(values.size(), 0);
            end_=false;
            }
 
        bool end() const
            {
            return end_;
            }
 
        MultiIndex& operator++()
            {
            current_pos[0]++;
            std::size_t ci=0;
            while(current_pos[ci] == values[ci].size()) {
                if(ci==current_pos.size()-1) {
                    end_=true;
                    return *this;
                    }
                current_pos[ci++]=0;
                current_pos[ci]++;
                }
            return *this;
            }
 
        const T& operator[](std::size_t i)
            {
            return values[i][current_pos[i]];
            }
 
    private:
        std::vector<std::size_t> current_pos;
        bool end_;
    };