Minimal Integer Set Implementation in Go

int_set.go

type int_set map[int]struct{}

func (s *int_set) Add(key int) {
	(*s)[key] = struct{}{}
}

func (s *int_set) Values() []int {
	var result []int
	for k, _ := range *s {
		result = append(result, k)
	}
	return result
}