#include <iostream>
#include <memory>

using namespace std;

class Table {
public:
    virtual void show() = 0;
};

class ATable : public Table {
public:
    virtual void show() {
        cout << "Atable" << endl;
    }
};

class Chair {
public:
    virtual void show() = 0;
};

class AChair : public Chair {
public:
    virtual void show() {
        cout << "Achair" << endl;
    }
};


class FurnitureFactory {
public:
    virtual unique_ptr<Chair> build_chair() = 0;
    virtual unique_ptr<Table> build_table() = 0;
};

// A concrete Factury will create the same style of objects.
class AFurnitureFactory : public FurnitureFactory {
public:
    virtual unique_ptr<Chair> build_chair() override {
        return make_unique<AChair>();
    }

    virtual unique_ptr<Table> build_table() override {
        return make_unique<ATable>();
    }
};

// Client code, which don't need to care the style of furniture.
void operate(FurnitureFactory* ff) {
    unique_ptr<Chair> c = ff->build_chair();
    unique_ptr<Table> t = ff->build_table();
    c->show();
    t->show();
}


int main() {
    AFurnitureFactory a;
    // Of course you can extend BFF, CFF
    operate(&a);
}