text: #ifndef BOOK_RESOURCEIDENTIFIERS_HPP
  #define BOOK_RESOURCEIDENTIFIERS_HPP
  
  
  // Forward declaration of SFML classes
  namespace sf
  {
  	class Texture;
  }
  
  namespace Textures
  {
  	enum ID
  	{
  		Eagle,
  		Raptor,
  		Desert,
  		Grass,
  		Water,
  	};
  }
  
  // Forward declaration and a few type definitions
  template <typename Resource, typename Identifier>
  class ResourceHolder;
  
  typedef ResourceHolder<sf::Texture, Textures::ID> TextureHolder;
  
  #endif // BOOK_RESOURCEIDENTIFIERS_HPP
  