bad_idea.cpp

void draw_all(sf::RenderWindow &window, std::vector<sf::Sprite*> &sprites)
{
    for(auto *sprite : sprites)
        window.draw(*sprite);
}
int main()
{
    sf::RenderWindow window;
    std::vector <sf::Sprite*> gameSprites;
    // troche kodu
    while(window.isOpen())
    {
        // troche więcej kodu
        draw_all(window, gameSprites);
        window.display();
    }
    return 0;
}