cmp

type DefaultEq[T any] struct {
	EqualImpl func(T, T) bool
}

type DefaultOrd[T any] struct {
	CompareImpl func(T, T) Ordering
}

type Eq[T any] interface {
	// Equal returns true if and only if given two arguments are the same.
	Equal(T, T) bool
}

type Ord[T any] interface {
	// Compare(x, y) returns:
	//     LT if x < y
	//     EQ if x == y
	//     GT if x > y
	Compare(T, T) Ordering

	// Lt(x, y) means x < y.
	Lt(T, T) bool

	// Le(x, y) means x <= y.
	Le(T, T) bool

	// Gt(x, y) means x > y.
	Gt(T, T) bool

	// Ge(x, y) means x >= y.
	Ge(T, T) bool

	// Eq(x, y) means x == y.
	Eq(T, T) bool

	// Ne(x, y) means x != y.
	Ne(T, T) bool
}

type Ordering int