//main.cpp
    std::vector <bullet> bullets;

    bullets.push_back(bullet(true, 25.0, sf::Vector2f(30, 40)));
    bullets.push_back(bullet(false, 30.0, sf::Vector2f(0, 0)));
    bullets.push_back(bullet(false, 31.0, sf::Vector2f(20, 0)));

    std::cout << "Skończyłem tworzyć obiekty.\n";

    bullets.erase(bullets.begin());
    bullets.erase(bullets.begin());
    bullets.erase(bullets.begin());

    std::cout << "Usunąłem obiekty.\n";

//bullet_c.h
    #ifndef bullet_c_h
    #define bullet_c_h

    #include <SFML/Graphics.hpp>
    #include <string>
    #include <iostream>

    class bullet {
        sf::Vector2f pos;
        bool playerIsShooter;
        float vel;

    public:
        bullet(bool pIS, float v, sf::Vector2f p);
        ~bullet();
        bool if_pIS();
    };

    #endif

//bullet_c.cpp
    #include "bullet_c.h"

    bullet::bullet(bool pIS, float v, sf::Vector2f p): playerIsShooter(pIS), vel(v), pos(p) {
        std::cout << "Bullet at x: " << pos.x << " y: " << pos.y << " with velocity: " << vel << " created. Player is a shooter: " << playerIsShooter << "\n";
    }
    bullet::~bullet() {
        std::cout << "Bullet removed! \n";
    }

    bool bullet::if_pIS() {
        return this->playerIsShooter;
    }