random-code/garage.cpp at master · KillzoneKid/random-code · GitHub

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/*
Some sort of garage class allowing multiple car add
while only unique ids are accepted
https://ideone.com/8yUyHV
*/

#include<iostream>
#include<unordered_set>
#include<initializer_list>

classCar
{
private:
int id;

public:
Car(int id) : id(id) {};
intgetId() const { return id; }
};

structHash
{
	std::size_toperator()(Car const &car) const
	{
return std::hash<int>{}(car.getId());
	};
};

structEqual
{
booloperator()(Car const &car1, Car const &car2) const
	{
return car1.getId() == car2.getId();
	};
};

classGarage
{
private:
	std::unordered_set<Car, Hash, Equal> allcars;

public:
Garage() = default;

voidaddCars(std::initializer_list<Car> cars)
	{
for (auto car : cars)
 allcars.insert(car);
	}

friend std::ostream &operator<<(std::ostream &os, Garage const &garage)
	{
for (autoconst &car : garage.allcars)
 os << "Car id: " << car.getId() << std::endl;

return os;
	}
};

intmain()
{
	Garage garage;
	Car car4(4);

	std::cout << "adding 3 cars" << std::endl;
	garage.addCars({ 1,2,3,3,3,3,1,2,3 });
	std::cout << garage << std::endl;

	std::cout << "adding 1 more" << std::endl;
	garage.addCars({ car4, car4, car4 });
	std::cout << garage << std::endl;

return0;
}