Method next

tests/utils/lists.cpp:229–242

    }
    
    bool next() override {

        // stop when sublist generator is exhausted
        if (!subGen.next())
            return false;

        // else, obtain the next (sublist) sequence
        vector<int> combined = subGen.get();
        vector<int> sublist1 = getSublist(combined, 0, sublen1);
        vector<int> sublist2 = getSublist(combined, sublen1, sublen2);

        sublists = {sublist1, sublist2};
        return true;
    }
};