text: #pragma once
  
  #include <SFML/Graphics.hpp>
  
  /**
   * @brief main app class
   */
  class app {
  public:
  	/**
  	 * @brief initialize app variables
  	 *
  	 */
  	app();
  
  	/**
  	 * @brief equivalent to main
  	 *
  	 * @return program exit code
  	 */
  	int run();
  
  private:
  	// main app window
  	sf::RenderWindow m_window;
  };
  