type PointSet set[Point]

func (p PointSet) ChessBoard() Board {
	b := NewBoard()
	for point := range p {
		b[point.Address.Index()] = point
	}
	return b
}

var TestPointSet = PointSet{
	{
		Address: {0, 1},
		Piece: &Piece{
			Kind: Pawn,
			Orientation: White,
		},
	},
	{
		Address: {4, 0},
		Piece: &Piece{
			Kind: King,
			Orientation: White,
		},
	},
	{
		Address: {4, 7},
		Piece: &Piece{
			Kind: King,
			Orientation: Black,
		},
	},
}

func addPawn() {
	TestPointSet = combine(TestPointSet, PointSet{
		{
			Address: {0, 2},
			Piece: &Piece{
				Kind: Pawn,
				Orientation: White,
			},
		},
	})
}

func addSets() {
	TestPointSet = combine(TestPointSet, set0, set1, set2, set3)
}

type Path []Point
type PathSet set[*Path] // slices cannot be compared for equality so use a pointer here

type IntSet set[int]

var TestIntSet = IntSet{0, 1, 2, 2, 3}

func reduceTestIntSet() {
	fmt.Println(TestIntSet)
	fmt.Println(reduce(TestIntSet))
}

> 3 2 1 0 2
> 0 3 2 1

func doesTestIntSetHave4() {
	fmt.Println(has(TestIntSet, 4))
}

> false

var TestIntSet2 = IntSet{3, 2, 1, 2, 0}

func areTestIntSetsEqual() {
	fmt.Println(equal(TestIntSet, TestIntSet2))
}

> true

var TestIntSet3 = IntSet{0, 1, 2, 3}

func testIntSetDifference() {
	newSet := diff(TestIntSet, TestIntSet3)
	fmt.Println(newSet)
}

> 2