regex/unique_array.go

package main

// Unique array data structure
type uniq_arr[T comparable] struct {
	backingMap map[T]struct{} // Map is used to check if element exists - Empty structs occupy zero memory
}

func new_uniq_arr[T comparable]() uniq_arr[T] {
	return uniq_arr[T]{
		make(map[T]struct{}),
	}
}
func (s *uniq_arr[T]) add(vals ...T) {
	for _, item := range vals {
		if !s.contains(item) {
			s.backingMap[item] = struct{}{}
		}
	}
	return
}

func (s uniq_arr[T]) contains(val T) bool {
	_, ok := s.backingMap[val]
	return ok
}

func (s *uniq_arr[T]) delete(val T) {
	delete(s.backingMap, val)
}

func (s uniq_arr[T]) values() []T {
	toRet := make([]T, len(s.backingMap))
	i := 0
	for k := range s.backingMap {
		toRet[i] = k
		i++
	}
	return toRet
}