gistfile1.txt

case class Resources(
  food: Food=Food(0), wood: Wood=Wood(0), stone: Stone=Stone(0), gold: Gold=Gold(0),
  mana: Mana=Mana(0)
) {
  def +(r: Resources) =
    Resources(food + r.food, wood + r.wood, stone + r.stone, gold + r.gold, mana + r.mana)
  def -(r: Resources) =
    Resources(food - r.food, wood - r.wood, stone - r.stone, gold - r.gold, mana - r.mana)
  def >=(r: Resources) =
    food >= r.food && wood >= r.wood && stone >= r.stone && gold >= r.gold && mana >= r.mana
  def <(r: Resources) = ! >=(r)

  def isZero = food.isZero && wood.isZero && stone.isZero && gold.isZero && mana.isZero
}