#include <iostream>
#include <memory>

class Triangle
{
    double a,b,c;
public:
    Triangle(double a,double b, double c)
    {
        this->a=a;
        this->b=b;
        this->c=c;
    }
    friend double perimeter(std::unique_ptr<Triangle> t);
    friend double perimeterRef(std::unique_ptr<Triangle> &t);
};

double perimeter(std::unique_ptr<Triangle> t)
{
    return t->a + t->b + t->c;
}
double perimeterRef(std::unique_ptr<Triangle> &t)
{
    return t->a + t->b + t->c;
}


int main()
{
    std::unique_ptr<Triangle> t=std::make_unique<Triangle>(3,4,5);
    std::cout<<perimeterRef(t)<<std::endl;
    std::cout<<(!t ? "nie": " ")<<"istnieje"<<std::endl;

    std::cout<<perimeter(move(t))<<std::endl;
    std::cout<<(!t ? " nie": " ")<<"istnieje"<<std::endl;

    return 0;
}