Simple SFML Game class

main.cpp

#include <SFML/Graphics.hpp>

class Game {
private:
  // Add all your variables you need, your "globals".
  sf::RenderWindow window;
  sf::Texture texture;
  sf::Sprite sprite;
  unsigned int lives;
  // ...
public:
  // This is the constructor, called whenever a 'Game' object is created.
  // Use this to setup stuff you have to set once.
  // This should only be used for things that can't fail, to always have a defined state.
  Game() {
    lives = 0;
  }
  
  // This is the destructor, called whenever a 'Game' object is destroyed.
  ~Game() {
  }
  
  // Load and run the game
  int run() {
    // Prepare everything
    window.create(sf::VideoMode(640,480), "My SFML Game" /* ... */);
    
    // This should do some error checking as well and 'return' just in case.
    texture.loadFromFile("myImage.png");
    sprite.setTexture(texture);
  
    while (window.isOpen()) {
      // Your standard game loop here...
      // Polling events...
      sf::Event event;
      while (window.pollEvent(event)) {
        switch (event.type) {
          case sf::Event::Closing:
            window.close();
            break;
        }
      }
      
      // Updating things...
      
      // Drawing everything...
      window.clear();
      window.draw(sprite);
      window.display();
    }
    return 0;
  }
};

int main() {
  // Create a Game object and run it
  Game myGame;
  return myGame.run();
}