text: #ifndef SOURCES_SCOUT_CATEGORY_HPP_
  #define SOURCES_SCOUT_CATEGORY_HPP_
  
  namespace Category
  {
    enum Type
     {
      None             = 0,
      SceneAirLayer    = 1 << 0,
      PlayerAircraft   = 1 << 1,
      AlliedAircraft   = 1 << 2,
      EnemyAircraft    = 1 << 3,
      Pickup           = 1 << 4,
      AlliedProjectile = 1 << 5,
      EnemyProjectile  = 1 << 6,
      ParticleSystem   = 1 << 7,
      SoundEffect      = 1 << 8,
      Network          = 1 << 9,
  
      Aircraft   = PlayerAircraft | AlliedAircraft | EnemyAircraft,
      Projectile = AlliedProjectile | EnemyProjectile,
    };
  }
  
  #endif
  