#include <memory>

class Item {
public:
    int k;
    Item(int k) : k{ k } {}
};

class Car {
public:
    Car(int type) {}
private:
    std::unique_ptr<Item> type{ new Item{5} };
};

class Human {
public:
    Car c{ 1 };
};

int main() {
    Human h;
    Car c2{ 2 };
    h.c = std::move(c2);
}