gistfile1.txt

#include <iostream>

struct Cell {};
struct DGGS {
    virtual void children(Cell *c) = 0;
    virtual Cell *child() = 0;
};

struct QuadCell: public Cell {
};

struct DGGS1 : public DGGS {
    void children(QuadCell *c) {
        std::cout << "Y.QuadCell!" << std::endl;
    }
    Cell *child() override {
        return QuadCell{};
    }

};
int main() {
    DGGS *d = new DGGS1();
    Cell *c = d->child();
    d->children(c);


}