ProductItr.h

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/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRIGCOMPOSITEUTILS_PRODUCTITR_H
#define TRIGCOMPOSITEUTILS_PRODUCTITR_H
 
#include <functional>
#include <iterator>
#include <type_traits>
#include <vector>
 
namespace TrigCompositeUtils {
    template <typename Iterator>
    class ProductItr {
    public:
        using iterator_category = std::input_iterator_tag;
        using value_type = std::vector<Iterator>;
        using reference = const value_type &;
        using pointer = const value_type *;
        using difference_type = std::ptrdiff_t;

        ProductItr() = default;

        ProductItr(const std::vector<Iterator> &itrs, const std::vector<Iterator> &endItrs);

        std::size_t nItrs() const { return m_startItrs.size(); }

        void reset();

        bool exhausted() const;

        reference operator*() const;
        pointer operator->() const;

        ProductItr &operator++();

        ProductItr operator++(int);

        bool operator==(const ProductItr &other) const;
        bool operator!=(const ProductItr &other) const;
 
    private:
        std::vector<Iterator> m_startItrs;
        std::vector<Iterator> m_endItrs;
        std::vector<Iterator> m_currentItrs;
 
    }; //> end class ProductItr<Iterator>
} // namespace TrigCompositeUtils
 
#include "TrigCompositeUtils/ProductItr.icc"
 
#endif //> !TRIGCOMPOSITEUTILS_PRODUCT_ITR_H